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Abstrakty/Abstracts

Zprávy České botanické společnosti 45/1, 2010


Abstrakty/Abstracts


Trávníček B.
Ladoňky (rod Scilla s. lat.) v České republice. I. Původní taxony
Squills (Scilla s. lat.) in the Czech Republic. I. Native taxa

Abstract
The taxa of the genus Scilla L. in the Czech Republic are reviewed. Three species (S. kladnii Schur, S. vindobonensis Speta and S. bifolia L.) are native to the Czech Republic. Within S. bifolia, four subspecies are recognized: subsp. bifolia, subsp. buekkensis (Speta) Soó, subsp. spetana (Kereszty) Trávníček, and subsp. rara Trávníček. An identification key to the mentioned taxa is provided. Dot maps of the distribution and lists of localities are presented for all taxa. Scilla kladnii occurs in the eastern part of the Czech Republic only (mainly along the Bečva river, between the towns of Vsetín and Kroměříž). Its habitats extends from the lowlands to the upper colline belt, at altitudes ranging from 190 m to c. 340 m. Scilla vindobonensis has been recorded in relatively warm regions of both Bohemia and Moravia. In Bohemia it occurs most often in the lower reach of the Ohře river and scattered in the České středohoří range. In Moravia, this species grows scattered in the lower reach of the Dyje river and in the southern part of the Bílé Karpaty range. Isolated localities are also known from C and E Bohemia and from SW and C Moravia. Localities of S. vindobonensis are situated from the lowlands to the upper colline belt, at c. 120 to c. 590 m above sea level. Scilla bifolia subsp. bifolia occurs rarely in the eastern part of the Elbe river basin (east of the town of Kolín), in SW Moravia (between the towns of Třebíč and Moravský Krumlov) and in C Moravia (west of the town of Olomouc). It grows from the lowlands to the upper colline belt at altitudes of 200 to c. 480 m. Subsp. buekkensis is distributed only in SE Moravia between the towns of Uherské Hradiště and Uherský Brod. The localities are found in the colline belt, rarely in the lowland belt, at altitudes of 177 to 340 m. Subsp. spetana occurs in S Moravia (in the surroundings of the village of Mikulčice close to the town of Hodonín and southeast of the town of Břeclav) and in C Moravia (two nearby localities southwest of the town of Kroměříž). The altitudinal range of the subspecies extends from the lowlands to the colline belt, between altitudes of c. 150 and 320 m. The endemic subsp. rara has been found at a single locality in SW Moravia northeast of the town of Znojmo at an altitude of c. 310 m.

Ekrt L., Štech M., Lepší M. & Boublík K.
Rozšíření a taxonomická problematika skupiny Dryopteris affinis v České republice Distribution and taxonomy of the Dryopteris affinis group in the Czech Republic

Abstract
The distribution of taxa of the Dryopteris affinis group in the Czech Republic was studied. Collections of 25 Czech public herbaria were revised and a total of 373 specimens were examined. Two species, D. borreri and D. cambrensis, and one hybrid, D. × critica (D. borreri × D. filix-mas), were recorded in the Czech Republic. D. cambrensis was recently rediscovered for the flora of the Czech Republic after more than 30 years and was recorded as a new species to Bohemia. Twenty-eight localities of the rare D. cambrensis are known from the Czech Republic. A single locality of D. cambrensis was found in Poland in the surroundings of the village of Pstrążna near the border with the Czech Republic. An overview of the morphological characters and habitat preferences, distribution maps, the total distribution of the taxa and an identification key are presented.

Štefánek M. Poznámky k rozšíření některých vzácnějších druhů polních plevelů v severní části středních Čech
Notes on the distribution of some rare weeds in the northern part of central Bohemia

Abstract
An overview of recent localities of rare or endangered weeds found in the northern part of central Bohemia in the years 2001-2008 is given. New localities of several critically endangered species were found: Adonis flammea, Bupleurum rotundifolium, Conringia orientalis, Erysimum repandum, Galium tricornutum, Glaucium corniculatum, Misopates orontium, Nigella arvensis. Short comments on their ecology and distribution are added.

Kubát K.
Struktura populací Rhamnus cathartica na dvou lokalitách v Lounském středohoří
Population structure of Rhamnus cathartica at two localities in the Lounské středohoří Mts

Abstract
Two populations of Rhamnus cathartica were studied on stony walls at the foot of the Oblík and Brník hills in the Lounské středohoří Mts. Shrub branches or small trunks with a circumference of 57-73 cm are approximately 57-74 years old. Vegetative spreading through root-suckers was not confirmed.

Nová J. & Karlík P.
Vegetace zaniklých středověkých vesnic Kozelského polesí (Plzeňsko)
Vegetation of deserted medieval villages in the Kozel forest district (Pilsen region)

Abstract
Two currently wooded, deserted medieval villages in Western Bohemia dating from the 10th to the 15th century were studied in order to establish the possible impact of medieval land-use on present-day forest vegetation, especially on the differences between former built-up (urban) areas and neighbouring agricultural (rural) areas. We made small phytosociological relevés and used them in ordination and statistical analyses. Environmental data (Ellenberg's indicator values) were also extracted from the species data. In the village of Javor, covered by species-rich oak-hornbeam forest, we found differences in species richness between 3 land-use categories: urban, rural in protected area and rural outside protected area. We also encountered a slight tendency to a higher nutrient content and soil reaction and lower light intensity under the canopy in the urban area. We interpret this as a persisting influence of the medieval management, although the relationship between history, soil characteristics and recent vegetation are rather complicated. This, however, goes beyond the scope of this research. In the village of Dolní Neslív, planted with spruce monoculture, the differences were less clear, which is probably connected with different recent forest management at this locality and the small number of phytosociological relevés. In both villages, we also recorded some ancient forest species (16 in Javor, 3 in Dolní Neslív). Environmental conditions in the deserted villages may be suitable for these species, but we do not consider at least some of these species to be very good indicators of continuous forests in Central Europe. On the other hand, Vinca minor is an indicator of abandoned settlements; in the village of Javor it is probably a relict of medieval gardening.