The North American Species of Pholiota

69. Pholiota humidicola (Murr.) comb. nov.

Naucoria humidicola Murrill, North Amer. Fl. 10: 174. 1917.
Naematoloma humidicola (Murr.) Smith, Mycologia 40: 693. 1948.

Illustrations: Text figs. 160-161.

Pileus 10-20 mm broad, obtuse to convex and when young the margin incurved, expanding to broadly convex or plane, at times the margin remaining decurved, surface glabrous, moist, dull cinnamon to orange-tawny on disc ("Sayal-brown" to brighter), margin ochraceous and gradually becoming paler, in age more or less olivaceous ("Isabella-color" to more olive). Context thin, pliant, yellowish, odor none.

Lamellae broadly adnate and in age with a decurrent tooth, subdistant, very broad, pallid to dingy pale yellow, drying dingy tawny to clay color, edges white-fimbriate but even.

Stipe 4-6 cm long, 1.5-2.5 mm thick, equal, cartilaginous, pallid to sordid yellow above, soon dull rusty brown below, thinly appressed-fibrillose to glabrous, apex pruinose, base surrounded by white mycelium.

Spores 9-11 x 5.5-6.3 µ, ovate to elliptic in face view, elliptic to slightly inequilateral in profile, smooth, pale tawny in KOH and very slightly redder in Melzer's, apical pore small and apex only obscurely truncate, wall about 0.5 µ thick.

Basidia 23-27 x 5-6.5 µ, 4-spored, clavate to subcylindric, hyaline to yellow in KOH. Pleurocystidia 44-58 (64) x 8-12 µ, scattered, fusoid-ventricose to narrowly clavate-mucronate, projecting beyond the basidia, usually with the refractive content of chrysocystidia. Cheilocystidia 24-32 x 5-8 µ, ventricose to subcylindric, hyaline, content homogeneous, thin-walled, abundant.

Gill trama subparallel, the cells equal in width throughout their length, pale yellow in KOH; subhymenium cellular but very thin and indistinct. Pileus epicutis a thin pellicle of narrow gelatinous hyphae 2.5-4 µ diam.; hypodermium of enlarged cells, yellow in KOH like hyphae of the context. Clamp connections present.

Habit, Habitat, and Distribution: Solitary to scattered on moss in conifer forests, New York, Idaho, Washington and Oregon: Smith 24133, 23160, and 24477 from Oregon, Smith 71086 from Idaho, and Imshaug 987 and 994 from Washington in addition to the type of Naucoria humidicola have been examined.

Observations: This species differs from P. elongata in having a gelatinous pellicle over the pileus and in the longer pleurocystidia, in fact the latter are unusually long for chrysocystidia.