Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 67. (Budapest 1975)

Bohus, G.: Agaricus studies, V.

ANNALES HISTORICO-NATURALES MUSEI NATIONALIS HUNGAR1CT Tomus 67. Budapest 1975. Agaricus Studies, V. by G. BOHUS, Budapest Abstract — Description of two new taxa Agaricus bernardiiformis sp. n. and A. gennadii ssp. microsporus ssp. n., furthermore, floristical-taxonomical data of four known species. With 2 figures. Agaricus bernardiiformis sp. n. This species has been collected in the Festuca pseudovina-gY&ss\a>nd of the saline pastures of Hortobágy. It occurs under similar conditions also in the environment of Szalkszent marton lying 150 kilometres from the above territory. It grows in both areas together with the similar species A. bernardii. The two species can be distinguished also by collectors for market sale, for if they cut off the lower part of the stem and it does not turn red, it is not A. bernardii. Further characteristics: the ring and the veil covering the stem is of a cottony structure (on A. bernardii membranaceous); it has not a bad smell; the pileus at first breaking up into — especially matted — fibrillous scales ; up to now[no areolate scales, characteristic of A. bernardii have been recognized; the substance of the pileus is elastic though loose, therefore the fruit bodies — according to our measurements — are about one quarter lighter than the similar specimens of A. bernardii. It should be remarked that the vegetative mycelium is — observed in pure cultures — also of cottony structure and it differs from the appearance of the mycelium of A. bernardii. Pileus usque ad 15 cm latus, etiam posterius convexus, vel etiam in medio planus vel incavatus, margine incurvatus, carne crassus, primo albidus, deinde griseolus-griseobrunneolus-brunneolus, nonnunquam roseotinctus ; in squamas fibrillosas plerumque cirratas imprimis ad marginem scinditur. Lamellae angustae, primo cremeae-griseocremeae, deinde roseae, postremo nigrobrunneae. Stipes curtus, 3—5 cm longus, 1,5—3,5 cm crassus, in medio ventricosus, subtus paulatim tenuiescens, albus, in statu juvenili velo universali, structurae gossypinae coopertus. Annulus inferne adnatus, structurae gossypinae. Caro in pileo mollis, sed elastica, in stipite durior, alba, immutata, tantum in speciminibus nonnullis in altitudine lamellarum parum flavida; reactiones chimicae: reactio Schäfferii negativa, per ammóniám, formaldehydum solutum, solutionem Lugol, solutionem guajacoli, tincturam guajaci, acidum nitricum, solutionem phenol-anilinum et solutionem Pyramidon immutata, per anilinum purpurea vel vinacea, per natrium hydroxydatum pallide flava; lamellae per ferrum sulplmricum oxydatum pallide grisea. Odor exiguus. Sporae ovatorotundatae, plerumque cum guttula magna singulari, 6,2—8,2x5,4—6,4 u,m. Cystidia marginalia hyalina, clavata, 17—35x X 7—9,5 [xm. Edulis. Ann. Hist.-nat. Mus. Nat. Hung., 67, 1975