Articles by Taxonomic Group

During studies concerning the occurrence of some fungi and fungus-like organisms in the Biała River in Bialystok, forty-three species were established. Among 34 straminipilous fungi, the most common species were Achlya americana, A. debaryana, A. polyandra, Aphanomyces laevis, Dictyuchus monosporus, Pythium debaryanum, Saprolegnia ferax, and S. parasitica. New for the Polish fungal biota were Achlya ambisexualis, Calyptralegnia basraensis, and Achlya papillosa. Achlya crenulata, A. diffusa, A. flagellata, Aphanomyces stellatus, and Pythium afertile were considered rare. Physical and chemical analysis showed that the water of Biała River in Białystok had a high content of ammonium nitrogen and phosphate, reflecting poor cleanliness.

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.

Straminipilous organisms and fungus species on dead fragments of 25 taxa of wetland plants from three water bodies were investigated. A total of 219 fungal taxa, including 85 straminipilous organisms and 134 fungus species were recorded. The largest number of straminipilous organisms and fungus species occurred on fragments of Lathyrus palustre and Rorippa amphibia (45 and 44 species respectively), the fewest on Calla palustris (20). The most common species were Chytridium xylophilum (on 23 plants), Pythium rostratum (on 15), Pithomyces obscuriseptatus (on all plants), Trinacrium subtile (on 17) and Titaea (Tetracladium) maxilliformis (on 16). The larger numbers of species were recorded in running water (Jaroszówka Spring, Supraśl River, 124 and 122 respectively), with fewest (106) in stagnant water at Dojlidy Pond. Thirty-one taxa were recorded for the first time from Poland.

The authors investigated aquatic fungi and chromistan organisms growing on the dead specimens of 11 species of free-floating plants in the water from three limnological and trophical different water bodies (spring, river and pond). On the specimens investigated plants in the water of water bodies of north-eastern Poland they identified 129 species including 57 chromistan organisms and 72 fungus species. The most common taxa were Aphanomyces laevis, Thraustotheca clavata, Pythium inflatum, P. rostratum, Anguillospora filiformis, A. pseudolongissima, Angulospora aquatica, Heliscus submersus, Lemonniera aquatica, Pithomyces obscuriseptatus, Tetracladium marchalianum, Tricellula aquatica. Most fungus species were observed on the specimens of Utricularia minor, U. vulgaris (each 36) and Hydrocharis morsus-ranae (34), fewest on Lemna gibba (22), Aldrowanda vesiculosa and Lemna minor (each 23). The most taxa were growing in the water from River Supraśl (64), the fewest in the water from Spring Jaroszówka (55). A number of chromistan organisms and fungus species (2 and 11 respectively) appeared new to Polish waters.

Studies on the occurrence of aquatic fungi in the bathing sites of the river Supraśl in Podlasie Province of northeastern Poland were conducted in the years 2001-2003. Some hydrochemical analyses were performed using standard methods. Bait method was used to isolate the fungi. The following species were identified: fish pathogenic fungi – Achlya orion, Aphanomyces laevis, Dictyuchus monosporus, Saprolegnia ferax, S. monoica, and S. parasitica; human pathogenic fungi – Aspergillus candidus, Candida albicans, Lagenidium humanum, Penicillium mycetomagenum, Rhizophydium keratinophilum, and Trichosporon cutaneum; and phytopathogenic fungi – Achlya racemosa, Pythium butleri, P. myriotylum, and P. debaryanum. Physicochemical parameters of water in the bathing sites had no important effect on the presence of fungi.

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.