Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 84. (Budapest 1992)

Gönczöl, J. ; Révay, Á.: Aquatic Hyphomycetes in softwater and hardwater streams of the Aggtelek National Park, NE Hungary

RESULTS A list of species encountered in the investigated streams is given in Table 2. Conidia of 52 taxa were found and some species were investigated sporulating on various natural substrata. The number of known species is 49, some of them identified to generic level only. There are 3 unknown species. Species reported for the first time from Hungary are marked with an asterisk. Some remarks or detailed description of selected species are given below. Actinospora megalospora INGOLD, Trans. Brit, mycol. Soc. 35: 66 (1952) - This species was collected from five of the investigated streams in seven samples. Detached conidia were not uncommon in foam (several dozens of conidia per drop) in different seasons of the year. Abundant sporulation was obtained on wood, twigs and herbaceous stems on some occasions but the fungus was not found growing on leaves. Alatospora acuminata INGOLD, Trans. Brit, mycol. Soc. 25: 384 (1942) - Found in every stream and in every sample throughout the year. It appeared to be a more important colonist on leaves than on wood. The predominant proportion of conidia in foam samples was certain in hardwater streams passing through beech forest, especially from autumn to spring. Among the conidia were some which were highly variable in shape and size. Alatospora constricta and Alatosporapulchella certainly occurred as well. Anguillospora crassa INGOLD, Trans. Brit, mycol Soc. 41: 367 (1958) (Fig. 3) - Found in the only softwater stream (Hidegviz-stream) of the investigated area. It was an important colonist on numerous old, black, decaying wood pieces and twigs in this stream. Greyish-white, slimy, spore mass appeared mainly in cavities at the surface. Detached conidia were unusually slender, 150-250 (300) urn long, not exceeding 10 um width, cylindrical-fusiform, base truncate, long percurrent basal extension frequently seen. Anguillospora crassa is a well-known wood-inhabiting species with a distribution markedly restricted to softwater in the Börzsöny Mts. (RÉVAY & GÖNCZÖL 1990). The present study confirms this observation. Anguillospora sp. 1. (Fig. 2) - Conidiophores up to 100 x 3-4.5 urn, simple, straight to sinuous, cylindrical or subclavate. septate, with 1-5 percurrent proliferations. Conidium release is by disarticulation at the basal septum. Conidia single, apical, sigmoid, slightly curved or falcate, 1-4 septate, 50-90 x 4.5-6 urn. Conidia of this species were occasionally seen in foam samples from three hardwater streams. Scattered conidiophores with developing conidia were also seen on decaying leaf veins from the same streams. Conidia of this fungus fit fairly well with those of Anguillospora pseudolongissima RANZONI, but branched conidiophores and no percurrent proliferations were described for its development. Anguillospora sp. 2. (Fig. 4) - Conidiophores hyaline, simple, straight, cylindrical, septate up to 150 x 45 ^m. with 3-4 percurrent elongations and sections of distinct wall-thickenings of the conidiogenous cell. Conidia hyaline, single, apical, sigmoid or crescent-shaped, 8-11 septate, 120-150 x 9-10 (11) urn, gradually tapering to 2-3 urn at the tips. Percurrent basal extension and minute remnants of the separating cell adpressed to the basal extension are present. These unvarying, characteristic conidia are well-known from twig-pack experiments in the Börzsöny Mts.. where this species is a persistent colonist on different kinds of twigs at Site II of the Morgó-stream (RÉVAY & GÖNCZÖL 1990). This species was frequently found in five hardwater streams of the investigated area, but not in the softwater stream. L. MARVANOVÁ has also found this species in Czechoslovakia and regards it a species belonging to the "Anguillospora tongissima complex" (pers. comm.). Arbusculina fragmentans MARVANOVÁ, Trans. Brit, mycol. Soc. 90: 607 (1988) (Figs 17-20) - Minute, discrete, profusely sporulating colonies of this fungus were found on a black, decaying twig (Alnusglutinosa?) collected from Hidegviz-stream, 19 March 1991. Conidia (part-conidia. conidial fragments) consisting of a structure of sometimes inflated, irregularly branching chains of cells. Conidial axis (recognizable in the case of larger conidia) usually up to 60-70 urn long, straight, curved or sinuous, with 0-10 primary, secondary or tertiary branches originating at different level of the axis. Cells hyaline, mostly elongate, 5-10 x 3-4,am. Identification of conidia of this species from foam remained doubtful until sporulating colonies were found on wood, however conidial fragments suggested the presence of this fungus in this habitat. Colispora clongala MARVANOVÁ, Trans. Brit, mycol. Soc. 90: 614 (1988) (Fig. 8) - Conidia of this species were seen in profusion in a foam sample collected from the Hidegviz-stream. 19 March 1991. Conidia fusoid, characteristically spindle-shaped, prevailingly straight, sometimes slightly curved (very rarely sigmoid), 3-10 septate, with truncated or obtuse-rounded base, 40-80 (95) x 8-16 urn. Very rich sporulation of this fungus