Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 63. (Budapest 1971)
Bohus, G.: Agaricus studies III.
Herbarial data: Mts. Börzsöny: between Szokolya and Királyrét, under Carpinus at border of rivulet, 7 Sept., 1969, leg. E. KISVÁRI; — near Magyarkút, in deciduous wood (Quercus, Carpinus ), 18 Aug., 1970. leg. S. MAGYAR; — near Nógrádverőce, Mt. Borbélyhegy, in deciduous wood (Quercus, Ulmus, Carpinus), 30 Aug., 1970, leg. I. FERENCZ. Mts. Visegrád: near Esztergom, in hornbeam-oakwood, 20 Aug., 1970, leg. GY. KISSZÉKELYI. Abádszalók, Com. Szolnok (brought to market in Budapest), 6 Sept., 1970, leg. Mrs. TÓTH. Remarks: Agaricus elvensis sensu B. & B. is a Lepiota of the acutesquamosa group, according to examinations by DENNIS, ORTON and HORA (1960), HEINEMANN (1955), and REID (1970). On the basis of a photocopy received of the type-material, and the results of examinations made on the spores, I am of the same opinion. I avail myself of this opportunity to thank D. A. REID for his kind help in this problem. The Campesler-group Agaricus campester (L.) FR. var. equestris MOELL. The cap and stem of this variety turns yellowish when touched. It could be established, however, that the yellow discoloration of the fruit bodies, appearing at various times in the same site, is of different rate, not infrequently quite weak. The yellow tint tends to deepen in the course of the modified Herpell-preparation, so that the herbarial material is quite distinct from the other varieties of the species. The Radicatus-group Agaricus radicatus VITT, sensu ROMAGN. (Fig.) Rarely mentioned in literature. The species is very similar to Agaricus bresadolianus, as already mentioned in the description of this latter taxon (BOHUS, 1969). The distinguishing features are the shape of the stem, the sterile edge of the gill, the larger spores, and the different habitat. Identification is further facilitated by the fact that A. radicatus does not produce such regular fruit-bodies (with a round pileus) as A. bresadolianus. For the sake of establishing the limits of variations, a description based on numerous specimens from Hungary seems to be warranted. Pileus semiglobate, convex then expanded with a flattened, finally depressed, centre; fleshy; 4—9 cm.; first whitish or dirty whitish, then on a whitish or some lighter ground with appressed, more or less brownish or greyish brown, sometimes ochreous yellowish squamules or squames, or radially fibrillose, not rarely turning yellowish when touched. Gills free; 3—6 mm. broad; at first light or vivid rosecoloured, finally blackish brown. Stem clavate or tapering upwards from a wide base, or cylindrical, but below nearly always obconical; short, 3—6 cm. long, (8)—10—20 mm. thick; at first pithy, finally fistulöse; white or whitish, turning yellow or rusty yellow when touched; with one or some vigorous mycelial strands. Ring pendulous, white, thin, sometimes fugacious. Flesh white; when cut not changing, or turning rusty ochre or carneous rusty ochreous; chemical reactions: with SCHAEFFER and Lugol reagents with phenol-aniline, guaiac tincture, guaiacol solution positive, with strong sodium hydroxide immediately yellow. Smell as in
