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Species Information
Summary: Features include 1) small size, 2) an orange, depressed, sulcate cap, 3) decurrent gills, 4) a stem colored as the cap, and 5) growth on liverworts.
It has been reported at least from BC (Redhead(5)). There are collections from BC at the University of British Columbia and collections from WA and AK at the University of Washington. It occurs also in Europe.
Cap: 0.3-0.6cm across, convex becoming flat with slight umbo, later umbilicate; orange-brown; buttery-shiny, smooth, +/- translucent-striate, (Breitenbach), 0.5-1.2cm across, convex, soon with slight depression; orange to rust-orange; transparently sulcate, bald, (Moser), up to 1cm across, depressed; fairly bright orange, (Courtecuisse)
Flesh: thin; orange-brown, (Breitenbach)
Gills: long-decurrent, 8-16 gills reaching stem, 1 subgill between each pair of gills, broad, some forked; white to cream; edges smooth, (Breitenbach), deeply decurrent, thin; white, then orange-hazel, (Moser), pale (Courtecuisse)
Stem: 1.5-2cm x 0.1-0.12cm, cylindric, often bent, base somewhat wider; "light cream-orange to light orange-brown, base paler to whitish"; smooth, shiny, base sometimes white-tomentose, (Breitenbach), 2-2.5cm x 0.1-0.15cm, hollow; more or less colored as cap, (Moser), up to 2.5cm long and 0.2cm wide, concolorous (but illustrations shows paler than cap), (Courtecuisse)
Odor: none (Breitenbach)
Taste: mild, insipid, (Breitenbach)
Microscopic spores: spores 7-12 x 4.7-6.6 microns, elliptic - tear-shaped, smooth, iodine-negative, colorless; basidia (2-)4-spored, 31-45 x 8-10 microns, cylindric-clavate, without basal clamp connection; pleurocystidia and cheilocystidia not seen; cap cuticle of parallel, somewhat intertwined hyphae, those in the uppermost layer 1.5-2 microns wide, deeper hyphae 2-5 microns wide, septa without clamp connections, (Breitenbach), spores (8.5)9.5-11.2 x (4.3)4.7-5.8 microns, longish, more rarely elliptic; basidia (2-)4-spored; clamp connections absent, (Moser)
Spore deposit: white (Breitenbach)
Habitat / Range
single to gregarious among vegetation of springs or in wet places, among or near Marchantia polymorpha (a liverwort), summer to fall, (Breitenbach for Europe), on living and dead thalli of Marchantia paleacea in alpine zone, (Moser for Europe), on liverworts, especially Marchantia polymorpha, (Courtecuisse for Europe)
