Somogyi Múzeumok Közleményei 16. (2004)

Lájer Konrád: A rejtőke (Teesdalia nudicaulis) előfordulása és a belső-somogyi ezüstperjés gyepek mai állapota

263 The occurrence of Shepherd's Cress (Teesdalia nudicaulis) and the recent status of Grey Hair-grasslands in 'Belső Somogy KONRÁD LAJER The recent status of grasslands on acid sandy soils in the region 'Belső Somogy' (South-West-Hungary) are treated by the Zurich-Montpellier methodology. Relevés with a clear dominance of Corynephorus canescens are related to the association Thymo angustifolii-Corynephoretum canescentis Krippel 1954. Shepherd's Cress occurs mainly in this community characterized also by the greater importance of other pioneer species as Filago minima, Spergula pentandra, Veronica dillenii. Stands dominated at least partially by Festuca vaginata subsp. dominii correspond to the association Festuco dominii-Corynephoretum Borhidi (1958). For a differentiation from the previous community can serve also Petrorhagia saxifraga to some extent. The number of species per relevé is generally greater here. It presumably represents a somewhat later stage of secondary succession. Unpublished localities of Teesdalia nudicaulis near the villages Bolhás and Kőkút are described. Around randomly selected Teesdalia nudicaulis specimens in the Kőkút area the minima of the nearest neighbor distances for several species are as follows: Thymus serpyllum 0.5 cm, Ambrosia artemisiifolia, Teesdalia nudicaulis 1 cm, Conyza canadensis (only once) 1 cm, Corynephorus canescens, Filago minima 2 cm, Luzula campestris 3 cm, Hypochoeris radicata, Spergula pentandra 4 cm, Veronica dillenii 5 cm, etc. See table 3 for further details. In a dense population of Teesdalia nudicaulis the nearest neighbor species regardless of their distances were recorded along a transect. The results are summarized in table 4.