B. Papp szerk.: Studia Botanica Hungarica 29. 1998 (Budapest, 1999)

Gönczöl, János; Révay, Ágnes: Aquatic Hyphomycetes in a tributary of the Morgó stream, Börzsöny Mts, NE Hungary

common to both sites, Kendall's index was calculated from the sum of the lower percentages of occurrence in either of the two communities: s 2^ min 1 xij, xik ] i=\ where XJJ and xik are the proportion of total sample belonging to ith species in samples j and k, s = number of species. RESULTS Physicochemical characteristics of the Csömöle stream at the studied site are summarized in Table 1. The chemical data show that this tributary can be classified as a moderately hardwater stream with high conductivity and alkaline pH. Analysis of the leaf substratum collected from the stream bed shows that the Csömöle stream around the study site is lined by several tree species, the most common amongst them being Carpinus betulus and Fagus sylvatica (Table 2). The fungal species encountered on the six sampling occasions and their proportions in the stream spora are listed in Table 3. In total 45 fungal species were detected by water filtration. Thirty-three are described, a further 9 were identified to genus and the remaining 3 were of unknown affinities. The total number of species recorded varied temporally during the study. The highest species number occurred in October and the lowest in June. The highest conidial concentrations occurred in December and the lowest were found in January. In April, June and October the conidial numbers were almost the same (Table 3). A high proportion (48%) of the stream spora (sum of all Table 1. Physicochemical and hydrological characteristics of the sampling site at the Csömöle stream. Site Cs data altitude (m) 190 distance from the spring (km) 2.07 channel gradient (%) 3.82-4.43 stream order second temperature (°C) 0-17 pH 7.8-8.3 total hardness (d°) 13.5-17.5 conductivity (u.S/cm) 400-720