B. Papp szerk.: Studia Botanica Hungarica 35. 2004 (Budapest, 2004)

Gönczöl, János; Révay, Ágnes: Aquatic Hyphomycetes in two streams differing in discharge and distribution of leaf litter

Table 2. Percentage composition of the leaf litter in the streambed above the sampling sites of the two streams. Species Deszkametsző Bagolybükk 12 12 Oct. Nov. Oct. Nov. Oct. Nov. Oct. Nov. Acer campestre 0.2 0.6 8.1 2.2 20.4 20.6 Alnus glutinosa 8.6 17.4 45.1 40.0 Carpinus betulus 41.5 35.7 32.1 14.0 67.6 55.8 5.9 11.1 Cerasus avium 0.8 Cornus sanguined 1.2 0.1 1.9 Corylus avellana 4.5 0.9 2.4 1.9 2.1 Crataegus monogyna 2.4 2.1 Fagus sylvatica 0.0 33.8 24.6 36.9 15.8 23.2 Populus tremula 9.2 o.s Pyrus sp. 1 Quercus cerris 8.3 4.1 7.2 4.5 3.8 0.4 Quercus petraea 0.9 1.3 0.4 l.S 10.3 0.5 4.3 Robinia pseudacacia 4.3 7.1 Salix sp. 11.4 3.6 0.4 6.3 0.3 17.8 7.2 Sorbus torminalis 0.3 0.4 0.9 1.4 Tilia cordata 24.6 16.4 25.9 2.9 3.2 1.8 1.7 6.8 Tilia platyphyllos 2.8 0.4 1.7 2.1 Ulmus laevis 4.3 2.7 concentrations occurred in November in both streams. Great differences in mean number of conidia per litre were found between sites in the autumn samples. The longitudinal change of conidial numbers showed opposite trends in the two streams. The numbers of conidia in October and November were significantly higher at site 1 (upstream) than at site 2 (downstream) in the Deszkametsző, whereas in the Bagolybükk significantly higher numbers of conidia were found at site 2 than at site 1 in November (Table 4). Although 60% of the encountered species occurred in both streams, there were differences between the composition of the conidial populations (Table 5). Altogether 12 species occurred frequently (more than 5% of the total collected on at least one occasion) in both streams. Four species - Alatospora acuminata,