Pictorial Key to Mushrooms of the Pacific Northwest by Danny Miller,
education@psms.org
(version 2.4.1 - Please send feedback!)
Visit my sister website:
Danny's DNA Discoveries, where I
go into much more detail about all the current genetic evidence for what species
occur here, named and unnamed. This is a work in progress and only some mushroom
groups have information so far.
(returns a list of pages you must search individually)
Hover to see the definition of a category; for mobile browsers click
here.
Here is a guide to help you identify over 1,500 different mushrooms in the Pacific Northwest, an area that includes all of Washington, Oregon, Idaho and
Southwestern British Columbia. About half of these mushrooms are also widely
found across all of North America and in similar climates around the world (like Europe).
Thank you to the photographers who generously donated
their images to this project. They retain copyright protection for their work. Do not reproduce any of these photographs! This would never have been possible without the
photography of Steve Trudell, Noah Siegel, Michael Beug, Drew Parker, Paul
Kroeger, Fred Rhoades, Buck McAdoo, Adolf and Oluna Ceska, Christine Roberts,
Daniel Winkler, Bryce Kendrick, Kent Brothers, Joe Ammirati, Renée Lebeuf, Debbie Viess, Erin
Page Blanchard, Matt
Trappe, Jim Trappe, Jim Ginns, Ian Gibson, Christian Schwarz, Paul Hill, Tim
Sage, Wendy Boes,
John Davis, Marian Maxwell, Sava Krstic, Harvey and Pam Janszen, Janet Lindgren,
Jen Strongin, Derek Hevel, Shannon Adams, Dimitar Bojantchev, Brandon Matheny, Jonathan L Frank,
Alan Rockefeller, Steve Ness, Lauren Ré, Josh Powell and the libraries of Ben Woo, Kit Scates and Harley Barnhart, Joy Spurr,
Ron Pastorino, Matthew Koons, Kim Traverse, Leah Bendlin, Richard Morrison,
Jeannette Barreca, Julie Jones, Connor Dooley, Ann Goddard, Yi-Min Wang, Jacob
Kalichman, the USDA Forest Service, NAMA and the Field Museum of Natural History. Many thanks are also due to Ian Gibson for a thorough
review of everything, without whom this could not have been nearly as good as it is.
Before attempting to use this key, you must read these
instructions. Remember, the colour coding
is for scarcity, and says nothing about edibility. Don't eat
anything based on what you see here. Even edible mushrooms can kill you
if picked in the wrong spot. Every mushroom makes some people sick!
NO MUSHROOM IS SAFE FOR EVERYBODY!
To learn more about mushrooms and read all the collected
information referred to in the various pictorial pages, you might enjoy this
introduction
to mycology.
For a discussion on which mushrooms are actually related to
each other, in contrast to which ones look alike (how I have sometimes placed them in this key), read
the page on taxonomy.
GILLED MUSHROOMS - Easily confused with
veined mushrooms, like chanterelles. Remember, three important things you'll need to
know are spore colour, how the
gills attach
to the stem and where you found it. If you're not sure of the spore colour (tiny, young or dry mushrooms can
be especially difficult to spore print), you'll have to try all four colour
categories.
"Secotioid" or "Gastroid" gilled mushrooms are found on the
gastroid page. They resemble a mutated mushroom that has
partially closed up or "trufflized", with primitive remnants of a cap,
gills and stem still visible if you slice the mushroom in half. Don't bother to try
and take a spore print. Most have lost their ability to drop spores.
Choose a spore colour:
Pale Spores - mostly white, sometimes pale pink, yellow
or orange (but never mixed with brown). Very rarely red or green (Melanophyllum
or Chlorophyllum).
Pinkish Salmon Spores - usually darker than the pale pink spores
of the pale spored group.
Warm Brown Spores -
never very dark, but light to medium brown, with warm
tones like yellow or orange mixed in - or just plain brown! Milk chocolate, but
not dark chocolate. All with attached gills.
Cold, Dark Spores - cold, dark colours like dark chocolate, grey or black,
often with a tinge of purple.
Pale Spores - for
yellow to orange spores, first try Russula or
(if it bleeds),
Lactarius. For pale pink, start with
Rhodocollybia or
Macrocystidia. For free gills,
try Amanitaceae and Lepiota first. Otherwise, I'm
sorry, but this is the most numerous and confusing group of mushrooms in
this key. Keep reading.
