On the type of Coprinus roseistipitatus
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Original description
Coprinus roseistipitatus Van De Bogart in Mycotaxon 4: 262. 1976 (The genus Coprinus in Western North America, part 1: sect. Coprinus). Holotype: North America: state Washington, Lewis, Cispus Center, Gufford Pinchot Nat. Forest, 25 Oct. 1975, F. Van De Bogart 3369 (WTU).

Pileus at first glandiform, then conic, then campanulate with margins somewhat revolute and laciniate, when unexpanded 2.5 cm in length, expanding to 3.5 cm in width. Pale brown at first and remaining so at the apex, the remainder soon whitish, then black with whitish striae marking the interlamellar spaces. Pileal surface at first covered with smooth universal veil which then become scaly, then scales scattered and evanescent exposing plicate-striate surface. Margin attached to stipe by an annulus at first. Flesh thin and fragile. Stipe slender, tapering gradually toward the apex, 11.5 cm x 4.0-6.5 mm, hollow, lumen with a thinly dispersed webbing of hyphae, surface silky, wrinkled, white at base, in maturity the upper half of the stipe becoming pale pinkish grey, fading to grey when dried, annulus prominent, loose, becoming black on under surface when mature; stipe flesh thin and fragile although fibrous. Lamellae lanceolate, very crowded, free and remote, at first white, then pale pinkish brown, then black. Autolysis complete.
Spores nearly ovate, the apex slightly narrowed in dorsal view, 9.0-11.0 x 5.5-6.5 x 7.0-7.8 µm, apiculus large and distinct, germ pore somewhat eccentric, 1.5-2.5 µm in diameter. Color soot black en masse and nearly black microscopically in 3% KOH. Wall smooth. Basidia trimorphic, clavate and 25.0-28.0 x 8.0-11.5 µm, long clavate and 40.0-43.5 x 8.0-10.0 µm, ululiform and 48.0-50.0 x 9.0-10.0 µm, all four-spored, all sterigmata with refringent plugs, all basidia with a median grey pigment band. Cheilocystidia obovate, oblong, clavate, subglobose, occasionally interconnected, mostly pedicellate, 30.0-70.0 x 17.0-33.0 µm, pedicels up to 20 µm in length, cells distinctly pink en masse until destroyed by lysis. No other cystidia present. Pileal surface a compact layer of cylindrical, septate, thin-walled, radially oriented hyphae, in maturity mostly pigmented dark grey-brown, some cells dark, some light, some pigment in the walls, some pigment the intercellular spaces. Universal veil of scales on pileus and tomentum at stipe base. Scales of long parallel chains of slightly swollen cells, cells cylindrical, 5.0-22.0 µm in diameter, thin-walled, hyaline, rarely branching, showing some tendency to separate at the septa, smooth. Tomentum at stipe base very thin, composed of slender, cylindrical, hyaline, thin-walled hyphae, seldom branched, very interwoven, 3.0-6.0 µm in diameter, septation sparse. Annulus 1.0 µm wide. Clamp-connections absent.
Habitat. Coprophilous, on rabbit or deer dung in a very moist hardwood rain forest. Substrate covered a thin but persistent white feltlike mycelium.

This species somewhat resembles C. sterquilinus but differs in the brown color of the universal veil when young, the much smaller spores, the pink color of the stipe apex, the pink cheilocystidia, the blackening of the undersurface of the annulus, and the median grey band on each basidium.

Observations:
Spores [20,1,1] 8.7-10.7 x 6.3-7.9 µm, ovoid with rounded base and apex (base tending to conical), and slightly eccentric, c. 1.6 µm wide germ pore, dark red-brown; Q = 1.30-1.45, av. Q = 1.40; av. L = 9.7, av. B = 6.9 µm. Basidia 20-50 x 10-13 µm, 4-spored, surrounded by 5-8 pseudoparaphyses. Pleurocystidia absent. Cheilocystidia 30-48 x 14-38 µm, subglobose, ellipsoid, oblong or utriform. Pileipellis hyphoid, made up of mainly cylindrical hyphae; elements 30-150 x 4-18 µm. Veil made up of cylindrical, thin-walled elements, 30-150 x 4-18 µm, somewhat constricted at septa; terminal cells cylindrical with rounded or tapering apex. Only pseudoclamps found.

Notes: The collection exist of one good basidiocarp. A part of the ring is still available on that specimen. The apex of the sterigmen is dark coloured. This character is found in C. spadiceisporus too.
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