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Abstrakty/Abstracts

Zprávy České botanické společnosti 43/1, 2008


Abstrakty/Abstracts

Danihelka J.
Hvězdnice sivá (Aster canus), Christian Ferdinand Hochstetter a dva málo známé prameny ke květeně Moravy
Aster canus, Christian Ferdinand Hochstetter and two less known sources of information on the flora of Moravia

Abstract
The only record of the halophilous species Aster canus known from the current territory of the Czech Republic was published by Christian Ferdinand Hochstetter (from 1817 to 1824 serving as a Lutheran minister in Brno) in the botanical journal Flora (Regensburg) in 1825. The species was reported to grow in a small wood adjacent to the former Měnín Lake near the village of Měnín (Mönitz) southeast of Brno. The lake, with saline water, was drained shortly afterwards. Since then, the occurrence of A. canus has never been confirmed although it was repeatedly searched for by Moravian 19th-century botanists, e. g., A. Makowsky, and no herbarium specimen is known to exist. The species has been considered vanished but some doubts still existed about its former presence. Recently, two other literature reports, both written and published by Hochstetter in 1823, were found, containing information on a less known exsiccate series, "Gewächse des Brünner Kreises", consisting probably of 500 species, further a list of species of the Moravian flora and also records of A. canus. A subsequent search in the WU-Keck herbarium, renowned for very old herbarium specimens and original material, yielded a specimen of A. canus collected by Ch. F. Hochstetter near Měnín in 1824 or somewhat earlier, confirming its indigenous status in the Moravian flora. Attention is also paid to the exsiccates cited, including a species list of the first centuria (see Appendix 1) and another list of 67 species (see Appendix 2) probably issued in the second to fifth centuriae, and to other Hochstetter's collections from southern Moravia.

Ekrt L.
Rozšíření a problematika taxonů skupiny Asplenium trichomanes v České republice
Distribution and problematic of taxa of the Asplenium trichomanes group in the Czech Republic

Abstract
The distribution of taxa of the Asplenium trichomanes group in the Czech Republic was studied. Collections of 32 public herbaria were visited and a total of 1477 specimens examined. The four taxa A. trichomanes subsp. trichomanes, A. trichomanes subsp. quadrivalens, A. trichomanes subsp. pachyrachis, A. trichomanes subsp. hastatum and four hybrid combinations were recorded from the Czech Republic. An overview of morphological characters, distribution maps and a brief summary of habitat preferences and total distribution of the taxa are presented.

Trávníček B. & Štěpánek J.
Nové nebo méně známé druhy Taraxacum sect. Ruderalia nalezené ve střední Evropě
New or less known species of Taraxacum sect. Ruderalia found in Central Europe

Abstract
Distribution, incl. exhaustive surveys of localities and dot maps, and diagnostic and ecological notes on five species of Taraxacum sect. Ruderalia in the Czech Republic and adjacent countries are presented, based on field investigation and taxonomic revision of relevant type material. Two species, Taraxacum praestabile Rail. and T. verticosum Rail., both described from Finland probably as temporarily occurring aliens after WWII, were recognized as native members of the Central European flora. Taraxacum praestabile Rail. 1962 was found at over 90 localities in the Czech Republic and at two localities in Slovakia (Fig. 6). Based on an evaluation of the morphological plasticity of the plants collected in C Europe (see Figs. 2-4), the name T. tumentifrons Rail. 1964 has been proposed as its synonym. T. verticosum Rail. 1962 is in the Czech Republic (Fig. 11) mainly distributed in the Šumava (Böhmerwald) Mts., one locality was found in Austria, another one in Germany. The characteristic form of its leaves and the position of its outer involucral bracts (Figs. 8-10) facilitate identification of the species in the field, and have permitted to include the name T. laniatum Rail. 1964 as a synonym. The three remaining species are newly accepted taxa, formally described elsewhere, all presumable endemics of Central Europe. Taraxacum clarum Kirschner, Štěpánek & Trávníček seems to be distributed in warm regions of the Czech Republic (c. 200 localities recorded, see Fig. 1), and has found once in Slovakia. The most abundant species among the taxa investigated in this paper is T. urbicola Kirschner, Štěpánek & Trávníček. It has almost 500 localities in the Czech Republic (Fig. 7) and the species is also known from Germany (Uhlemann 2003: 57, as T. aequilobum agg., type B) and from Poland (/Ollgaard et al. 2002: 33, 34). In our survey 5 additional records from Poland and 13 from Slovakia are presented. Taraxacum violaceifrons Trávníček inhabits relatively warm and dry regions mostly in the eastern part of the Czech Republic, growing often together with populations of diploid sexual plants of T. linearisquameum. The list of localities numbers nearly 300 finds from the Czech Republic, 16 from Slovakia and two from Poland (Fig. 12).

Zelený D.
Lesní vegetace v údolí Vltavy severně od Zlaté Koruny (okres Český Krumlov)
Forest vegetation in the Vltava river valley north of Zlatá Koruna (district of Český Krumlov)

Abstract
The aim of this study is to provide a phytosociological description of natural and semi-natural forest vegetation in a part of the deep valley of the Vltava river between Zlatá Koruna and Boršov nad Vltavou. A total of 173 phytosociological relevés have been recorded and classified into 16 vegetation associations or communities, which have been supplemented with lists of diagnostic, constant and dominant species and a brief description of ecological characteristics and relationships to other syntaxa. Approximately 20% of relevés remained unclassified. Unconstrained ordination (non-metric multidimensional scaling) with supplementary projection of Ellenberg indicator values was used to describe ecological relationships between vegetation types in the valley. The concept of classification of selected vegetation units is discussed and comments on nature conservation strategy are given. The study contains tables of all original phytosociological relevés and results of soil chemical analyses.

Karlík P.
Botanicko-ochranářské exkurze v rámci česko-německé spolupráce
Botanical-conservational excursions under a Czech-German collaboration programma

Abstract
With support from Interreg IIIA two excursions were organized. The first one was held in Bavaria and second one in the Czech Republic. The exkursions were botanically oriented with a nature protection focused.
Štefánek M. & Štěpánková R.
Zpráva o činnosti České botanické společnosti za rok 2007 2007 Czech Botanical Society Annual Report