Agaricales » Mycenaceae » Cruentomycena

Cruentomycena viscidocruenta

Cruentomycena viscidocruenta (Cleland) R.H. Petersen & Kovalenko 2008, in Petersen et al., Mycotaxon, 105(4), 119-136. (2008).

Diagnosis: Basidiomata (Figure 1a) small, mycenoid; Pileus 4–11(–14) mm broad, plane to shallowly convex, centrally depressed or almost umbilicate, viscid to glutinous when fresh, laccate to matt when dried, rich reddish crimson, blood red, minutely rugulose, outward gently crenate, deeply striate, color red-black upon drying; margin subcrenate when fresh, sometimes appearing striate and often inrolled when dried; Lamellae subdistant, adnate with decurrent tooth to arcuate, terminating quite abruptly on stipe, thick, slightly paler than cap (rose color of Cleland) and becoming dark cinnabar to pallid gray-mauve on drying, very minutely denticulate, lamellar edges very slightly darker than lamellar face when fresh, distinctly marginate to blood red or deep purple upon drying; Stipe 6–25 mm long, 0.4–1 mm broad, terete, equal, glutinous to viscid, blood red, hollow, perhaps producing minimal blood-red juice upon bruising; base into a hemisphere or a rounded carbuncle concolorous with stipe, occasionally with superficial cinnabar tomentum. Red pigment leaching copiously in formalin (Cleland) and KOH.

Pileipellis with superficial viscid layer (with adherent spores) covering radially oriented, thin-walled (easily overlooked), unornamented hyphae 4–9 μm diam., hardly inflated, not encrusted, frequently septate and occasionally demonstrably clamped; terminal cells undifferentiated, simply rounded apically. Pileus trama of significantly inflated hyphae up to 28 μm diam., thin-walled, constricted at septa, clamped, almost pseudoparenchymatous, perhaps weakly pseudoamyloid; Basidia (Figure 1b) 20–25 × 6–8 μm, clavate, clamped, thin-walled, 4-spored; sterigmata persistent after spore discharge, awl-shaped, stiff; Basidiospores (Figure 1c) amyloid, (6.5–)8–10 × (2.5–)3–4.5 μm, thin-walled, elongate pip-shaped, tapering asymmetrically toward hilar appendage, aguttulate, hyaline. Lamellar trama irregular, of somewhat inflated cells, weakly pseudoamyloid (but difficult to distinguish from merely pink-pigmented; Cheilocystidia (Figure 1d,e) scattered along lamellar edge, dimorphic: 1) (Figure 1d) 17–42 × 11–24 μm. sphaeropedunculate to almost sessile, very thin-walled; and 2) (Figure 1e) 27–41 × 7–14 μm (at widest point), ten pin-shaped or sublecythiform with narrowed neck and slightly expanded capitulum (6–7 μm broad). Stipe surface covered with thin viscid layer; hyphae strictly parallel, thin-walled, 3.5–7 μm diam., infrequently septate, clamped; occasionally producing out-turned hyphal tips; caulocystidia (Figure 1f) somewhat inflated, 28–>75 × 8–14 μm, thin-walled, of undetermined origin; contents homogeneous, with very pale pinkish tint.

Index Fungorum Number: IF511636

 

Figure 1. Cruentomycena viscidocruenta. AD-C12334. a. Basidiome, ×6. b. Basidiospores. c. Basidia. d, e. Cheilocystidia. f. Caulocystidia. Standard bar = 10 μm for basidiospores and basidia, otherwise = 20 μm.

 

 

Reference:

Petersen, R. H., Hughes, K. W., Lickey, E. B., Kovalenko, A. E., Morozova, O. V., Psurtseva, N. V., & Morosova, O. (2008). A new genus, Cruentomycena, with Mycena viscidocruenta as the type species. Mycotaxon, 105(4), 119–136.

 

Recent Genus

Boreostereum
Boidinia
Australovuilleminia

Recent Species

Dictyocephalos attenuatus
Oliveonia fibrillosa
Tricholomella constricta