Botanica Lithuanica , Volume 14, Number 1

2008 m.

This study concerns ecological, morphological and anatomical characteristics of Heracleum platytaenium which is a monocarpic and also an endemic species in the Central Black Sea region of Turkey. N, P dynamics in stem, leaves and roots, morphological and anatomical characters, and soil properties along an elevation gradient were investigated. N and P concentrations varied along the elevation gradient and during the growing season in both basal and stem leaves. N concentrations of root, stem and flower did not change significantly during the growing season, although significant changes were observed along the elevation gradient. N concentrations of roots and stems increased, although N concentrations of flowers declined along topographic gradient. P concentrations also varied along the elevation gradient and during the growing season in root, stem and flower. There are secretory cavities in stem and petiole. Vascular bundles are arranged in two lines in the petiole. There are 11 bundles in outer line and 4 bundles in inner line. The basal leaf is dorsiventral. The cauline leaf has homogeneous mesophyll. Stomata type is anomocytic in both basal and cauline leaves.

Keywords: nitrogen, phosphorus, dynamics, Heracleum platytaenium, morphology, anatomy, monocarpic plant.

This paper contains a list of 218 taxa of macroalgae (excluding cyanobacteria and diatoms) occurring in Lithuanian fresh and brackish waters and terrestrial habitats. There are 2 taxa belonging to Bangiophyceae, 28 taxa – to Florideophyceae, 11 taxa – to Phaeophyceae, 11 taxa – to Xantophyceae, 2 taxa – to Treuboxiophyceae, 28 taxa – to Ulvophyceae, 46 taxa – to Chlorophyceae, and 90 taxa – to Charophyceae. Data on 93 species are supported by herbarium specimens deposited in WI and BILAS herbaria. Species, their synonyms, habitats, conservation status in the country, and references are presented in the paper.

Keywords: macroalgae, checklist, Lithuania, occurrence, threatened species.

The paper presents the results of lichenological investigations during the workshop of Nordplus Neighbour programme in Biržai in 2006. 103 species are dealt with. Cheiromycina petri, Melanelia infumata, Thelotrema petractoides, Xanthoparmelia plitii and Halecania spodomela are recorded for the first time in the eastern and south-eastern parts of the Baltic region. Micarea tuberculata is recorded for the first time in the Baltic States. New for Lithuania lichens are: Absconditella delutula, Agonimia gelatinosa, Buellia erubescens, Lecidella pulveracea, Opegrapha viridis, Parmelia ernstiae, Parmeliella triptophylla, Peltigera collina, Protothelenella spinctrinoides, new lichenicolousfungi are: Cercidospora epipolytropa, Graphium aphthosae, Lichenostigma cosmopolites, L. rugosum, Phaeosporobolus usneae, Stigmidium pumilum, S. xanthoparmeliarum. Biatora meiocarpa, Leptogium saturninum, Mycobilimbia tetramera and Ochrolechia pallescens were re-found in Lithuania for the first time since the first part of the 20th century. Nephroma resupinatum was re-found for the first time since the 19th century.

Keywords: lichens, lichenicolous fungi, Lithuania.

The paper presents results of the research on the very poorly known lichen in Poland, Cladonia stygia (Cladoniaceae, lichenized Ascomycota). In the past C. stygia was mistaken for C. rangiferina because of the same chemistry and similarity in morphology, thus the status and distribution of the species remains unknown. At present, C. stygia is known in the southern as well as the northern parts of the country where it has not been reported before. Information on the habitat requirements and general distribution are also provided.

Keywords: Cladonia, Cladonia stygia, distribution, habitat requirements.

Achlya anomala sp. nov. is described from acetate sheets put in Las Cańas stream as a substratum, in Buenos Aires Province (Argentina). The species is illustrated and compared with other species of the genus; it develops characteristic large swellings like anomalous oogonia intermingled with the normal ones, often one or several times proliferating, with or without oospores inside. The oogonia are smooth or with scanty papillate or tuberculate projections; the antheridial branches are usually diclinous, often monoclinous and rarely androgynous; oospores are eccentric, (1)2–12(20) per oogonium.

Keywords: Achlya, taxonomy, straminipilous fungi, freshwater.

The isolate of seed-borne virus was separated from Petunia hybrida seedlings showing symptoms of vein necrosis. Electron microscopy revealed bacilliform particles of four main sizes ranging from 30 to 60 nm. Test-plants’ local and systemic reactions were characteristic of Alfalfa mosaic alfamovirus (AMV). AMV identification was confirmed by a positive reaction in DAS-ELISA assay and obtaining specific for this virus amplification products in RT-PCR.

Keywords: Petunia, Alfalfa mosaic virus, identification, DAS-ELISA, RT-PCR.

Najas tenuissima (A. Braun) Magnus – a very rare and relict macrophyte species is reported for the first time in the flora of vascular plants of the Baltic Countries. It was found in August, 2006 in an eutrophic freshwater Lake Ārdavs in the very South-East of Latvia.

Keywords: macrophytes, Najas tenuissima, vascular plants, flora, lakes, Latvia.

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