Vegetation of the Birjučij Island spit in the Azov Sea. Sand steppe vegetationDubyna, Dimitrij V.; Neuhäuslová, Zdenka; Šeljag-Sosonko, Jurij R.
doi: 10.1007/bf02813216pmid: N/A
The syntaxa of the near-natural sand steppes (classFestucetea vaginatae) and their substitutes due to trampling (Chenopodietea) were studied in 1991 during the Ukrainian-Czech expedition to the Birjučij Island Spit (Azov Sea, Ukraine). Within the allianceFestucion beckeriVicherek 1972 (classFestucetea vaginataeSoó 1968 emend.Vicherek 1972, orderFestucetalia vaginataeSoó 1957) three associations and five communities without rank are described, covering the vegetation variability along gradients of sand stabilization/soil development and salinization/moisture. Further, two associations of the classChenopodietea, due to deer influence, are described. Four associations (Centaureo odessanae-Stipetum capillatae, Poo bulbosae-Caricetum colchicae, Secali-Cynodontetum dactyli andHeliotropio dolosi-Brometum japonici) are described as new.
Salix silesiaca communities in the Fatra Mts. (Central Slovakia)Veselá, Monika
doi: 10.1007/bf02813218pmid: N/A
Two new associations belonging to theSalicion silesiacae within theBetulo carpaticae-Alnetea viridis are described. These are disclimax shrub communities dominated bySalix silesiaca at higher altitudes of the Fatra Mts. (Western Carpathians). Synmorphological, synecological, syntaxonomical, syngenetical and synchorological characteristics of the communities are given. Floristic differences between the montane shrub communities in the Western Carpathians and those in the Sudeten Mts. are summarized in a synthetic table.
Ecological requirements and recent European distribution of the aquatic carnivorous plantAldrovanda vesiculosa L.—A reviewAdamec, Lubomír
doi: 10.1007/bf02813219pmid: N/A
Aldrovanda vesiculosa, a critically endangered aquatic carnivorous plant, is a species rapidly vanishing from Europe. A map of its recent European distribution is given. Of its earlier distribution area covering a substantial part of Europe, only a few native sites in Hungary, Poland, Romania, Russia and Ukraine remain. On the basis of the literature, field research inAldrovanda habitats, and experience of its cultivation both in culture and in the field, its ecological requirements and habitat characteristics are reviewed. The most important requirements appear to be a high CO2 concentration, a medium concentration of humic acids in the water, warm water of high transparency, and a very low biomass of accompanying aquatic plants. The possibility of forming new substitute localities ofAldrovanda is discussed.
Studies on the cyanophytes (Cyanoprokaryotes) of Cuba 10. New and little known chroococcalean speciesKomárek, Jiří
doi: 10.1007/bf02813222pmid: N/A
Several little known or new species of chroococcalean cyanoprokaryotes (Cyanobacteria, Cyanophyceae) of the generaAphanothece (A. variabilis, A. comasii), Bacularia (B. gracilis), Cyanotetras (C. crucigenielloides) andCyanokybus (C. venezuelae) were found in Cuban freshwater reservoirs. Their taxonomic descriptions and comparison with related species are presented. The chroococcacean speciesCyanokybus venezuelae was originally described bySchiller (1956) from Islas de los Aves near the Venezuelan coast in the Caribbean Sea; it also grows in alkalic, coastal swamps and pools on Cuba. The morphology, variation and life cycle of Cuban populations of this little known species were studied, and its generic delimitation from the genusChroococcus was found to be taxonomically definable. The Cuban samples, which correspond morphologically and ecologically to the Venezuelan diagnosis, represent the second finding of this species after its description, again in the Caribbean region.
New foliicolous lichens from New Zealand 1Malcolm, William M.; Vězda, Antonín
doi: 10.1007/bf02813223pmid: N/A
Three species and one genus of theTrichotheliaceae are described as new and illustrated.Polycornum rubrofuscum gen. and sp. nov. is related to the generaPorina andTrichothelium, but differs in having complex horn-like appendages growing from the entire surface of its perithecia, giving them a tomentose appearance.Trichothelium rubellum is characterized by red or brown perithecia and 5–7 white membranaceous setae arranged in a star pattern around the ostiole.Trichothelium nanum is characterized by 3-septate spores, small black perithecia, and white setae.
Pollen analysis of dust preserved in four medieval booksJankovská, Vlasta
doi: 10.1007/bf02813224pmid: N/A
Pollen spectra of three samples of dust taken from four medieval books are reported. The books, printed A.D. 1500–1530, were preserved in the Franciscan monastery of Kadaň (NW Bohemia) up to c. 30 years ago, and thereafter in Prague. Sample 1 contains rather few pollen grains, most of which are derived from cereals, probably from pastries or bread. Sample 2 is rich in pollen, containing abundant tree pollen, mainlyQuercus andFagus, indicating that the dust indeed comes from NW Bohemia rather than from Prague. Its overall pollen spectrum also corresponds well to published data from medieval forests and the cultural landscape of the region. The spectrum of sample 3 (two books) is rather rich in pollen, mainly of synanthropic plants. The remarkably high pollen numbers of cultivated plants (Sambucus nigra, Lathyrus type andSymphytum) are still unexplained.