Here are the most interesting and distinctiveclades of related pale spored
mushrooms. While related mushrooms don't necessarily look alike (and vice
versa), these groups are a pleasant exception. I often find that it helps to run
down this list in my mind thinking "Are you sure it couldn't be..." before
considering the stature type groups that follow.
Russula
- easily recognized stature (browse the photos to see what they have in
common)
entirely white when young
except
cap cuticle usually coloured
and stem sometimes flushed reddish.
brittle (they do not fray when broken and the stem can snap audibly like
a piece of chalk, a quality shared only by Lactarius).
all parts may stain brown, red or black, and the gills may
turn yellow to orange from the spores.
Russula and Lactarius are not related to other gilled mushrooms. Microscopically, the spores are round with
warts and ridges that turn black in iodine.
Russulales - Russula
Lactarius - if you break
the gills of a fresh Lactarius, white or coloured milk will bleed out.
they are also
brittle textured like the related Russula, so their stems can break like
chalk.
unfortunately more variable in stature
than Russula, but you can learn to recognize one on sight with a
certain sixth sense. Try here as a last resort for an old mushroom that has
stopped milking. Focus on if the stem can be cleanly broken.
Russulales - Lactarius
Waxy Caps
- gills are often thick and widely spaced and look
like they are made of wax (often the whole mushroom does).
the caps are
often viscid and brightly coloured; even the plain white
or brown mushrooms are an interesting pastel shade.
This can be subtle and difficult to detect. You might need practice to
recognize some of these.
gills never free, and often decurrent. Only occasionally
hygrophanous. Partial veil unusual. Only
occasionally on wood.
microscopically, the basidia are at least 5 times
longer than the spores.
(most often confused with
Laccaria which are always orange or purple with
tough, fibrous stems, and the colourful
Mycenas, which are not waxy and have much thinner, delicate stems).
Amanitaceae -
elegant stature, free gills
(but unfortunately they don't usually look free, so this group can be
difficult to recognize and will take practice).
may have
a volva of
some kind at the bottom of the stem (sac, rings or collar).
may have warts
or patches
on the cap that are
easily removable, or just be surrounded by cottony fluff or a
layer of slime when young. Lepiota scales are
not removable. You may need to check that section too for mushrooms without
scales.
Amanita is dry capped (and never
hygrophanous), but the rare
Limacella is usually completely slimy and difficult to recognize! With or without
a partial veil. Found on the ground.
dry cap that is not hygrophanous, strongly
decurrent gills, no
partial
veil and orange colours (often with white or brown).
Usually found on the ground.
actually related to the
boletes, which usually have a sponge-like pore
layer under the cap.
(often mistaken for a chanterelle,
which has veins, not true gills. Also like
Paralepista flaccida,
whose gills are
not as bright).
Boletales - Hygrophoropsis
Once you have eliminated these special groups (that
you will eventually learn to recognize) things get a little more difficult, as
the other major clades of related mushrooms are not quite as distinctive.
Unfortunately, many different mushrooms evolved to look kind of the same. We will now sort the
mushrooms by stature types (sorted by shape and size,
not by actual related groups).
This is probably the most difficult section of the key! You will
likely need to try more than one group to find your mushroom.
Oddball mushrooms -
This section contains oyster mushrooms, which usually grow on wood typically having
no stem or a stem that is stubby and eccentric (sticking out to one side).
The gills may look odd, too.
Also found here are
wood-inhabiting, mostly
non-hygrophanous mushrooms with either serrated gill edges
or tough fruitbodies. That may not seem
odd to you, but their relationship to other mushrooms turns out to be very
odd!
Also found here are mushrooms
with poorly
developed gills that mostly grow on moss.
Mycenoid -
small (usually <2.5cm
but sometimes larger), fragile, often
conical capped
when young, with no
partial veil.
stems never tough, wiry, nor coloured darker than the caps; they break easily. Usually with fairly closely spaced gills for such a small mushroom.
found on ground or wood.
Sometimes colourful. Viscid or dry. Often but not
always hygrophanous.Gills
usually attached but separate from the stem easily.
gills may be arcuate decurrent, but caps won't be umbilicate (unlike
omphalinoid).
older
specimens without the conical cap are very easily confused with
marasmioid or
collybioid
mushrooms. Some Galerina and
Psathyrella may be very similar
but have dark spore prints.
