The North American Species of Pholiota

68. Pholiota myosotis (Fr.) Singer.

Agaricus myosotis Fries, Syst. Myc. 1: 290. 1821.
Naucoria myosotis (Fr.) Kummer, Der Führer in die Pilzkunde p. 77. 1871.
Hyalophila myosotis (Fr.) Quélet, Enchir. Fung. p. 102. 1886.
Naematoloma myosotis (Fr.) Smith, Mycologia 42: 323. 1950.
Agaricus elatior Peck, Ann. Rep. N.Y. State Mus. 39: 41. 1887.
Naucoria elatior (Pk.) Saccardo, Syll. Fung. 9: 109. 1891.

Illustrations: Text figs. 157-159; pl. 28.

Pileus (10) 15-30 (40) mm broad, broadly conic to convex, glabrous except occasionally with scattered veil remnants along the margin, edge often appendiculate, viscid to glutinous, evenly olive to olive-green or olive-bronze ("medal bronze" to "citrine"), evenly colored, opaque when young but before fading becoming brownish and striatulate, near olive-buff when faded. Context olivaceous, pliant, odor and taste not distinctive.

Lamellae broad, adnate to shallowly adnexed, subdistant, becoming ventricose, whitish at first, then pale olivaceous and finally brown from the spores, edges minutely white-fimbriate and eroded.

Stipe (6) 10-15 (20) cm long, 2-5 (7) mm thick, very rigid, equal, hollow, covered to the line formed by the broken veil by white to olivaceous veil fibrils in patches or zones, densely pruinose above.

Spore deposit dull rusty brown; spores 14-17 x 7-9 µ, inequilateral in profile, ovate in face view, ochraceous tawny in KOH, smooth or a few faintly wrinkled as revived in KOH, apex not conspicuously truncate, wall thickened to 0.75-1 µ and pale tawny in Melzer's sol.

Basidia 4-spored, 26-34 x 9-11 µ, projecting when sporulating, hyaline to yellowish in KOH. Pleurocystidia present 35-50 x 10-15 µ, fusoid-ventricose to clavate-mucronate, beaked or with several protuberances over apical region, rarely ventricose with a broadly rounded apex, as revived in KOH with an amorphous highly refractive interior body or amorphous content variously disposed. Cheilocystidia abundant, 32-50 x 6-12 µ, a mixture of leptocystidia and chrysocystidia, fusoid-ventricose to clavate-mucronate. Caulocystidia merely hyphal ends 4-9 µ wide or these narrowly clavate, variable in length.

Gill trama hyphae subparallel, pale yellow revived in KOH, cells 5-15 µ broad, walls thin so slightly thickened and smooth; subhymenium cellular and hyphal walls not gelatinous. Pileus with a tough gelatinous pellicle of narrow 3-5 µ wide hyphae with walls smooth to slightly incrusted; hypodermium yellow in KOH, hyphal cells inflated (at times up to 20 humidicola or more), the walls thin and smooth to slightly roughened as revived in KOH. Clamp connections present.

Habit, Habitat, and Distribution: Gregarious in or along the edges of bogs or on boggy soil, typically northern, and often abundant during dry seasons. Material from New York, Michigan and Washington as well as Ontario in Canada has been examined.

Observations: This is a most distinctive species by virtue of the olive to olive-bronze viscid pileus, the dull cinnamon-brown spore deposit, large spores and whitish gills. The ornamentation of the spores is not a constant feature in this species and when present is best disregarded as a generic feature.

Material Examined: MICHIGAN: Smith 33-788, 15483, 21157, 31890, 41657, 43906, 43907. NEW YORK: Smith 207, 334, 371, 553, 604; Peck's type of Agaricus elatior. WASHINGTON: Smith 2596, 16598, 40361, 40837, 40846. CANADA (ONTARIO): Smith 4015.