On the type of Coprinus martinii
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Original description
Coprinus martinii P.D. Orton, sp. nov.
Orton, P.D. 1960. Agarics and Boleti 3. In Trans. Br. mycol. Soc. 43: 201.

Pileus primo ovoideo-cylindricus vulgo elongatus, 5-22 mm. altus/3-8 mm. latus, dein expanso-umbonatus margine revoluto 8-15 mm., cinereo-griseus, primo totus farinaceo-granulosus dein ad partem externam glabrescens et sulcatus. Lamellae liberae, e griseo nigrae, confertae, ad aciem primo atomato-flocculosae. Stipes 30-62/1.5-2 mm. (ad basim < 5) ad basim incrassatus vel sursum attenuatus, pallido-griseus dein infra ohscuriore griseus, hyalinus, primo minute sericeo-fibrillosus dein glabrescens, ad basim tomentosus. Caro hyalina, alba, ad basim stipitis grisea. Odor nullus. Sporae ellipsoideo-amygdaliformae poro germinativo, a perisporio tunicatae, laeves, 12-16(17)/6.5-8.5 µm. Cystidia 'aciei et faciei lamellarum cylindrico-fusiformia vel elongato-ovata, copiosa, < 115 µm longa' sec Favre. Cellulae veli pilei globosae vel vesiculosae, minute granuloso-punctatae, 24-52 µm latae.
Ad stipulas Caricis, Scirporum, Juncorum. Ad stipulas Scirpi caespitosi, Sheffield, Yorks, 9 Oct. 1954 (legit D.A. Reid, typus in Herb. Kew.); Shieldaig, Wester Ross, 2 June 1947 (legit R.W.G. Dennis); ad stipulas Junci subnodulosi, Parish Marsh, Surlingham, Norfolk, 26 May 1947 (legit R.W.G. Dennis). C. cinerato et C. narcotico affinis, sed a sporis magnis ellipsoideo-amygdaliformibus, habitatione, absentia odoris facile distinguitur.

Cap at first ovoid-cylindrical often elongate, 5-22 mm. high /3-8 mm. broad, then expanded umbonate with revolute margin 8-15 mm., ash-grey, mealy-pulverulent becoming smooth and sulcate in outer part as cap expands. Gills free, grey then black, crowded, edge atomate-flocculose at first. Stem 32-60/1.5-2 mm. (< 5 at base), ± thickened at base or attenuated upwards, pale grey, darker grey below when old, hyaline, minutely silky-fibrillose at first then smooth, base tomentose. Flesh hyaline white above, hyaline grey below. Smell none.
Spores 12-16(17)/6.5-8.5 µm, ellipsoid-amygdaliform with germ pore, smooth but with perisporial sac. Marginal and -facial cystidia 'abundant, cylindric-fusiform or elongate-oval, < 115 µm long' sec Favre. Cells of veil on cap globose or vesiculose, minutely granular-punctate, 24-52 µm diam.

On Carex, Scirpus and Juncus debris. On Scirpus caespitosus, Sheffield, Yorks, 9 Oct. 1954 (legit D.A. Reid, typus in Herb. Kew.); Shieldaig, Wester Ross, 2 June 1947 (legit R.W.G. Dennis); on Juncus subnodulosus, Parish Marsh, Surlingham, Norfolk, 26 May 1947 (legit R.W.G. Dennis). Related to C. cinerato et C. narcoticus, but easily distinguished by large ellipsoid-amygdaliform spores, lack of smell and habitat. This is C. martinii, first described by Favre (Bull. Soc. mycol. Fr. 53 (1937), 286), but without a Latin diagnosis (see key, p. 198).
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