On the type of Coprinus alutaceivelatus Van De Bogart
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Original description
Coprinus alutaceivelatus Van De Bogart in Mycotaxon 8: 270. 1979 (The genus Coprinus in Western North America, part 2: sect. Lanatuli).
Holotype: North America: state Washington, Seattle, 20 Oct. 1973, F. Van De Bogart 2516 (WTU).
Pileus at first glandiform, then conical, then campanulate. Prior to expansion 1.0-2.0 cm in length and after expansion 1.7-2.9 cm in breadth. At first tan from universal veil tissue, apex under veil medium brown, with maturity pileus yellow-brown under the tan veil and apex brown under the veil remnants. Surface covered at first then plicate-striate under small felt-like irregular veil remnants. Flesh thin and membranous. Stipe hollow, no mycelial web or thread present, very thin and slightly tapered towards the apex, 1.0-2.5 cm x 2.0-3.0 mm, white, opaque, surface glabrous and silky, faint annular or volval ring present at the base, flesh moderately thick and fibrous. Lamellae lanceolate, lamellulae very numerous, 0.8-12.5 x 1.0-3.0 mm, at first very crowded, then less so. White, then brownish black, finally soot black. Autolysis complete. Odor none. Taste not observed.
Spores ellipsoidal, mostly round in cross-section, a few slightly flattened, 8.7-11.3 x 6.2-8.8 x 6.2-7.5 µm, lacking a perisporium, apiculus of medium size and usully visible, germ pore eccentric, 1.2 µm diameter. Color en masse soot black, microscopically purple-brown be coming greyish in 3% KOH. Wall smooth. Basidia dimorphic, short clavate and 20.0-22.5 x 12.5 µm, clavate and 26.2-32.5 x 12.5-15.0 µm, all four-spored. Cheilocystidia globose to short ellipsoidal, 22.5 µm in diameter to 70.0 x 45.0 µm, hyaline, thin walled, smooth. Pleurocystidia ellipsoidal, 56.0-75.0 x 35.0-44.5 µm, very numerous, mostly bridging between two opposing lamellae, hyaline, thin walled, smooth. No other cystidia present. Pileal surface somewhat cellular but all the cells elongated in a radial direction. Pileal context pale yellow-brown in 3% KOH. Universal veil felt-like and at first continuous over pileal surface, soon breaking up into small irregular patches, tan, composed of somewhat interwoven chains of cells. Cells cylindrical to greatly swollen, constricted the septa, seldom branched, hyaline, smooth, thin walled. Cells 2.5-23.0 µm in diameter. Annular line at stipe of similar cells. Clamp-connections rare on stipe.
Habitat. Terrestrial, on soil and conifer needle duff. Loosely clustered.
The tan color of the universal veil and yellow-brown pileal context are distinctive features of this species. The eccentric germ pore of this species and of C. bubalinus distinguish them from others of this section present in the western states.
Observations: Spores [20,1,1] 11.3-12.1 x 7.3-7.8 µm, ellipsoid with rounded base and apex, and eccentric, c. 2 µm wide germ pore, dark red-brown; Q = 1.50-1.60, av. Q = 1.55; av. L = 11.8, av. B = 7.6 µm. Basidia 16-36 x 10-14 µm, 4-spored, surrounded by 3-6 pseudoparaphyses. Pleurocystidia 55-80 x 28-40 µm, obovoid, ellipsoid, ovoid or subcylindric. Cheilocystidia 35-60 x 25-40 µm, (sub)globose to ellipsoid. Veil made up of hyphoid, thin-walled elements, up to 80 x 4-18 µm, cylindrical, somewhat inflate or with median constriction; terminal cells ellipsoid, clavate or fusoid. Clamp-connections not found.
Notes: The poor collection exists of only one basidiocarp, two stipes, and a small part of a stipe. However, all microscopical features could be found in the material. Clamp-connections were not been found, but according to Van De Bogart these are - although rare - present on elements of the stipe. The sporelength we found is rather larger than Van De Bogart described (Van De Bogart: 8.7-11.3 x 6.2-8.8 µm).
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