Botanica Lithuanica, Volume 3, Number 3

1997 m.

This paper continues publication of the alien plant species recorded in Lithuania. The Brassicaceae family in Lithuania is represented by 53 alien species. Data on the firs record, distribution, habitats, level of naturalization, means of immigration and biology (time of flowering, fructification and reproduction) of each species are presented. Twenty two alien Brassicaceae species are naturalized, 29 are casuals and naturalization level of 2 species is uncertain. Distribution on of ten species is mapped. Six Brassicaceae species are excluded from the list of alien plant species.

Keywords: alien plant species, conspectus, Brassicaceae, distribution, naturalization, reproduction, Lithuania.

Peculiarities of development of the aboveground and underground pats of Echinacea purpurea, from first to sixth growing years were investigated. The research was conducted in 1995–1996 in Kaunas Botanical Garden. Plants were cultivated in experimental field of garden, in sody-gley loam soil.

Keywords: Echinacea purpurea, cultivation, growth, development, phenophases.

Species diversity of Erysiphaceae fungi, their host plants and distribution in the former Soviet military forestries are presented in this paper. 32 species from 7 genera of these fungi were identified. Erysiphe valerianae, Microsphaera viburni, Phyllactinia fraxini, Podosphaera major, P. myrtillina are known to be rare in Lithuania. Common polyphagous species Erysiphecichoracearum was registered on Cirsium palustre, Sphaeroteca fuliginea on Arnica montana. Both hosts are not common for these fungi. Common Erysiphe heraclei was registered on Cicuta virosa for the first time in Lithuania.

Keywords: Erysiphaceae, species composition, host plants, distribution, military forestries, Lithuania.

Fifty three species of Hyphomycetes of 17 genera and 3 families (Moniliaceae, Dematiacea, Tuberculariaceae) and one of Mycelia sterilia were registered in six investigated former military forestries. Most species belonged to Romularia genus (34 species). Hyphomycetes were registered on 59 host plant species, most of them were herbaceous plants. The most common species were Ramularia coccinea, R. pratensis, R. decipiens, R. lactea, R. taraxaci, Trimmatostroma betulinum, Coniothecium complanatum, which are frequent in the whole territory of Lithuania. Fifteen species were reported for the first time in the country. Species composition slightly differed in various forestries. Some Hyphomycetes plant pathogens displayed high aggressiveness, e.g. Ramularia lactea on Viola sp., R. arvensis on Potentilla anserina, Valdensia heterodoxa on Vaccinium myrtillus.

Keywords: fungi, Hyphomycetes, plant pathogens, fungicolous, mycosynusia, military forestries, Lithuania.

Six wood-inhabiting marine ascomycetes were found on driftwood in the Gulf of Riga in Ragaciems (territory of the Kemeri National Park). These wood decomposing fungi are reported for the first time from Latvia. Ceriosporopsis tubulifera, C. halima, Corollospora intermedia, C. maritima and Marinospora calyptrata cause soft-rot of wood. Amylocarpus encephaloides cause brown rot of wood.

Keywords: marine fungi, ascomycetes, Pyrenomycetes, Plectomycetes, the Gulf of Riga, Latvia.

t is very important to adopt concepts and terminology according to the international consensus. In this paper definition of the most important Lithuanian concepts and terms in plant pathology and plant virology are presented and discussed (common concepts, species concept of viruses and phytoplasms).

Keywords: definition, disease, plant protection, species, virus.

First data on occurrence of aquatic fungi in the sulphuretted waters in Latvia are presented. 16 species of freshwater fungi belonging to Hyphomycetes and Oomycetes are listed. 2 taxa identified till the rank of the genus.

Keywords: aquatic fungi, freshwater Hyphomycetes, Oomycetes, species diversity, Latvia.