On the type of Coprinus saccharomyces
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Original description

Coprinus saccharomyces sp. nov. P.D. Orton.- Figs, 12, 250
Orton, P.D. 1960. Agarics and Boleti 3. In Trans. Br. mycol. Soc. 43: 202.

Pileus primo ovoideus vel glandiformis, 7-12 mm. altus/5-7 mm. latus, dein expansus ad discum obtuse umbonatus 16-20 mm., totus pallido-griseo granuloso-floccosus, ad discum vulgo crassiore sordide ochraceo- vel brunneo-floccosus, ad marginem postremo recurvatus et radialiter fissuratus. Lamellae liberae, ex albo nigricantes, haud confertae, interdum primo latae, ad aciem primo albo-granulosae vel -floccosae. Stipes 24-40/1-2 mm., aequalis, albidus interdum sordide brunneotinctus, primo totus albido vel pallido-griseo granuloso-floccosus postremo glabrescens, solidus. Caro tenuissima. Odor Saccharomycetis, fracta vel inclusione fortiore olet. Sporae ellipsoideae leviter amygdaliformes, a perisporio aliquantum indistincte tunicatae, (14-)15-19(-20)/9-10 (Fig. 250). Basidia 2-sporigera, ca. 36-38/9-10 µm. Cystidia aciei lamellarum spheropedunculatae vel clavatae, 42-90/14-44 µm. Cystidia faciei lamellarum elongato-fusiformia vel -ellipsoidea, 60-105/20-32 µm. Cellulae veli pilei globosae vel ellipsoideae vel pyriforme-vesiculosae, verruculoso-punctatae, haud raro brunneo-incrustatae, 24-60 µm latae, simul infra eis cellulis paucis cylindricis angustis.
In solo inter graminos, Carnwath, Lanarkshire, 28 Sept. 1958 (typus in Herb. Kew.). A C. narcotico et sociis basidiis bisporigeris sporis majoribus et odore Saccharomycetis differt.

Cap at first ovoid or acorn-shaped, 7-12 mm. high/5-7 mm. broad then expanded obtusely umbonate 16-20 mm., entirely pale grey mealy-floccose, flocci at centre often slightly coarser and tinged dirty ochraceous or pale sepia, margin becoming recurved and radially split. Gills free, white, soon blackish, then black, not crowded, sometimes broad at first, edge white mealy-flocculose at first. Stem 24-40/1-2 mm, ± equal, hyaline grey or whitish, sometimes tinged dirty brownish, entirely whitish or pale grey mealy-floccose at first then ± smooth or silky-flocculose, solid. Flesh very thin, grey or blackish grey in cap centre, pale grey or tinged dirty brown in centre of stem. Smell of wet yeast, stronger after being cut or enclosed in tin. Spores ellipsoid slightly amygdaliform, with perisporial sac best seen on immature spores, often none or indistinct on mature spores (14-)15-19(-20)/9-10 µm (Fig. 250). Basidia 2-spored, ca. 36-38/9-10 µm. Marginal cystidia spheropedunculate or clavate often with long stalk, 42-90/14-44 µm. Facial cystidia elongate-fusiform or ellipsoid, 64-105/20-32 µm. Cells of veil on cap globose, ellipsoid or pyriform-bladder-shaped, warty punctate, some brownish encrusted-pigmentated, 24-60 µm diam., with a few narrow cylindrical hyphae cells at the base of these.
On soil in grass, Carnwath, Lanarkshire, 28 Sept. 1958 (type in Herb. Kew). Differs from others of the 'narcoticus' group in 2-spored basidia, large spores and yeast-like smell (see key, p. 198).
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