Summary: Mycenella nodulosa was described by Smith as Mycena nodulosa A.H. Sm. (Section Nodulosae), but Singer (1975) says Mycenella probably includes this species. It is distinguished by the combination of a rooting stem, reddish stains on the gills, round, spiny, inamyloid spores, and a palisade layer forming the cuticle of the cap.
Mycenella nodulosa was found on the Olympic Peninsula in WA (Smith). It was reported from BC (Redhead(5) p.7, as Mycenella nodulosa (A.H. Sm.) Vellinga).
Cap: 1-3.5cm across, obtusely conic, becoming bell-shaped or expanded and with a conic umbo, margin appressed against stem when young; fuscous to black on umbo, dark or light gray toward margin, fading to pallid dingy gray; at first hoary because of numerous projecting cystidia (finely downy under lens), soon bald, striate to disc when moist
Flesh: thin, soft, pliant; pale fuscous, "in extreme age sometimes staining reddish brown"
Gills: "deeply adnexed to broadly rounded and depressed-adnate, moderately close", 27-33 reaching stem, broad (0.5cm); "whitish to glaucous gray and densely pruinose under a lens from cystidia", spotted reddish brown when old
Stem: 6-8cm x (0.1)0.2-0.3cm, with a pseudorhiza 4-8cm long, "pliant, hollow, with a sharply differentiated cartilaginous rind"; fuscous at first, becoming pale gray to whitish in upper part; evenly covered with a white-pruinose-downy layer of colorless cystidia
Odor: not distinctive
Microscopic spores: spores 6-7 microns in diameter, round, with aculei 2-3 x 0.5-2 microns scattered over the surface, inamyloid; basidia 4-spored, 28-34 x 7-8 microns; "cheilocystidia and pleurocystidia similar and abundant", 60-80 x 10-14 microns, "unbranched, fusoid-ventricose with a greatly elongated neck", tops usually incrusted, cap cuticle a palisade layer of clavate basidium-like or contorted cells 18-22 x 5-9 microns but difficult to demonstrate in dried material
Spore deposit: [presumably white]
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