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

Smith ~ Hesler

313

Stipe 3-6 cm long, 4-10 mm thick, solid, pallid within, covered over
all to near apex with fibrils paler than those of cap and leaving an apical
zone when veil breaks. Veil yellow.
Spores 7-10 x 4.5-5.5,/, smooth, ochraceous twany in KOH, apical
pore small but distinct, in face view elliptic varying more rarely to ovate
and a very few somewhat angular, in profile elliptic to obscurely inequilateral; color pale reddish tawny in Melzer's reagent or a very few spores
dark bay; wall as revived in KOH about 0.5 Fu thick.
Basidia 4-spored, 25-32 (37) x 6-8(10) F,, both 2-, and 4-spored,
clavate, hyaline in KOH, yellowish hyaline in Melzer's reagent. Pleurocystidia 50-78 X 7-12 (15) /u, basically fusoid-ventricose with flexuous
walls in neck in many, also tending to branch either in ventricose part or
above, pedicel narrow and thin-walled, neck often incrusted with amorphous material, with homogeneous content in either KOH or Melzer's
reagent, thin-walled. Cheilocystidia similar to pleurocystidia but often
smaller. Caulocystidia none.
Gill trama of hyaline subparallel hyphae 3-6,u broad, the walls
thin, hyaline in KOH, smooth, non-gelatinous, cells short to elongated
and inflating only in age; subhymenium a broad zone of narrow gelatinous interwoven hyaline hyphae, smooth, and thin-walled, the gelatinization extending to base of basidia near gill edge. Pileus cutis a poorly
formed narrow zone of subgelatinous hyphae incrusted with ochraceousbrown pigment, hyphae 3-5 a/ broad; beneath this a thick hypodermium
of nongelatinous hyphae 5-15 pt broad with rusty brown bands and
spirals of pigment. Context hyphae yellow to hyaline in KOH, walls
thin and smooth, cells inflated to 60 /t at times, mostly 10-15 /u diam.,
some bright ochraceous oleiferous hlyphae present. Clamp connections
present. All hyphae inamyloid.
HABIT, HABITAT, AND DISTRIBUTION: On decayed hardwood (Acer
rubrurn), Mud Lake Bog, Washtenaw County, Michigan. Oct. 14, 1961,
Smith 64684, type.
OBSERVATIONS: This species resembles P. graveolens but has slightly
larger spores, only a faint pleasant odor, and a very poorly developed
gelatinous pellicle. The pleurocystidia, in addition, are much more versiform in P. stratosa, and the structure of the pileus context also appears
to be different.
Stirps Spumosa
Key
1. Pileus pellicle gelatinous but thin and easily obliterated. Veil very
thin; spores with apical pore distinct (some spores obscurely truncate)......................P. baptistii
1. Not as above....................... 2