On the type of Coprinus ochraceolanatus
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Original description

Coprinus ochraceolanatus Bas in Persoonia Vol. 15, Part 3: 362. 1993 - Figs. 2a, 2b Pileus ad c. 50 mm latus, pallide griseus vel griseo-brunneus, velo adpresso, fibrilloso-squamoso, ochraceo ornatus. Lamellae liberae, confertae, purpureo-brunneae vel obscure griseo-purpureo-brunneae. Stipes ad 80 x 5.5 mm, sursum attenuatus, interdum pseudorhiza brevi praeditus, (sub)fasciculatus, griseo-albidus, dense ochraceo-fibrillosus. interdum basi ochraceo-squamulosus.
Sporae 8.3-13.4 x 5.7-7.3 µm, rubro-brunneae, ellipsoideae vel ovoideae, poro germinativo centrali instructae. Basidia tetraspora. Pleurocystidia 50-140 x 20-50 µm. elongato-ellipsoidea. vesiculosa, cylindrica vel late fusiformia. Cheilocystidia 30-120 x 15-50 µm, primo subglobosa, postea ellipsoidea, oblonga, clavata vel cylindrica. Pileipellis ex hyphis repentibus 8-26 µm latis constans. Velum cellulis cylindricis vel subfusiformibus, flavo-incrustatis, 45-200 x 7-20 µm metientibus. Fibulae adsunt. Typus: 'Netherlands, prov. Zuid-Holland. Voorschoten. 31.V.1972. C. Bas 5813 (L).'

Pileus just before expanding up to 30 x 20 mm, ovoid, sometimes with truncate apex and irregular somewhat lobed margin, rather pale grey (Mu. 5 Y 6/1) at margin to somewhat darker (5 Y 5/1) near apex, but slightly more brownish although not as brown as 2.5 Y 6/2 to 5/2 in Bas 5813, rather more brown (7.5 YR 3/2 to 10 YR 4/3) in Uljé 1062, deeply and densely sulcate at margin, sulcate-striate near centre, with appressed (but in young buds suberect), long, thin, fibrillose, ochraceous to salmon-ochraceous (10 YR 7/4 to 7/6) velar scales condensed to a thin, felted, salmon-ochraceous patch at centre; margin of cap in early stages loosing contact with stem; pileus up to c. 50 mm when expanded. Lamellae, L = 36-41,1 = 1-3(-5), crowded, free, rather narrow (up to 4 mm wide), already in young buds fairly dark chocolate-brown (7.5 YR 3/2), finally dark greyish purple-brown (5 YR 2/2) with thin, pale ochraceous, subfiocculose edge; Pleurocystidia visible with handlens. Stipe up to 80 x 5.5 mm, tapering upwards, hollow, sub-fasciculate to fasciculate, in some specimens with thin, up to 12 mm long pseudorhiza, slightly greyed whitish, densely fibrillose, with ochraceous tinge because of rather deeply ochraceous-yellow superficial fibrils (under lens), especially near base sometimes with a few incomplete, pale ochraceous, floccose girdles or many small, similarly coloured scales. Context ± chocolate-brown in centre of cap, slightly more greyish purple-brown in base of stipe and paler along cavity of stipe; rest pale. Smell indistinct, weakly fungoid. Taste subraphanoid with somewhat bitterish, unpleased aftertaste. Spore print not available.
Spores [100,5,3] 8.3-13.4 x 5.7-7.3 µm (L x B), av. L = 9.4-12.3, av. B = 6.1-6.8 µm, Q = 1.45-2.10, av. Q = 1.55-1.85, red-brown under microscope (not as blackish brown as in C. lagopus), ellipsoid to ovoid; germ pore central, 1.5-1.8 µm wide. Basidia 15-38 x 8-11 µm, 4-spored. Pseudoparaphyses 3-5(-6) around each basidium. Pleurocystidia 50-140 x 20-50 µm, elongate-ellipsoid, subglobose, cylindrical or broadly fusiform. Cheilocystidia 30-120 x 15-50 µm, in very young pileus subglobose or vesiculose, later rather more elongate or ellipsoid, clavate, oblong, vesiculose or cylindrical. Pileipellis consisting of repent, radial chains of ± cylindrical to inflated, 8-26 µm wide cells. Veil made up of parallel, yellowish, granular-incrusted hyphae of 45-200 x 7-20 µm large, often somewhat fusiform elements, not or only slightly constricted at septa. Incrustations on velar hyphae persistent in HCl 10% and alcohol, loosening in KOH and NH40H and dissolving in Melzer's reagent. Clamp-connections present.
Habitat, Fasciculate on old mud taken out of ditch one year earlier, in old deciduous forest on sandy clay with much humus and forest litter; gregarious on wood-chips; near old stump of tree.

Collections examined. NETHERLANDS: prov. Utrecht, Maarseveen, Zuidplas. 15 May 1982, C.B. Uljé 313; prov. Zuid-Holland, Voorschoten. 'Ter Wadding'. 31 May 1972, C. Bas 5813 (holotype, L); Ter Aar, 'de Put', 9 May 1990. C.B. Uljé 1062.

Coprinus ochraceolanatus is rather close to C. lagopus, but differs in having more slender and densely incrusted velar cells (up to 20 µm wide), whereas C. lagopus has smooth velar cells which are much more inflated (up to 40 µm wide). Macroscopically the colour of the veil of C. ochraceolanatus is yellowish ochre, in C. lagopus whitish or greyish, more rarely pale yellow but then the hyphal walls are not incrusted.
The length of the spores of C. ochraceolanatus shows a great deal of variation. In Bas 5813 the spores measure 8.3-11.8 x 5.8-6.8 µm, with a quotient of 1.45-1.90. The other collections examined have spores with a length up to c. 13 µm, whereas the breadth of the spores is very constant in all collections. Consequently the L/B-quotient is 1.50-2.10. Such a difference in size of the spores is not unusual in Coprinus and therefore we accept the collections with spores up to 13 µm long as to belong to C. ochraceolanatus also, because they share with the type-collection the yellow, granular-incrusted, 7-20 µm wide hyphae of the universal veil.
Kemp (1975a: 382; 1975b: 62) introduced the reactions of monokaryotic hyphae to oidia in cultures as a way of testing the degree of relationship among species of Coprinus sect. Lanatuli. Three interspecific reactions are possible: 1. hyphal tips of one species do not curve to grow towards oidia of another species ('no homing*); 2. hyphal tips of one species curve to grow towards oidia of another species ('homing'); 3. hyphal tips of one species grow towards oidia of another species and fuse with these, but the fusion is lethal ('homing and lethal'). Kemp considers case 3 as indicating the highest degree of relationship and case 1 as the lowest.
Coprinus ochraceolanatus (in Kemp's papers provisionally called C. ochraceovelatus, 1975a: 380) was tested in this respect against nine other species of sect. Lanatuli. In none of the tests with C. ochraceolanatus homing plus a lethal reaction occurred. In fact in most tests there was no homing at all. In three cases there was homing of hyphae towards conidia of C. ochraceolanatus, viz. with C. cinereus, C. macrocephalus, and C, radiatus, but in the reciprocal tests hyphae of C. ochraceolanatus showed no homing to conidia of any of the species involved.
Thus Kemp's tests strongly support the taxonomic value of C. ochraceolanatus as a species.
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Fig. 2a. Coprinus ochraceolanatus. All figures from Bas 5813 (type).
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Fig 2b. Coprinus ochraceolanatus. All figures from Uljé 1062. Up