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Page number:113 
Remarks (internal):The basidiospores of the holotype mainly have an obtuse apex, in contrast to numerous other P. leiocephala collections cited as having basidiospores with an acute, often papillate end (Breitenbach & Kränzlin 1995, Lanconelli 2003, Orton 1972, Orton &Watling 1979, Uljé & Bas 1988, Uljé & Bender 1997). Despite this discrepancy, the examined collection falls within the range of variability cited for this species. It is well known that P. leiocephala is an extremely variable species both macroscopically and microscopically (Uljé & Bas 1988, Uljé & Bender 1997, Nagy et al. 2009). Its spore shape ranges from markedly rounded triangular with distinct angles to subglobose with hardly visible angles. Further, spore shapes commonly vary considerably within a single fruiting body, showing different proportions of rounded and triangular spores (Nagy, unpubl.).
This species was recently reduced to varietal status under P. plicatilis (Roux 2006). There is, however, strong (phylogenetic) evidence in favour of treating P. leiocephala as a species separate from P. plicatilis (Nagy et al. 2009).
 
Description type:Non-original description 
Description:Coprinus leiocephalus P.D. Orton, Notes from the Royal Botanic Garden, Edinburgh 29: 88 (1969). Fig. 16.
Observations on the type - The holotype contains mature, well-preserved fruiting bodies; unfortunately, however, only spores and incomplete, collapsed basidia could be observed.
Basidiospores [30,1,1] 9.5-12 x 8.4-9.5 x 6.2-7 µm, on average 10.73 x 8.81 x 6.73 µm, Q1 = 1.06-1.32, Q2 = 1.57-1.79 strongly lentiform, in the frontal view mainly ovoid, rarely rounded triangular, subhexagonal or subglobose, mostly with a rounded apex, rarely subpapillate, in the lateral view ellipsoid, with a moderately thickened wall, germ-pore eccentric, ca. 1.8 µm in diameter, color very dark reddish-brown, subopaque, smooth, with moderately thick wall; basidia four-spored, clavate, bimorphic, mainly collapsed; pleurocystidia and cheilocystidia collapsed; veil, pileocystidia, and caulocystidia not found.
 
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