Botanica Lithuanica, Volume 4, Number 4

1998 m.

This paper continues publication of the conspectus of alien plant species recorded in Lithuania. The Onagraceae family in Lithuania is represented by 5 species, both Aceraceae and Geraniaceae by 4, Oxalidaceae by 3, each Balsaminaceae, Elaeagnaceae, Rutaceae, and Vitaceae by 2, each Hippocastanaceae, Linaceae, and Lythraceae by 1 alien plant species. Data on first record, distribution, habitats, level of naturalization, means of immigration and biology (time of flowering, fructification and reproduction) of each species are presented. 16 here described alien species are naturalized and 10 are casuals. Distribution of 4 species is mapped. One species – Geranium divaricatum – is excluded from the list of alien plant species.

Keywords: alien plant species, conspectus, Aceraceae, Balsaminaceae, Elaeagnaceae, Geraniaceae, Hippocastanaceae, Linaceae, Lythraceae, Onagraceae, Oxalidaceae, Rutaceae, Vitaceae, distribution, naturalization, reproduction, Lithuania.

Cultivars of woody angiosperms were investigated in dendraria, parks, gardens, streets and private dendrological collections all over Lithuania. Specific features of abundance, frequence, introduction possibilities of cultivars were explored.

Keywords: cultivar, angiosperms, woody plants, introduced species.

Algae of the Skroblus river in longitudinal section, some tributaries and 3 inclined ponds, located near the stream were investigated in July, 1996. Totally 182 taxa of algae were recorded. Diatoms (Bacillariophyta) and green algae (Chlorophyta) were the dominant groups in the studied area. Benthic algae (chiefly the benthic diatoms) clearly dominated among the other algae groups and comprised 50–70 % of all recorded taxa. Rarely found species predominated in the algae community of the stream Skroblus. The plankton density varied from 7 326 cells l -1 to 136 041 cells l -1.

Keywords: phytoplankton, benthic algae, species composition, abundance, the Skroblus river, Lithuania.

The first complete floristic study of macroalgae along the Lithuanian Baltic coastline indicated rather low diversity of benthic species: only 36 taxa were defined. Theoretically there are more than 40 species able to occur under such conditions (open sandy coasts with scarce boulder fields as the only hard substrate, salinity varying from 4 ‰ to 7 ‰). The red algae Furcellaria lumbricalis (Huds.) J. V. Lamour communities decreased in the area and bladder wrack Fucus vesiculosus L. almost disappeared evidently due to recent changes in environmental conditions (increased turbidity and severe storms). Upper littoral is occupied by opportunistic filamentous algae communities dominated by Cladophora glomerata (L.) Kütz. and in specific sites by Bangia atropurpurea (Roth) C. Agardh and Enteromorpha intestinalis (L.) Nees. Being rather abundant species in another sites of the Baltic Proper Pilayella littoralis (L.) Kjellm. it is described as rare.

Keywords: algae, distribution, the Baltic Sea, Lithuanian coastline.

During 1993–1997 in Eastern Lithuania two ecological groups of micromycetes were investigated: fungi growing on aboveground parts of terrestrial plants and aquatic mycobiota. From ca. 1000 herbarium specimens and 150 water samples 664 micromycetes species belonging to 206 genera and 8 classes were identified. 142 species were recorded for the first time in Lithuania. Most of the new species belong to Hyphomycetes class and Sphaeropsidales order (Coelomycetes) which show, that these fungi groups are still in need of thorough study. 700 plant species of various families hosting micromycetes species were recorded.

Keywords: Micromycetes, Chytridiomycetes, Hyphochytridiomycetes, Oomycetes, Zygomycetes, Ascomycetes, Basidiomycetes, Hyphomycetes, Coelomycetes, Lithuania.

Original data on new for Lithuania species of Septoria genus (S. alni, S. betulina, S. crepidis, S. dschungarica, S. gypsophilorum, S. helenii, S. laubertiana, S. socia, S. tabacina, S. ulmaria) are presented in this paper. Localities and host plants of rare species are given. Some new for these fungi host plants were revealed: S. dschungarica was found on Trollius europaea, S. gypsophilorum – on Gypsophila fastigiata and G. paniculata and S. helenii – on Helenium autumnale.

Keywords: Coelomycetes, Sphaeropsidales, Septoria, fungi, host plants, Lithuania.

Five new in Lithuania wood-inhabiting fungi species – Athelia salicum, Gloeocystidiellum porosum, Sistotrema brinkmannii, Tomentella crinalis, and Tubulicrinis accedens are described. These fungi were found in 1993–1997 in East Lithuania. Athelia salicum was growing on a thick decaying junk of willow (Salix sp.), at the lakeside, Gloeocystidiellum porosum – on a laying dry branch of hornbeam (Carpinus betulus), Sistotrema brinkmannii – on a rotten stump of deciduous tree, in an old park, Tomentella crinalis – on remains of a rotten stump of maple (Acer platanoides), Tubulicrinis accedens – on decaying wood of deciduous tree (elm or lime), also in an old park.

Keywords: wood-inhabiting fungi, new species, Lithuania.

Discussion about the Lithuanian name of the genus Aesculus is presented. There are two variants of the name with slightly different spelling, i.e. „kastonas” and „kastanas”. The first is in current use, however the author states that the second is more convinient for dendrologists.

Keywords: Aesculus, dendrology, common plant name, Lithuania.