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Abstrakty/Abstracts

Zprávy České botanické společnosti 46/1, 2011


Abstrakty/Abstracts

Chlumský J. & Štech M.
Rozšíření černýše českého (Melampyrum bohemicum) v České republice a na Slovensku - revize po čtyřiceti letech
Distribution of Melampyrum bohemicum in the Czech Republic and Slovakia - revision after fourty years

Abstract
Because of uncertainty about the present extent of Melampyrum bohemicum populations in the Czech and Slovak Republics and alarming information about the withdrawal of populations from their localities, a complete revision of all historically reported localities was carried out. The aim of the survey was to determine the range and size of all recent populations for future comparison. The revision was based mainly on the paper by Prof. Emil Hadač (Hadač 1966), who gathered old herbarium data. New data from recent botanists were added. During the revision M. bohemicum was found at 50 localities consisting of 76 populations. The species was not found at twenty historical localities. Some recent knowledge about the biology and taxonomy of M. bohemicum is compared with Hadač (1966).

Sádlo J., Petřík P., Boublík K., Rychtařík P. & Šímová I.
Diverzita rostlinstva Hradčanských stěn (Dokesko) a její příčiny
Habitats, vegetation and flora of the Hradčanské stěny rocks (Doksy region, northern Bohemia): causes of diversity

Abstract
The flora and its environmental determinants (i.e. spatial pattern, area, geomorphological features of sandstone rocks and indicator values of vascular plants) in the area of the Hradčanské stěny rocks (Kummergebirge in German literature, northern Bohemia, Czech Republic) were studied. The study site has been acknowledged as a unique area from the conservation point of view (27% of the rock flora consists of Red List species), biogeographic position (meeting point of species representing various floristic distribution ranges), history (the area was only temporarily settled) and geomorphological and geological diversity (sandstone pseudokarst). The basicity of the rocks was shown to be the most important factor in species distribution. Temporal changes were assessed based on comparison of a recent floristic survey with older botanical works. It seems that many ruderal species appear in the current flora as a result of human pressure. Some conservation management to prevent increasing erosion of rocks is recommended and legislative protection is urgently needed.

Koutecký P.
Nález vítodu douškolistého (Polygala serpyllifolia) v jižních Čechách
New occurrence of Polygala serpyllifolia in South Bohemia, Czech Republic

Abstract
Two new localities of Polygala serpyllifolia, a critically threatened species of the Czech flora, were found in the surroundings of the town of Ledenice, South Bohemia. They belong to the easternmost occurrences of this species and are isolated from the nearest recent occurrence in the Oberpfälzer Wald Mts. (Germany) by about 190 km to the southeast and from the nearest historical localities in the Žďárské vrchy Hills (Czech Republic) by about 125 km to the southwest . Both localities are most probably of recent origin. At both localities the species grows on abandoned forest roads in open acidophilous vegetation with Agrostis capillaris, Anthoxanthum odoratum, Avenella flexuosa, Calluna vulgaris, Carex pilulifera, Festuca ovina, Potentilla erecta, and Vaccinium myrtillus, which represents the plant assemblage typical of this species.

Danihelka J.
Znovu o rozrazilu pamětníkolistém, Veronica acinifolia
Veronica acinifolia revisited

Abstract Veronica acinifolia has been repeatedly reported as an alien species of the Czech flora. These reports are based on a short study by M. Smejkal published in this journal in 1970. The corresponding herbarium specimen, a single tiny plant originally identified as V. verna and since the 1920s deposited at BRNU, was collected in 1908 by F. Sedláček near Černošice in central Bohemia. It was later revised as V. acinifolia by E. Lehmann, but this rather remarkable record remained neglected until 1970. However, a careful inspection of the specimen has shown that the dwarfy plant unambiguously represents V. triphyllos. Consequently, for the time being, V. acinifolia should be excluded from the list of alien species of the Czech flora.

Hadinec J. & Lustyk P.
Additamenta ad floram Reipublicae Bohemicae. IX.
Additions to the flora of the Czech Republic. IX.

Abstract
This ninth part of floristic contributions includes newly published data of critically endangered species and data unpublished so far. Data of taxa newly discovered on the territory of the Czech Republic (Brachypodium rupestre, Epipactis futakii, E. leptochila subsp. leptochila, Potamogeton × schreberi and Rubus passaviensis) and data of alien species found in the Czech Republic for the first time (Digitaria ciliaris, Geranium purpureum and Gratiola neglecta) are summarised. The species Potentilla psammophila described from the Czech Republic as new to science in 2009, is also listed below. Furthermore, critically endangered species (according to the Black and Red List of Vascular Plants of the Czech Republic) are reported from new sites (e. g. Chimaphila umbellata, Cimicifuga europaea, Dryopteris cristata, Eleocharis quinqueflora, Epipactis greuteri, E. leptochila subsp. neglecta, E. microphylla, E. pontica, E. tallosii, Equisetum variegatum, Eriophorum gracile, Euphrasia slovaca, Filago lutescens, F. vulgaris, Galium tricornutum, Gentianella praecox subsp. bohemica, Geranium divaricatum, Goodyera repens, Hippocrepis comosa, Lathyrus heterophyllus, Malaxis monophyllos, Moneses uniflora, Ophrys apifera, O. holosericea subsp. holubyana, Orobanche picridis, O. purpurea subsp. bohemica, Orchis tridentata, O. ustulata, Pyrola chlorantha, P. media, Thalictrum simplex subsp. galioides, Thesium dollinerii, Trifolium striatum, Utricularia bremii). Finally, less rare and threatened species are mentioned from areas where they had not been recorded so far.

Gonda M. & Dítě D..
Ekológia a cenológia ostrevky slatinnej (Sesleria uliginosa) na Slovensku a jej porovnanie so stavom v Českej republike
The ecology and coenotic characteristics of Sesleria uliginosa in Slovakia and its comparison with a situation of this species in Czech Republic

Abstract
This article deals with the distribution, state and classification of communities with Sesleria uliginosa in Slovakia and compares it with the communities in the Czech Republic. There is a significant difference between mire vegetation with Sesleria uliginosa in these two countries. In Slovakia it belongs most often to the Caricion davallianae alliance, whereas in the Czech Republic it is classified in the Molinion caeruleae alliance. Syntaxonomic revision of the data from Slovakia proved that there is no difference between the Seslerietum uliginosae and Caricetum davallianae associations from the point of view of floristic composition or ecology. The same holds for data from the Czech Republic, where the vegetation with Sesleria uliginosa cannot be defined as a separate association within the Molinion caeruleae alliance and belongs to the Molinietum caeruleae association. Sesleria uliginosa has a wide ecological amplitude with respect to moisture gradient. In Slovakia the species occurs in waterlogged mire vegetation of the association Caricetum davallianae, in various types of meadows, as well as in dry grasslands of the Bromion erecti alliance.