Marasmioid - usually small,
slender mushrooms (<2.5cm) with the most common one getting
larger, with tough, cartilaginous, wiry or dark stems
difficult to crush. A garlic or putrid odor might indicate this group
(or collybioid).
fewwidely spaced gills (unlike some
mycenoid and collybioid species, which they
are easily confused with).
flatter shaped
young cap than the often conical mycenoids.
gills attached, found on the ground or on wood.
Dry capped. No
partial veil.
Collybioid - small
to medium sized mushrooms
(1-10cm but occasionally 15cm or more) with convex to flat caps
mostly with adnexed (to adnate)
gills, gills often more closely spaced than
marasmioids.
on
the ground, debris, cones or other mushrooms. Mushrooms
normally growing on wood may appear to be coming from the ground, so if you
can't find it here, check the wood inhabiting
section too.
marasmioids are similar, so if you don't find your mushroom here, try there. Some
mycenoid species are not very conical and very
similar too. Decurrent gills are much more common on those pages than here.
mushrooms with adnate gills overlap with clitocyboids
- try the smaller ones (<10cm) here first and the larger ones there.
Clitocyboid - medium to large mushrooms
(>2.5cm), caps not conical.
with decurrent (to adnate)
gills, those with umbilicate caps are usually larger than the
omphalinoid group.
mushrooms with adnate gills overlap with collybioid
- try the smaller ones (<10cm)
there first and the larger
ones here.
found mostly on the ground. Mushrooms normally growing on wood
may appear to be coming from the ground, so if you can't find it here, check
the wood inhabiting section too.
(mushrooms
<5cm with a scaly/shaggy stem, or >5cm with a shaggy stem may be on the
Lepiota page).
Tricholomatineae - Tricholoma
Wood Inhabiting
- small to large, meeting the criteria for either collybioid or
clitocyboid. Other stature types with
wood inhabiting mushrooms have them included on their page. Caps usually >2.5cm,
but growing on wood. The wood may be buried in the ground,
so try this category if you can't find your terrestrial mushroom elsewhere.
Many things sometimes grow on wood, so you may have to check the
collybioid
and clitocyboid pages too.
(Tough mushrooms and those with serrated gill edges are
oddballs. This can be subtle, so try that page
for anything >2.5cm and decurrent gills if you can't find it here).
Gilled Boletes
- four distinctive mushrooms, including 2 of the "oysters" found above, are
related to the boletes.
1. decurrent
gills and a strongly inrolled cap margin, usually under birch.
2. a large velvet stemmed "oyster" with an off centre stem, on
wood.
3. a stemless
"oyster" on wood with wavy gills
4. like a bolete
with bright yellow gills and possibly staining blue, on the
ground.
in common: dry caps, no partial veil. Admittedly, other mushrooms share all these
traits, but examine and eliminate this group before spending time in the next categories.
Boletales - (Paxillus, Tapinella, Phylloporus)
Cortinarius
-
often with rusty orange-brown spores, growing on the ground.
the partial
veil is often a cortina
(cob-web like and rarely elastic) instead of a flap of skin (with one important exception you
need to learn) although other brown and dark spored genera may also have cortinas.
when the spores are ordinary brown, they could be mistaken for the
"Medium/Large
terrestrial" category, below. The smallest ones could also be mistaken for "LBMs",
also below.
Cortinariaceae (Cortinarius)
Gymnopilus
- rusty orange-brown spores, found on wood, bitter
tasting.
small to large usually orange-brown fruitbodies, dry
capped. With or without a partial veil.
Hymenogastraceae p.p.? (Gymnopilus)
Medium to Large Terrestrial - (>2.5cm),
found on ground (or wood chips) that is not burnt. Regular brown spores.
with veil (cortinate
or fleshy) or not, cap viscid or not, scaly or not.
some dry capped species may be found on wood. The
smaller ones overlap in size with the "LBMs", below. Some
Cortinarius, above, have spores that are ordinary brown, and might be confused with
this group.
