Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 63. (Budapest 1971)

Gönczöl, J.: Aquatic Hyphomycetes from the Mts. Börzsöny

Actinospora meqalospora INGOLD (Table II, Fig. 17, Plate III, 2) I found its conidia first in a material from January. Except for June, it was present in all later samples, considerably more frequent from January till May than in the succeeding months, but some specimens invariably occurred. The central part of the conidium is in general oval, occasionally wholly sphaerical; diameter 40—80 p., always filled with a granulöse content, usually extending also into the branches. The number of branches of the specimens hitherto found was 3—8, their length 120—190 u., thickness 8—10 u.. Conidia with many branches were observed mostly during the winter months, germinating ones only in the February sample. Alatospora acuminata INGOLD (Table I, Fig. 23, Plate II, 1) Apparently one of the commonest and most widely distributed species of the world. Forms differing from the well-known "alate" shape were also found. In the winter samples, containing the highest proportion of Alatospora acuminata (40—45% of all conidia present), pentacladous conidia occurred regularly: the main axis emitted not two but three branches (their frequency in the winter material was 1—2:100). Aside of the five branches, they wholly agreed with the description of Alatospora acuminata. MARVANOVA & MARVAN (1963) also observed this form (pentaradiate spore); in their material the lateral branches arose occasionally not from one point of the main axis, in contrast to my samples. On one occasion (February), I found also a six-branched form. This very interesting specimen did show some difference against the regular one: a well discernible swelling distinguished the point of emission of the four branches, the main axis being distended in this section. Concerning the seasonal frequency of the species, I found that the conidia, present in masses during the winter, occur rather rarely and sporadically in the summer to autumnal samples, and the transition too appeared rather gradual. Anguillospora erassa INGOLD (Table II, Fig. 12) and A. loiujissima (SACC. & SYD.) INGOLD (Table II, Fig. 11) The conidia of both species were found in every monthly sample. They occured in relatively higher numbers during the winter months (from January till April), but they were regular and constant members of samples deriving from later months too. With respect to the comparative samples, the species appeared in much higher proportions in samples from the upper reaches of the brook than in those of the lower ones. Especially the ratio of A. crassa decreased downstream gradually. Of the two species, A. longissima was invariably the more frequent. On some occasions I also found conidia resembling those of A. longissima, but of very great length (450—700 they belonged possibly to A. gigantea.