Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 63. (Budapest 1971)
Gönczöl, J.: Aquatic Hyphomycetes from the Mts. Börzsöny
Articiilospora tetracladia INGOLD (Plate I, 7) Arlieulospora tetracladia INGOLD forma angulata PETERSEN (Plate I. 8) I distinguished the two spore forms according to NILSSON (1964). Whereas the nominate form appeared sporadically in nearly all samples, the other one (forma angulata) occurred in some spores in the August sample only. Clavariopsis aquatiea DE WILD (Table I, Fig. 27) I found this species in every sample, but always seldom and sporadically; nor did its frequency vary to any extent during the year. In August, it was more frequent in the higher reaches of the brook than downstream. This contradicts observations which hold it more frequent in strongly polluted waters (SLADECEK. 1959; SLADECKOVA, 1963). Its frequency as related to water purity is considered equivocal also by other authors (MAR VAN OVA & MAR VAN, 1968). Clavatospora stellata (INGOLD & Cox) S. NILSSON (Table I, Figs. 14-16; Plate IV, 8) This is one of the conidia which appeared in considerable proportions in the samples taken during the winter. Their ratio was especially high in January — March (over 10%). The amount of conidia decreased to about one-third to onefourth of the earlier percentage beginning with April; it occured seldom in May. During the summer and autumn only one or two specimens could be observed, and none in August —October. Unfortunately, I was unable to distinguish the conidia of C. stellata from another, unidentified form, published by NILSSON (1964; p. 116, Fig. 11/d), and the more so as I found several transitional forms too. Clavatospora tentacula (UMPHLETT) S. NILSSON (Table I, Fig. 28; Plate II, 4) An aquatic Hyphomycete of very characteristic conidia. They have three very slender (about 1 \x), easily movable and flexible appendages originating from the clavate end of the main branch distending to a width of 5—7 p.. Both the main branch and the appendages are about 60 u. long, the measurements being rather constant. An apparently rare species. I found it first in August, and then some specimens occurred in every sample. According to my examinations —of a preliminary character —its occurrence seems to be restricted to the autumn months. Culieidospora sp. R. H. PETERSEN (Table II, Fig. 14; Plate III, 3) This conidium of a most interesting form is the rarest one among the fungi collected heretofore in the Morgó brook. It is probably the rarest aquatic Hyphomycete also in the whole world. As far as I know it was hitherto found in North America (PETERSEN, 1960), Canada (INGOLD, 1960), Sweden (NILSSON, 1962b)
