The North American Species of Pholiota

97. Pholiota kodiakensis sp. nov.

Illustrations: Text figs. 218-221.

Pileus 3.0-8.0 cm latius, late convexus, siccus, squamulosus; squamulae minutae; fulvus vel luteofulvus, ad marginem appendiculatus. Contextus pallidus, fragrans. Lamellae pallide luteae demum sulbfulvae, confertae, latae. Stipes 5.0-10.0 cm longus, 7-10 mm crassus, sursum subluteus et sericeus, deorsum squarroso-squamosus, intus pallide luteus. Sporae 5-6 x 3-3.5 µ. Pleuro-chrysocystidia 30-55 x 8-14 µ; pleuro-leptocystidia 23-40 x 5-11 µ, subclavata, vel subfusoide ventricosa. Specimen typicum in Herb. Univ. of Mich. conservatum est; legit prope Kodiak, Alaska, 27 Juli, 1964. Wells and Kempton no. 2.

Pileus 30-80 mm broad when expanded, convex at first with margin incurved, becoming nearly plane, surface dry and unpolished, with small squarrose scales overall in buttons, scales becoming separated and more appressed as pileus expands, in age often present only over the disc, margin at times decorated with veil remnants, colors tawny to orange ("raw sienna" to "raw umber"), becoming paler to nearly buff on margin at maturity. Context pallid to ivory, unchanging, thick in the disc, odor slight but fruity, taste mild.

Lamellae pale yellow in buttons, slowly becoming rusty brown, adnexed, close, moderately broad, (±5 mm), edges concolorous and entire to slightly eroded.

Stipe 50-100 mm long, 7-10 mm broad at apex, equal, concolorous with pileus below, pale yellowish to tan at apex, silky fibrillose above veil line, squarrose scaly at first below. Veil material concolorous with scales on pileus; pale yellowish within above, paler downward at times. Annular zone on stipe from broken veil distinct.

Spore deposit rusty brown. Spores 5-6 x 3-3.5 µ, smooth, germ pore distinct and apex obscurely truncate in many; shape in face view ovate to elliptic, in profile slightly bean-shaped to subelliptic; in KOH ochraceous to tawny, paler in Melzer's reagent; wall about 0.3 µ thick.

Basidia 4-spored 18-26 x 3.5-5 µ, narrowly clavate, hyaline to ochraceous in KOH and Melzer's reagent. Pleurocystidia of two types: 1) clavate-mucronate to fusoid, 30-55 x 8-14 µ, wall thin, smooth, hyaline to yellowish, content with an inclusion of amorphous highly refractive material, hyaline to ochraceous in KOH and Melzer's reagent. 2) 23-40 x 5-11 µ, subclavate to subfusoid, thin-walled, smooth, content homogeneous (no refractive inclusion), both types intergrading in that some show refractive granular material not organized into a solid inclusion. Cheilocystidia 22-33 x 4-7 µ, similar to pleurocystidia (both types), some merely narrowly clavate to fusoid-ventricose, content yellowish to hyaline and homogeneous. Caulocystidia none found (from examination of dried material).

Gill trama with a central area of floccose hyphae with greatly inflated cells (to 25 µ), subparallel at first, then somewhat interwoven, hyphal walls thin smooth and ochraceous to hyaline; subhymenium a thin layer of interwoven somewhat gelatinous narrow hyphae, hyaline in KOH. Pileus cutis an interwoven layer of non-gelatinous hyphae 3-10 µ broad, smooth or incrusted and layer reddish fulvous in KOH. Context hyphae paler and ochraceous, smooth and thin-walled, cells greatly inflated. Clamp connections present and very prominent. All hyphae inamyloid.

Habit, Habitat, and Distribution: Caespitose on soil along a road among grasses, Wondy Island, Kodiak, Alaska. July 27, 1964. Wells and Kempton, no. 2.

Observations: The dry pileus, minute spores, prominent chrysocystidia and less conspicuous clavate hymenial cystidia with homogeneous content, scaly stipe and pale yellow lamellae are distinctive. The scales of both cap and stipe are very fine and do not show conspicuously on dried specimens as they do in P. squarrosa and P. squarrosoides.