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Species Information
Summary: {See also Hemimycena Table.} Features include small size, white color, a finely striate cap, decurrent, distant, narrow gills, a thread-like stem, growth on plant debris or wood, and microscopic characters including elongate, presumably inamyloid spores. It was described by Smith in Mycena Section Albomycena.
Hemimycena subimmaculata is known from a Seattle WA 1911 collection, but also included for Denmark by Hansen, L.(2). There is a BC collection by O. Ceska at the University of British Columbia (as Hemimycena subimmacullata). There are also a number of collections by O. Ceska labeled Mycena albissima from BC (the synonymy follows Redhead).
Stem: about 2cm long and about 0.05cm wide, cylindric, hollow; white; minutely pruinose to subglabrous [almost bald], (Smith), 0.6-2.4cm x 0.025-0.07cm, (Hansen)
Microscopic spores: spores 8-11 x 3.5-4 microns, (12-14 x 4-5(6) from 2-spored basidia), subfusiform [somewhat spindle-shaped], smooth, iodine reaction not determined; pleurocystidia not observed, cheilocystidia not observed, (Smith), spores 7.5-12 x 2.5-4.5 microns, oblong to subcylindric; basidia usually 4-spored; pleurocystidia absent, cheilocystidia scattered, indistinct; pileocystidia 8-23 x 2-3.5 microns, thin-walled; caulocystidia subcylindric, thin- or thick-walled, to 70 microns long at base of stem, (Hansen)
Spore deposit: [presumably white]
Habitat / Range
cespitose [in tufts] on dead wood in woods near Seattle, (Smith), on plant debris, summer to fall, (Hansen)
Similar Species
Hemimycena albicolor has slightly narrower spores according to Redhead(15) (8.5-12 x 2-3 microns). Hemimycena albissima has abundant cheilocystidia according to Smith(1), but Redhead(15) counts H. albissima as a synonym.
