Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 66. (Budapest 1974)

Bohus, G.: Agaricus studies, IV.

Typus: 49.103 in Herbario Mus. Hist.-nat. Hung., Budapest. Budapest, Mosoly-utca, in horto, 5 Maii 1971, leg. BABOS. Pileus convex-expanded, finally with a flattened centre, 13—18 cm in diam., fleshy (about 2 cm thick) ; entirely brownish grey ; pellicle soon breaking up and becoming on a lighter ground darker fibrilloso-squamose, towards the margin fibrillose. Gills free, broad: 8—18 mm deep; finally dark chocolate brown. Stem attenuated towards base, 8—9 cm long, 25—50 mm thick ;' dirty whitish. Ring sheathed above; double; margin thick; whitish. Flesh whitish, turning in the base chrome yellow with an orange tinge, when cut. Smell strong, carbolic, more pungent when boiled. Spores short ovoid or ovoid, rarely ellipsoid, 5—7 x 4.3—5 p. Marginal cystidia basidium-like or larger, as the type. Agaricus pilatianus f. silvaticoides f. n. Differing from the type in the following characters: pileus at first entirely light brown or greyish brown and with a fibrillose structure, later squamulosesquamose on a lighter ground. A typo differt: Pileus primum omnino pallide brunneus vel griseo-brunneus et structura fibrillosus, dein super substratum clariorem squamidosus-squamosus. Typus: 49.105 in Herbario Mus. Hist.-nat. Hung., Budapest. Budapest, Rómaifürdő, "Május 1 csónakház" (= boathouse) ad viam, 9 Iunii 1971, leg. KISSZÉKELYI. Further herbarial data: Budapest, Rómaifürdő, same site as for type, 4 Oct. 1968, 1 June 1971, 3 Sept, 1972, leg. KISSZÉKELYI. The same thallus at different times may give fruit bodies much resembling either A. silvaticus or A. haemorrhoidarius, at other time the same thallus develops specimens rather reminiscent of A. pilatianus. The description of the specimens least resembling A. pilatianus is as follows: Pileus at first semiglobate, then convex, 4—7 cm in diam., at first entirely lighter dirty brown or greyish brown with a fibrillose structure ; pellicle later breaking up and becoming on a lighter or whitish ground densely fibrilloso-squamose, like an A. silvaticus or A. haeomorrhoidarius. Gills free, about 3 mm deep, at first whitish, then greyish rosy, at length chocolate brown. Stem clavate or attenuated below, 6—7 cm long, 15—18 mm thick, white, smooth. Ring sheathed above, double, edge threefold, white, edge may be brownish. Flesh white, turning in the base lemon chrome when cut. Smell strong, carbolic, smelling months long. Spores short ovoid or ovoid, rarely ellipsoid, 5—6.5x4—5 p. Marginal cystidia basidium-like. This form well represents how the threefold edge of the ring developed characteristic of A. pilatianus. At first the stem is entirely surrounding velum universale is divided at the middle of the stem. Its upper part forms the inner layer of the ring while the lower disappears without a trace. The velum partiale gives rise to the outer layer of the ring. The ring has three edges, these may partially be coloured, the two inner edges developed from the velum universale. Agaricus xanthodermus GENEV. S. str. The characteristics separating it from A. pilatianus have been mentioned in the key. Morphological and anatomical differences may be perceived and even in its mode of living the two species diverge from each other.