On the type of Coprinus palmeranus
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Original description
Coprinus palmeranus Van De Bogart in Mycotaxon 4: 248. 1976 (The genus Coprinus in Western North America, part 1: sect. Coprinus). Holotype: North America: state Washington, Mason, Olympic National Park, Oct. 1974, F. Van De Bogart 3340 (WTU).

Pileus at first glandiform, then conic, then campanulate and becoming revolute, when unexpanded 3.2 cm in length, expanding to 3.0 cm in width. White and light brown at the apex when young, becoming grey-white and brown at the apex with maturity, covered at first with small scales of the universal veil with maturity the universal veil scales becoming scattered and evanescent, slightly plicate striate where not covered with veil, margin at ,irst attached to stipe by partial veil, flesh very thin and membranous. Stipe hollow, the lumen stuffed with a loose webbing of hyphae, slender, base bulbous with a slender subtending rhizomorph, shaft tapering slightly towards apex, 8.5 cm x 3.0-7.0 mm, surface smooth and mostly glabrous with an occasional loose fibril, white and opaque, base with a scurfy area and a small free white membranous annulus, flesh somewhat fibrous although fragile. Lamellae lanceolate, free, very crowded, few short lamellulae present, at first white, then pink, then brown, then dark brown, then black. Autolysis complete.
Spores moderately flattened, laterally broadly ellipsoidal, dorsally narrowly ovate, 8.7-10.0 x 5.6-6.3 x 4.3-5.7 µm, apiculus present, small, germ pore slightly eccentric, 1.8 µm in diameter. Color soot black en masse and a dark purplish grey microscopically in 3% KOH. Wall smooth. Basidia trimorphic, short clavate and 20.0-22.5 x 12.5 µm, clavate and 31.2-37.5 x 10.0-11.3 µm, ululiform and 45.0-49.0 x 10.0-12.5 µm, sterigmata with refracive plugs, all four-spored. Cheilocystidia globose, obovate, lageniform, and ellipsoidal, 10.0 µm in diameter to 46.5 x 19.0 µm. No other cystidia present. Pileal surface a cutis of slender, radially oriented thin-walled hyaline hyphae. Universal veil scales composed of parallel chains of cells, cells cylindrical, some swollen and constricted at the septa, all hyaline, thin-walled 5.0-19.0 in diameter. Annulus membranous, composed of mostly slender cylindrical cells, sparsely septate, somewhat interwoven and anastomosed, hyaline, thin-walled, 2.5-11.5 µm in diameter. Clamp-connections present in stipe context, not common.
Habitat. Terrestrial, on clay soil in open grassy maple woods.

This species bears a striking resemblance to C. comatus in its overall appearance. It differs mainly in its much smaller stature and the much smaller size of the spores and basidia.

Observations:
Spores [20,1,1] 9.3-11.0 x 6.5-7.8 µm, ovoid with rounded base and apex (base tending to conical), and slightly eccentric, c. 1.5 µm wide germ pore, dark red-brown; Q = 1.35-1.55, av. Q = 1.40; av. L = 10.1, av. B = 7.2 µm. Basidia 20-50 x 10-13 µm, 4-spored, surrounded by 6-9 pseudoparaphyses. Pleurocystidia absent. Cheilocystidia 25-50 x 14-26 µm, (sub)globose, ellipsoid, ovoid, oblong or utriform. Pileipellis hyphoid, made up of mainly cylindrical hyphae; elements 30-140 x 6-22 µm. Veil made up of cylindrical, thin-walled elements, 40-150 x 4-20(-28) µm, somewhat constricted at septa; terminal cells cylindrical with rounded or tapering apex, sometimes slightly fusoid. Clamp-connections absent.

Notes: The ring, noted by Van De Bogart l.c., was not been found in the type material.
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