LBMs - the smallest
brown spored mushrooms (mostly <2.5cm but some are larger), containing the
genera most known for small and delicate fruit bodies.
if it doesn't
fit into a previous category try here - most features are quite variable. Found on the ground or on wood,
cap
viscid or dry,
hygrophanous or not, gills free to decurrent.
the larger ones
overlap in size with the previous two groups, which may have small mushrooms
but typically have stockier stems or larger relatives. But do check the
other appropriate page
(terrestrial or on wood) as well.
Gilled Boletes
- separated from the others by being strongly
decurrent and secondarily, either
looking like a tent spike or being slimy and often having a yellow stem
base.
found on the ground.
Boletales (Gomphidius, Chroogomphus)
Agaricus-
free gills, dark chocolate
spores (but pink gills can fool you), often
with a ring on the stem.
dry caps, often large or at least stocky, found on the ground either in forests or in
grass.
most look like a button mushroom or Portobello, because those popular store bought mushrooms
are in fact one of these.
Agaricaceae p.p. (Agaricus)
Inky Caps -
Black spores, cap sometimes umbrella
shaped when young (at least as tall as they are wide).
caps often but not always
turning to ink before they can rot, sometimes within hours.
often strongly striate,
sometimes only this separates them from Psathyrella, next.
On wood, ground, grass or
dung, often very fragile with white stems.
not hygrophanous, dry caps, attached
gills usually crowded together, sometimes seceding or breaking away to look
free.
The Basidiomycota phyla groups are grouped for
convenience by shape and size, and do not necessarily represent related groups of
mushrooms. The Ascomycota phyla groups roughly represent different classes
(or sections of a class) that are related to each other.
Boletes - These mushrooms
have a cap and stem like gilled mushrooms, but sponge-like pores
underneath the cap.
they are usually soft enough to chew, and the pores
can be separated from the cap easily, unlike in the polypores.
"Secotioid" or "Gastroid" boletes are found on the gastroid page. They resemble a
mutated mushroom that has partially closed up or "trufflized",
with primitive remnants of a cap, pores and stem still visible if you slice the
mushroom in half.
Polypores -
often hard or tough mushrooms that you
wouldn't want to chew on.
usually with a sponge-like pore surface,
occasionally under a cap from a stemmed mushroom growing from the ground, but most
often attached to wood, usually without a stem and sometimes without a cap
(just pores lying flat on wood).
the pores cannot be easily removed from the rest of the mushroom unlike
the boletes (if
there is a rest of the mushroom).
some stemless species on wood have odd shaped
pores elongated like gills or maze-like or sometimes even teeth.
A toothed mushroom is a cluster of spines
or individual teeth, not growing flat on wood with teeth on its surface. Crusts have at most a wrinkled surface or teeth at
most 3mm tall.
Crusts
(Basidiomycota) - these simply grow flat on
wood (or occasionally stems or leaves) as a resupinate crust possibly with a primitive cap that bends
away from the wood.
with either no relief at all, a wrinkled surface
or small teeth (<3mm) embedded in the surface, but never quite as developed as true
polypores.
not covered in pimples (look carefully!), nor
growing on mushrooms or insects or wheat (those are covered next).
rubbery blobs on wood that are not brittle are
jellies.
smooth-ish whitish crusts are probably
the most difficult of all the groups to identify.
Crusts (Ascomycota) - usually a
hard crust or a fuzzy mold covered in pimples (very small, best seen with a hand lens), because the spores only grow in clusters
inside each pimple, but nowhere else.
usually growing on wood, other mushrooms or even insects!
If it's not growing on wood, try here, even if you can't see the pimples.
Sordariomycetes, Dothideomycetes
Toothed - with teeth or spines
underneath the cap, but sometimes they are just a mass of spines
without a cap or stem.
they hang down like icicles, whereas clubs grow upwards.
Clusters of spines or individual teeth growing out of wood that are not
jelly-like belong here. Tooth-like pores or bumps
growing out of a flat surface growing on wood belong in
crusts.
Veined - Chanterelles and similar looking
mushrooms, these are often mistaken for regular cap and stemgilled mushrooms, but the
"gills" are blunter and thicker, more like speed bumps than blades
and usually not as deep.
sometimes the undersurface of the cap is almost completely smooth. Found on the
ground.
stemless veined surfaces growing on wood are crusts. Tiny
smooth or veined mushrooms growing on moss are duplicated here and in the oddballs.
