Zs. P. Komáromy szerk.: Studia Botanica Hungarica 16. 1982 (Budapest, 1982)

Bohus, Gábor: Some results of systematical and ecological research on Agaricales, IX.

S T U D I A XVI. BOTANICA HUN GARICA (Antea: Fragmenta Botanica) 1982 p- 41-47 Some results of systematical and ecological research on Agaricales, IX. By G. BOHUS (Received November 10, 1981) Abstract: On the basis of taxonomical examinations, 2 new taxa (

Tricholoma nodulosporum sp.n., Agaricus campester var, xanthodermatoides var.n.), and a new combination (

Hebeloma subcaespitosum var, psammocoíum comb.n.) are described. The ecological researches included laboratory experiments with respect to salt tolerance and low temperature tolerance in Agaricus species; a further aim of the research was to establish whether there exist mycelium thalli without a formation of any fruit body. I. Tricholoma nodulosporum Babos & Bohus sp.n. Figs. 1-2 Iorigida Sing, section, which was a monospecific one in European flora up till now, has been increased with one species. The characteristic features of this section are the mainly violaceous colour of the gills and the stipe as well as the special form of the spores. The spores are as nodulose as in Inocybe praetervisa Quel., on the outline with 5-8 coarse obtuse warts. This is interesting because by SINGER' s statement (1962): "The nodulose spores of many Inocybes are unique in the Agarics, and, for that matter in the Agaricales

..." Pileus 4-6, 5 cm latus, carnosus, compactus, e convexo expansus, parum viscidus, pubescens-breviübrillosus, luride albidus aut luride violaceus, brunnescens, parum argenteo nitidus, margine primitus involuta. Lamellae confertae aut moderate, violaceae vel lilacinoviolaceae, tactu luride brunneae, emarginatae - dente decurrentes. Stipes solidus, 2,5-4 cm longus, 1-2 cm crassus, ventricosus aut basi parum bulbosus, metallice violaceus vel lilacinoviolaceus, praecipue tactu brunnescens. Caro albida vel violacea, parum brunnescens. Odor nullus. Sapor non specialis. Sporae in cumulo albae. Sporae nodulosae, 7,8-9,5 x 6-8,5/im. Basidia clavata, 30-35 x 6-8, 5 jam. Habitatio: ad folia coacervata in silva frondosa. Typus: 73168 in Herbario Musei Hist.-nat.Hung.

, Budapest. Mts. Budai: Mt. Szarvashegy, in Fageto-Orneto hungaricum, 5 Aug. 1980, leg. Sarkadi - Babos- Bohus - Nehéz - Rimóczi. Agaricus campester (L.) Fr. var, xanthodermatoides Bohus var.n. This is a variety which reminds of Agaricus xanthodermus

, since the cuticle of the pileus often radially cracked and the flesh in the base of the stipe is lemon-yellow or lemon-yellowish