Articles by Taxonomic Group

Excretion into the environment of dissolved organic matter produced during photosynthesis is a characteristic phenomenon for several species of aquatic macrophytes (Wetzel 1969 a, b). Several of these substances are imbibed by heterotrophic microorganisms and may also inhibit the growth of other hydrobionts. An examination of the interactions between macrophytes and aquatic fungi showed that during the growing period (spring, summer and autumn), relationships between these organisms change. At the beginning of the growth period, the number of species of aquatic fungi rose in the presence eight macrophytes; during the summer there was a decrease in the number of fungi observed; while in the autumn (end of the growing season) there was an inhibitive influence of macrophytes on the growth of aquatic fungi, which was higher in eutrophic water. This inhibitive influence depends probably on the storage of any secondary compounds during aging of several macrophytes, which inhibit the growth of several species of fungi and fungus-like organisms.

Three new taxa of Peronospora described from Bulgaria are revised: P. jordanovii is invalid and the type not extant, P. parietariae is most probably based on contaminated material, and P. knautiae var. longispora is apparently based on two fungi but only P. knautiae var. knautiae is present in the holotype. The presence in Bulgaria of Plasmopara on Geranium is not confirmed.

Of the 83 specimens of Peronosporales collected in the north-eastern part of Bulgaria in 1998 and 1999, and some 16 specimens collected earlier and present in herb. BUCM, two genera (Basidiophora and Bremiella), 6 species (Basidiophora entospora, Bremiella baudysii, Peronospora affinis, P. holostei, P. medicaginis-minimae, and Pseudoperonospora cannabina), and 32 fungus-host combinations are for the first time reported from this country. In addition, 30 new localities for previously known such combinations are included.