L. Hably szerk.: Studia Botanica Hungarica 18. 1985 (Budapest, 1985)

Révay, Ágnes: Dematiaceous Hyphomycetes inhabiting forest debris in Hungary I

slopes of the mounts Morgó-hegy, Fekete-hegy, Kelemen-hegy. The further sites are in the Bükk Mts, along some mountain streams; Odor-patak, Oldalvölgyi-patak, Hos s zú völgyi-patak, Garadnapatak. The collected material was of various states of decomposition, mainly decorticated highly decayed twigs were collected. Decaying twigs and branches were picked up at random from the litter and brought to the laboratory. The majority of the samples were examined immediately in the laboratory. Beside direct examination, a great part of the collected material was examined after incubation under moist condition in petri-dishes. ENUMERATION OF SPECIES Acrogenospora sphaerocephala (Berk, et Br.) M.B. Ellis (Pl.I. Fig. 1.). Conidiophores 140 -350 jum long, 7-11 Aim thick at the base, 4-5 Mm at the apex. Conidia subglobose, 24-28 x 21-24 Aim. Conidia are smaller than mentioned by ELLIS (1971) and fit closely with that of MATSUSHIMA (1975). Not uncommon in Hungary. - Found on decaying twigs, near the stream Odorpatak, Bükk Mts 29.5.1984.; near Rejtek in the Bükk Mts, 12.10.1984. Alysidium resinae (Fr.) M.B.Ellis (Pl.I. Fig. 2.). Conidiophores variable in length and in thickness. Conidia dark brown, single or in chains, subglobose 7-10 /im diam., or ellipsoidal 11-18 x 7-12 jum, nonseptate. Only very few data are known of this fungus in Hungary. - Found on dead branches. Verőcemaros, Börzsöny Mts, 15.6.1984. Bactrodesmium spilomeum (Berk, et Br.) Mason et Hughes. Sporodochia dark brown, punctiform. Conidiophores fasciculate, subhyaline, up to 90 jum long, 1.5-3 jam thick. Conidia pale brown, 28-44 x 9-12 .Aim, 3-5 (usually 4) septate, ellipsoidal or clavate. This species is reported from England and Czechoslovakia, where it occurs very rarely. (HOLUBOVÁ-JECHOVÁ 1972). Not uncommon species in Hungary. - Found on rotten twigs of Quercus sp

., Morgó-hegy, Börzsöny Mts, 15.6.1984. Brachysporium nigrum (Link) Hughes. Conidiophores dark-brown, 120-200 x 4-5 Aim. Conidia 3-septate, 17-19 x 8-10 jum, two middle cells dark brown, basal and apical cells hyaline or subhyaline, basal cell with small pedicel. This is a very common species in Hungary. It has been observed on numerous occasions with abundant sporulation in several samples of various woody-litter. - Found on rotten wood, near the stream Morgó-patak in the Börzsöny Mts, 5.4.1984., 14.9.1984.; Odor-hegy, Bükk Mts, 20.5.1984.; near Rejtek, Bükk Mts, 11.10.1984. Cacumisporium capitulatum (Corda) Hughes. Conidiophores 200-300 x 5-7 jum. Conidia 3-septate, two middle cells darker than others, 15-20 x 4-5 Aim. A common species in Hungary. - Found on rotten wood, Gál-hegy, Börzsöny Mts, 16.7,1981. Camposporium japonicum Ichinoe. Conidia 50-70 x 6, 5-7 Aim with a 25-30 urn long three- or four-radiate projection. Previously this fungus had been found sporulating only on decaying leafskeletons, in submerged or in terrestrial habitat. (GÖNCZÖL&RÉVAY 1983). It has not been found on dead twigs previously in Hungary. - Found on small twigs of Fagus silvatica, near the stream Oldalvölgyi-patak, Bükk Mts, 19.4.1984. Camposporium pellucidum (Grove) Hughes. Conidia cylindrical-fusiform, 60-95 x 5-6 Aim, usually with an apical projection of variable length. This is a well-known Hyphomycetes inhabiting leaf litter. During our observations on forest litter, we found this fungus several times in various biotopes. (GÖNCZÖL&RÉVAY 1983). Although it is a common species on leaf-skeletons, it had not been found previously on dead wood in Hungary. - Found on decaying twigs of Alnus glutinös a

, near Verőcemaros, Börzsöny Mts, 5.4.1984. Chloridium clavaeforme (Preuss) W.Gams et Hol-Jech. Conidiophores 40-70 x 3-3.5 jum, darkbrown, proliferating. Conidia 2-3 x 1.5-2 jum in slimy heads. According to literature data it is reported to be a common species on dead wood, but very few Hungarian findings are known so far. - Found on dead branch of Fagus silvatica, near Hármaskut, Bükk Mts, 5,6.1982. Chloridium virescens (Pers. ex Pers.) W.Gams et Hol.-Jech. var. chlamydosporum (van Beyma) W.Gams et Hol.-Jech. Conidiophores 100-120 x 3-3.5jum mid-brown, but towards the swollen tip becoming hyaline. Conidia ellipsoidal, subhyaline 2-4 x 1-2 jum aggregated in slimy heads. It is an uncommon species, only a few Hungarian data are known. - Found on dead branch of Carpinus betulus, Morgó-hegy, Börzsöny Mts, 9.3.1984. Cordana crassa Tóth (Pl.I. Fig.

3.). Conidiophores simple, dark brown, paler towards the apex, up to 250 Aim long, 5-8 Aim wide. Conidia 1-septate, obpyriform, 24-27 x 9-13 jum, basal cell dark brown, apical cell pale olivaceous brown. This species was described by Tóth from dead