The North American species of Pholiota, by Alexander H. Smith and L. R. Hesler.

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The North American Species of Pholiota

Douglas fir stumps, Olympic National Park, Washington, Smith 18003,
type.
OBSERVATIONS: This species is most closely related to Naematoloma
radicosum from which it differs in the color of the spore deposit, and
since the latter is yellow-brown the species is logically classified here. It
is possible that some descriptions of the old Flammula amara apply to
this species. Although the gills when mature in N. radicosum are dull
rusty brown, the color of the spores in deposit is in the purple-brown
spectrum.
Stirps Subochracea
Key
1. Pileus and stipe blue becoming olivaceous and fading to dingy buff............................................................................................... P. s u b c a e r le a
1. Not as above.....................
2. Pileus olivaceous on margin, gills yellow before spores mature;
stipe coarsely fibrillose-squamulose near base............. P. burkei
2. N o t a s a b o v e...................................................................................... 3
3. Spores 5-6 X 2.5-3........................................................ P. subochracea
3. S p o res 6 -8 (9) X 3 -5.......................................................................... 4
4. Stipe with a distinct pseudorhiza; taste bitter............................................................................................................................ P. olympiana
4. N ot as above........................................................... 5
5. Stipe slender (up to 3.5 mm thick)...........................
5. Stipe thicker (3-15 mm thick).............
6. Pileus dull reddish brown on disc, grayish brown over marginal
area.................................................. P. subgelatin osa
6. Pileus ferruginous to ochraceous........................................
7. Lamellae broad; subhymenium not gelatinous..................P. parvula
7. Lamellae narrow; subhymenium gelatinous..................................8
8. Pileus with a prominent umbo; stipe lacking tawny mycelium
around the base of the stipe..................................... see P. prolixa
8. Pileus merely broadly convex; tawny mycelium present at stipe
base.......................................... P. p usilla
9. Pileus disc distinctly rosy brow nish.................................................... 10
9. P ileus not colored as above............................................................... 11
10. Lamellae narrow; stipe squamulose......... see P. angustifolia
10. Lamellae broad; stipe merely fibrillose................... P. ornatula
11. Odor of honey; pileus honey-yellow.............................. P. melliodora
11. N o t as ab o v e.......................................................................................... 12
12. Pileus white to pallid when young, typically yellowing as it
matures or in one variant becoming avellaneous................. 13
12. Pileus more highly colored when young.................................14
13. Vesiculose-pedicellate pleurocystidia with bright ochraceous content