Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 70. (Budapest 1978)

Bohus, G.: Agaricus studies, VIII. (Basidiomycetes, Agaricaceae)

ANNALES HISTORICO-NATURALES MUSEI NATIONALIS HUNGARICI Tomus 70. Budapest 1978. Agaricus Studies, VIII. (Basidiomycetes, Agaricaceae) by G. BOHUS, Budapest Abstract — Two new statuses: Agaricus macrosporus (MOELL. et SCHFF.) PILÂT ssp. excellais (MOELL.) stat. n., A. floccipes (MOELL.) BOHUS emend. BOHUS stat. n. Further discussion on A. pampeanus SPEC, A. nivescens (Moell.) MOELL. and A. osecamis PILÂT is given. With 3 figures. Agaricus macrosporus (MOELL. et SCHFF.) PILÂT ssp. excellens (MOELL.) stat. n. Syn. A. excellens (MOELL.) MOELL., Danish Psalliota Species, 1951, p. 178. Concerning its microscopic characters, A. excellens does not differ from. A. macrosporus, the difference is apparent only macroscopically owing to its relatively more slender habit, and, besides this, it occurs in woods. In some cases it does not differ even macroscopically: thus, if we examine the photographs of A. marcosporus published by PILÂT (1953), we shall find that there are also specimens with characters of A. excellens among them, which is indicated by the characterization related to the stem in the description given on the basis of the collected material: "ca diametri pilei aequilongus". (MOELLER, 1951, said when describing A. excellens that the pileus was 10-15 cm, while the stem 1014 cm long.) A. macrosporus specimens of even longer stem than this were gathered in one of the pastures of Hungary (Szil, Com. Győr-Sopron, 21 Sept. 1975, leg. SZILI). The maximum measure found here was as follows: pileus 17 cm, stem 20X 3 cm. RICKEN'S (1910-1915, s. n. Psalliota augusta) fungus is interesting. It was found in a pine forest, in accumulated pine needles. MOELLER considered it A. excellens, because of its habitat, although its measures correspond to those of A. macrosporus : pileus 25 cm, stem 12 cm long and 6 cm thick. A further difference between the two species, according to MOELLER, was the fully white colour of the A. excellens pileus; this, however, occurs also with A. macrosporus, when it grows in cloudy weather. The ecological difference evident only in habitat does not justify the categorization of A. excellens as an independent species. DATA TO THE KNOWLEDGE OF THE CAMP ESTER-GROUP Agaricus pampeanus SPEC. HEINEMANN (1962, 1965) thoroughly dealt with this species, which — according to his statement — is widespread in Argentina. The material of a gathering in Morocco (Témara sur la côte entre Rabat et Casablanca) also proved to be this species. It is likewise widespread in the saline pastures of Hortobágy in Hungary; in one occasion (16-17 Nov. 1966), it grew in such a huge quantity that the grasslands looked white. HEINEMANN saw two gatherings from Hortobágy and he informed us about his opinion in his letter as follows: "Je pense que les deux récoltes peuvent être rattachées A. pampeanus SPEC". Hereby I express my sincere gratitude for his kind examination. HEINEMANN (1965) makes an interesting statement on this species: "A. campester s. str. est une espèce mésophile préférant les prairies pâturées établies sur sol frais ou peu sec (Lolieto-Cynosuretum notamment). Dans les formations herbeuses sur sol plus sec il existe des espèces voisines — dont probablement. A. pampeanus — qui ont généralement été confondues avec A. campester dont elles semblent ne différer que par un petit nombre de caractères quantitatifs." This view is justified by the ecological conditions prevailing in the habitat of A. pampeanus in Hungary. Here the association is Festucetum pseudovinae. Its occurrence along the coasts of Morocco is also remarkable. In the saline pastures of Hortobágy, there are several other coastal Agricus species occurring besides A. pampeanus such as A. bernardii.