On the type of Coprinus nudiceps
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Original description

Coprinus nudiceps F. D. Orton, sp. nov. Fig. 1, g-h.
Orton, P.D. 1972. Notes on British Agarics. In Notes R. bot. Gdn Edinb. 32: 142.

A C. misero a sporis majoribus et habitu robustiore differt.
Pileus ellipsoideus vel ovoideus 7-15/4-8 mm, dein expansus 9-24 mm interdum ad discum depressus, luteolus vel ochraceus dein ad discum fulvum vel cinnamomeum versus griseascens, primo laevis leviter nitidus, mox ad marginem dein ad discum versus sulcatus vel plicato-striatus, ad marginem postremo manifeste laceratus vel radialiter fissuratus. Lamellae liberae vel anguste adnatae, e pallide luteolo vel ochraceo mox umbrinae vel nigricantes, subconfertae, ad aciem primo albo-flocculosae. Stipes 30-60/0.5-1 mm, sursum attenuatus, leviter bulbosus (ad basim 1.5-3 mm latus) ex albido sordide cremeus vel cremeo-luteolofuscus, minute adpresse sericeostriatus, ad basim primo fibrillis albosericeis manifestis obtectus. Caro pilei concolorata ad discum admodum crassa. Odor nullus.
Sporae lentiformes, ellipsoideo-ovoideae vel subgloboso-triangulares interdum leviter 5- vel 6-angulatae, 13-15.5/8.5-9.5/10-12 µm (Fig. 1,h), poro germinativo medio, in cumulo violaceonigrae. Basidia 4-sporigera. Cystidia aciei lamellarum pyriformia vel utriformia interdum irregulare vel late fusiformia vel vesiculosa, 30-60/14-28 µm. Cystidia faciei lamellarum non vidi. Cellulae cuticulae pilei 10-26 µm latae. Setulae et sphaerocystes desunt.
Inverness-shire. Tomich, ad fimum equinum, 3 ix 1971, Orton 4133 (holo E).

Cap ellipsoid or ovoid 7-15/4-8 mm, then expanded ± plane 9-24 mm, margin becoming conspicuously split or lacerate radially, saffron or ochraceous (G in Colour Chart), then becoming grey from margin inwards and fulvous, sienna or cinnamon at centre, smooth and rather shiny at first then soon plicate or grooved-striate from margin inwards. Gills free or narrowly adnate, pale saffron or pale ochraceous then buff, soon umber or date-brown to blackish, fairly crowded, edge white flocculose when fresh. Stem 30-60/0.5-1 mm (1.5-3 mm at base), attenuated upwards from slightly bulbous base, whitish then duty cream or pale creamy-buff, minutely adpressedly silkyfibrillose and ± interruptedly striate, base with conspicuous adpressed white silky fibrils when fresh. Flesh concolorous in cap, often fairly thick at centre. Smell none. Spore-print violaceous-black.
Spores lentiform, ellipsoid in side-view, subglobose-triangular or slightly 5- or 6-angled in face-view, 13-15.5/8.5-9.5/10-12 µm (Fig. 1,h), germ-pore central. Basidia 4-spored. Marginal cystidia pyriform to ± utriform or irregularly or broadly fusiform or vesiculose, 30-60/14-28 µm. Facial cystidia not seen. Cells of cap cuticle 10-26 µm broad. Setules and sphaerocysts absent. Inverness-shire. Tomich, on horse dung, 3 ix 1971, Orton 4133 (holo. E). Midlothian. Selm Muir Plantation, on (?cow) dung, 7 x 1967, leg. R. Watling. Mull. Torosay House, 10 ix 1968, leg. P. James, Watling 7859.

Readily distinguished from C. miser by more robust habit and cap with conspicuously split margin when mature and much larger spores. It belongs to section Hemerobii and is included in the revised key to this section given above.
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