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Abstrakty/Abstracts

Zprávy České botanické společnosti 51/2, 2016


Abstrakty/Abstracts

Dřevojan P. & Letz D. R.
Laskavec vykrojený (Amaranthus emarginatus) - nový druh květeny České republiky a poznámky k jeho výskytu na Slovensku, v Maďarsku a Rakousku
Amaranthus emarginatus - a new species to the flora of the Czech Republic and notes on its occurrence in Slovakia, Hungary and Austria

Abstract

Amaranthus emarginatus, a species of the A. blitum agg. was found new to the flora of the Czech Republic, where it occurs in two subspecies - A. e. subsp. emarginatus and A. e. subsp. pseudogracilis. The subsp. emarginatus is reported here as a taxon also new to Slovakia, Hungary and Austria. Amaranthus emarginatus has become a naturalized species in the Central European countries investigated over the past 30 years, colonizing mainly river banks and alluvial deposits. The majority of reported and studied individuals belong to subsp. pseudogracilis, which was documented from all these countries as early as in the 1980s. The first specimen of subsp. emarginatus was collected in 1994 and is very rare here. It grows mainly on banks of the Morava River in the Czech Republic, Slovakia and Austria, and was also discovered on the banks of the Danube River at a single site in Hungary. It is mostly found co-occurring with subsp. pseudogracilis, but slightly differs in its ecological requirements and has not been found in agricultural habitats. None of the mature specimens studied showed morphological transitions between A. blitum and A. emarginatus, neither between subspecies A. e. subsp. emarginatus and subsp. pseudogracilis.

Ekrt L.
Znovuobjevená kapradina bodlinkatá (Polystichum setiferum) pro květenu České republiky
Polystichum setiferum rediscovered for the flora of the Czech Republic

Abstract

Polystichum setiferum was rediscovered for the flora of the Czech Republic. Eight historical specimens were identified in the herbaria BRNM, BRNU, OLM, PRC, and ZMT. Credible historical records from the years 1881-1926 originate from Moravia: the Moravskoslezské Beskydy Mts. (Mt. Kněhyně and Mt. Smrk), Moravian Karst (Olomučany) and Jeseníky Mts. (Rýmařov, Mt. Praděd, Velká kotlina). An uncertain record was detected in Bohemia (Děčín, Růžovský vrch). The microcharacters (exospore length, stoma length) of these plants exhibit the same pattern as specimens of P. setiferum from Bulgaria, Romania and Serbia and they contrast with the morphologically similar P. aculeatum. The history or recognition of the species in the Czech flora is discussed and an identification key to P. aculeatum and P. setiferum is presented. The isolated occurrence of Polystichum setiferum in the Czech Republic represents the northernmost localities within its entire distributional range.

Kobrlová L., Hroneš M. & Trávníček B.
Rod Symphytum (kostival) v České republice. I. S. tuberosum agg.
The genus Symphytum (comfrey) in the Czech Republic. I. S. tuberosum agg.

Abstract

A review of genus Symphytum in the Czech Republic is presented, incl. an identification key and remarks on its distribution and ecology. The first part of this review is focused on the Symphytum tuberosum agg. This group is taxonomically difficult and includes high polyploids. Two dominant ploidy levels were found in the Czech Republic: tetraploid (S. tuberosum subsp. angustifolium) and dodecaploid (S. tuberosum subsp. tuberosum). S. tuberosum subsp. angustifolium shows clear affinity to the margins of the Pannonian basin and was found only in Moravia. The more common and widespread S. tuberosum subsp. tuberosum was demonstrated to occur in the entire country, but is almost absent from the Czech part of Carpathian Mts. A detailed overview of morphological characters useful for identification of these taxa, their ecological differentiation and distribution maps are presented.

Dřevojan P., Novák P. & Sádlo J.
Komentované fytocenologické snímky z České republiky. 1.
Commented phytosociological relevés from the Czech Republic. 1.

Abstract

This paper is the first set of a series of publications commenting on remarkable phytosociological relevés from the Czech Republic. It deaks with the following five vegetation types: (1) Calcareous Pinus sylvestris woodlands growing on limestone outcrops in the Moravian Karst and probably belonging to the Erico-Pinion alliance, comprising peri-alpidic calcareous pine forests, a vegetation type which is very rare in the Czech Republic. (2) Rare ruderal vegetation with a high cover of Chenopodium murale (Polygono arenastri-Chenopodietum muralis association) was recorded in south Moravia. (3) A ruderal community dominated by Tribulus terrestris and classified as the Tribulo terrestris-Tragetum racemosi association, was recorded in the city of Brno for the first time in the country. (4) Halophilous grassland of the Puccinellietum limosae association was recorded at a restored saline site named Zápověď near Terezín in south Moravia. (5) Species-poor vegetation dominated by the alien aquatic fern Azolla filiculoides, classified as the Ceratophyllo-Azolletum filiculoidis association, was recorded in Moravia for the first time.

Kubíková J.
Teplomilné stepi v Čechách - červená nit pražské botaniky
Thermophilous grasslands in Bohemia - scarlet thread through Prague botanical studies

Abstract

The history of botanical research into thermophilous grasslands in Bohemia from the beginning of the 20th century is followed. The research is documented from different time periods and different landscapes. A range of studies are discussed and biographies of the main authors are presented. A bibliography of unpublished dissertations and student theses deposited in the library of the Faculty of Sciences of Charles University Prague is included. The summarized results inform of flora and phytogeography, phytosociology, Holocene development, ecology and life strategies of grassland species. Thermophilous grasslands thrive on steep southern slopes of various rocks. They have been maintained by grazing and also susceptible to human impact, both directly and indirectly.