Bird's Nests - You'll recognize most of these
on sight, because they really do often look like little bird's nests
filled with one or more "eggs". After the eggs have splashed out, they
may resemble other cups!
growing on wood, debris, soil or
dung.
their identity may be hidden by the nest being covered by a lid
when young, and sometimes they are just a tiny cushion, not recognizable
until you poke them open and find one or more "eggs" inside.
Clubs (Basidiomycota) - these mushrooms have a regular brittle mushroom
texture but are simple club-shaped cylinders (or very occasionally branched) growing up from the
ground or pieces of wood.
they
are usually uniformly shaped and colourful (not black and white).
they do not have any part that
can be clearly differentiated as the "head" (although they may thicken
towards the top or experience a colour change), unless they are very slender
(<1mm). Nor are they covered in pimples. (These exceptions are
covered next).
(if they are short and small on
wood and have the texture of rubber they might be a jelly, or if they are
small and grow densely forming a flat covering on wood they might be a
crust. The
teeth of toothed mushrooms resemble clubs but they hang down like
icicles).
Clubs - Stinkhorns (Basidiomycota) -
either club shaped or
elaborately shaped, hatching out of "eggs" and getting their name
from the stinky slime they are coated in that attracts flies to spread
their spores.
rare and interesting, found on and under ground.
Some morels and relatives look similar, but do not
hatch out of "eggs".
Clubs - Earth Tongues (Ascomycota) - usually have a differentiated head of some sort
(at least a little bit more than just a colour change or a thickening) and are
not very slender (>1mm), and are not covered in pimples (those
are next).
the head is not a cup or disc shape (those are found under Cups), but convex,
rounded
or flattened vertically and not usually as complex as a morel or false
morel.
Clubs - Flasks
(Ascomycota) - usually covered in pimples (very small, best seen
with a hand lens) but one common species is not, but is black and white
with occasional branches.
they grow on wood, other mushrooms or even insects!
Sordariomycetes
Corals - More complicated shapes than the club
mushrooms, sometimes highly branched and looking more like sea coral than
a mushroom. (Very occasional branching might still be considered a club).
usually each branch is a club-like tube, but sometimes they are
flattened, with no real texture to either side of the "leaf".
brittle (not rubbery, those are jellies) and usually
found on the ground, but sometimes
on wood.
(never found on other mushrooms or animals - those are
flasks).
Puffballs and Earthstars -
these mushrooms are like little balls with the spores growing inside a closed
shape, perhaps with an outler layer opening up like rays of a
starfish, and rarely with a stem.
they grow above ground, and the inside usually starts out soft
and white like a marshmallow, becoming dark and powdery in age.
Basidiomycota,
Glomeromycota and Zygomycota species are those that are not
a uniform texture inside, or if
they are, they are porous and spongy or gelatinous.
Ascomycota have uniform interiors that are either
solid and marbled, empty, chambered or gooey.
Morels and False Morels - (Ascomycota) -
a highly prized groups of
mushrooms, the morels (as well as the false morels) have very interesting shapes, a kind
of a "brain or saddle on a stick" look about them with a complex well defined head.
(the earth tongues
have a flattened or convex head not quite as complicated, the large cups
with a stem have a cup for a head, and the similar
stinkhorns hatch out of an "egg").
Pezizomycetes p.p.
Large Cups (Ascomycota) -
this category
is for relatively brittle mushrooms with or without a stem that are shaped like cups or
saucers (concave to flat) or sometimes convex cushions (if they are
stemless).
wiggly, rubbery cups on wood are jellies.
Tiny cups at first filled with what looks like one or more bird's eggs are
bird's nests. (Old specimens will be
missing the eggs)!
these may or may not have a stem. If there is a stem, the cap is
not convex (those are
found in the earth tongues).
almost every
mushroom of this shape whose cup is >1cm in width is in this category,
smaller ones are below.
they can be separated macroscopically from the very similar unrelated
inoperculate cups below by the fact that they are rarely found
on wood or plant
debris; they are found on dung,burnt
ground, burnt wood, moss or the ground.
tiny, hairy cups at first filled with one or more "bird's eggs" are
bird's nests. (Old specimens will be
missing the eggs)!
if the cap is convex instead of concave or
plane and there is a stem, see the earth tongues
instead.
also included are the few small Basidiomycota on moss that more
resemble cups than they do any of the other Basidiomycota categories.