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Summary: Section Lactipedes (Smith), Section Sanguinolentae (Maas Geesteranus); characterized by dark reddish-brown to dark purplish brown to orange-brown cap, marginate gills, stem of same color that has white hairs at base and exudes a dark red juice when broken, and gregarious or tufted growth on leaf mold and needles; Smith described Mycena subsanguinolenta which compared to M. sanguinolenta has more pronounced yellowish colors of cap, stem, and juice, and has smaller spores and no pleurocystidia, but Maas Geesteranus points out that M. sanguinolenta can have these colors in Europe, the spore size difference is questionable in the holotype, and M. sanguinolenta often has few or no pleurocystidia, his concept therefore includes M. subsanguinolenta; Smith examined collections from BC, WA, OR, and also MD, MI, NY, TN, and gives distributions as from ME to WA and south to NC and CA in the US and from NS to BC in Canada, (as well as WA, OR, and CA for M. subsanguinolenta), Maas Geesteranus notes known from Europe, North America, and Japan; Breitenbach(3) includes also North Africa and Australia
Cap: 0.3-1.5(2.5)cm across, conic to bell-shaped or sometimes convex when old; color variable: some shade of pale reddish brown to bright reddish brown to orange-brown, etc., margin often vinaceous; smooth, not viscid, margin often furrowed at maturity, (Arora), 0.3-1(2.5)cm across, either convex or conic when young, becoming broadly convex or bell-shaped, "not expanding completely, margin appressed when young"; "color variable but always some shade of bright or dull reddish brown with a more or less vinaceous to avellaneous margin"; moist, at first with dense grayish hoary-pruinose coating, becoming bald, margin opaque or slightly striatulate, soon becoming sulcate [grooved], (Smith), 0.7-1.8cm across, parabolic or more conic to bell-shaped, with or without umbo; "dark red-brown, dark purplish brown to almost violet-brown when young", the center long remaining dark, paler further out, dingy pale brown, pale gray-brown, paler or darker flesh-color, the extreme margin frequently dark red-brown to purplish brown; dry but slightly lubricous when wet, delicately pruinose, becoming bald, more or less shallowly sulcate [grooved], translucent-striate, (Maas Geesteranus)
Flesh: thin; "reddish, exuding a dark red juice when cut", (Arora), thin, not very fragile; "sordid reddish, exuding a reddish juice when cut", (Smith), thin; dingy brownish, (Maas Geesteranus)
Gills: attached (typically adnate), well-spaced; "pallid or tinged flesh-color or reddish", edges dark reddish brown, (Arora), "adnate or slightly toothed, subdistant to distant, narrow to moderately broad"; "sordid reddish to grayish, the edges very dark reddish brown and even", (Smith), adnate, ascending, more or less decurrent with short tooth, 13-21 reaching stem, up to 0.1cm broad, somewhat ventricose [broader in middle]; "at first whitish, gradually turning pale dingy pink, pale brownish pink, pale purplish", the edge "dark red-brown, purplish brown, violet-brown"; smooth to faintly ribbed becoming dorsally interveined, (Maas Geesteranus)
Stem: 2-7.5cm x 0.1-0.2cm, "equal, hollow, fragile"; more or less cap-colored; smooth, "base with white hairs and exuding a dark red juice when broken or squeezed", (Arora), 2-6(7)cm x 0.1-0.15cm, "equal, tubular, fragile"; drab-pruinose becoming polished and more or less cap-colored; base with white hairs; exuding a bright or dull red juice when cut or broken, (Smith), 3-10cm x 0.05-0.15cm, equal for the greater part, hollow, round in cross-section, straight or curved in lower part, fragile to firm, the base at times somewhat rooting; brownish violet, brownish purple, very dark red-brown, darker or paler dingy flesh-color, paler in upper part, darker in lower part; smooth, innately fibrillose, sparsely purplish-puberulous [finely downy] all over, becoming bald for the greater part, "exuding a brownish red fluid when cut", base "more or less densely covered with long, coarse, woolly, whitish fibrils which turn reddish brown in the herbarium", (Maas Geesteranus)
Odor: mild (Arora), not distinctive (Smith), indistinct or radish-like, (Maas Geesteranus)
Taste: not distinctive (Smith)
Microscopic spores: spores 8-11 x 4-6 microns, elliptic, smooth, weakly amyloid, cystidia present on gill faces and edges, (Arora), spores 8-10(11) x 4-5(6) microns, subelliptic (somewhat elliptic), only weakly amyloid; basidia 4-spored, occasionally 2-spored or 3-spored, pleurocystidia rare to scattered or sometimes quite abundant, 36-54 x 8-13 microns, narrowly to broadly fusoid-ventricose, filled with a sordid reddish substance, cheilocystidia abundant, similar to pleurocystidia or shorter and wider, (Smith), spores 8.1-10.0(11.0) x 5.4-5.8 microns, "pip-shaped, smooth, amyloid"; basidia 4-spored, 27-35 x 8-10 microns, clavate, clamped; pleurocystidia similar if present to cheilocystidia; cheilocystidia forming a sterile band, 27-55 x 6.5-10 microns, formed at the end of densely compacted vascular hyphae, "generally fusiform, simple and smooth, with reddish brown contents", clamped (but clamp connections difficult to see), apically narrowed into acute-tipped neck, but occasionally with 2 necks or with coarse lateral excrescences; hyphae of the cortical layer of the stem 1-3.5 microns wide, clamped, fairly sparsely covered with simple to forked cylindrical excrescences 1.8-4.5 x 1-2 microns, the terminal cells (caulocystidia) solitary to clustered, 18-55 x 5.5-9 microns, cystidia-like, (Maas Geesteranus)
Spore deposit: white (Arora)
Habitat / Range
single or widely scattered to gregarious or in tufts "on leaf mold and needles in woods or at their edges", (Arora), gregarious on leaf mold, moss beds, or needle carpets, spring and fall, (Smith), scattered or in small groups, more rarely subfasciculate [almost bundled], on "humus and vegetable debris among grass and moss, on fallen twigs and moss-covered trunks of deciduous trees, among fallen needles of coniferous trees" (Juniperus, Pinus), more rarely even on decayed Pinus cones, (Maas Geesteranus), fall (Buczacki)
Mycena haematopus grows on decaying logs and stumps (mostly hardwoods), has a sterile band of marginal tissue on cap, and color is somewhat different, (Mycena sanguinolenta grows on leaf mold and needles and lacks the sterile band of marginal tissue on cap), (Arora), the best feature differentiating Mycena haematopus from Mycena sanguinolenta is the shape of the caulocystidia which remains independent of the age of the fungus, (Maas Geesteranus)
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC:
Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for
Advanced Spatial Analysis, Department of Geography, University of British
Columbia, Vancouver. [Accessed:
2020-07-11 11:30:58 AM
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