Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 91. (Budapest 1999)

Bohus, G., Vasas, G. ; Locsmándi, Cs.: Two new fungus species from Hungary (Basidiomycetes, Agaricales)

ANNALES HISTORICO-NATURALES MUSEI NATIONALIS HUNGARTCI Volume 91. Budapest, 1999 pp. 37-44. Two new fungus species from Hungary (Basidiomycetes, Agaricales)

1 G. BOHUS

1

, G. VASAS

1 & Cs. LOCSMÁNDI

2 Department of Botany, Hungarian Natural History Museum H-1087 Budapest, Könyves Kálmán krt. 40, Hungary e-mail: vasas@bot.nhmus.hu Mikoszféra Ltd., H-l 107 Budapest, Bihari út 3/C, Hungary BOHUS, G., VASAS. G. & LOCSMÁNDI, cs. (1999): Two new fungus species from Hungary (Basidiomycetes, Agaricales). - Annls. hist.-nat. Mus. natn. hung. 91: 37-44. Abstract - Two new species (Agaricus annulospecialis BOHUS, LOCSMÁNDI et VASAS, Trícholosporuin subgoniospermum BOHUS et VASAS) are described. T. siibgoniospermum and the other recently described species are introduced in the Tricholosporum keys made by BARONI (1982) and GUZMAN, MONTOYA & BANDALA (1994). With 2 figures and one table. Agaricus annulospecialis sp. n. (Fig. 1) Remarks. This apparently new form of Agaricus was found in the Mályvádi-erdő (forest) at Gyula (Békés county, SE Hungary). The probability of finding an unknown species has already been raised on the field. Several fruit bodies were observed on the field with individuals in different stages of development. Taking the young snow-white specimens in the hand the characteristic rimmed structure of the ring was striking. On the basis of this we tried to assign it to Xanthodermatei sectio, without analysing further criteria. The collar structure of the unknown species reminded us of the ring of A. pilatianus or A. pseudopratensis. Cutting the mushroom, however, we did not observe intense yellowing at the base of the stem and the odour was not unpleasant chemical-like, that is, the quality of the fruit body resembled more the members of the Arvenses sectio. The white colour of the fruit body turned yellow after 1-2 hours of storage, later turned to rusty yellow which is also typical of the Arvenses, especially the Silvicolae members. Our first impressions were changed by the structural changes in the collar of the older specimens. Young specimens have a rimmed straight standing collar which is changing later. The lower weaker general veil disappears and the collar is then pendent. Thus the mushroom reminds us more some species of the Silvicolae subsectio. Schäffer test reaction being positive, the Xanthoderma relation was finally excluded. Diagnosis latina. Fungus in vicinitate Agarici silvicolae. Proprietates differtae: PiIeus primo niveoalbus, deinde vivido luteus (citrinus lepidoflavus vel ochraceo flavus. Lamellae primo vivido roseae. Annulus specialis: primo non pendens cum una acie in * Agaricus Studies XIV.