Występowanie zanokcicy niemieckiej Asplenium x alternifolium Wulfen na Pogórzu Kaczawskim i Wałbrzysko-Bolkowskim
Journal Title: Przyroda Sudetów - Year 2017, Vol 20, Issue
Abstract
The occurrence of Asplenium ×alternifolium Wulfen in the Kaczawskie and Wałbrzysko-Bolkowskie Foothills The distribution of inter-specific hybrids of the genus Asplenium in Poland is still poorly known. The most common is A. ×alternifolium Wulfen (A. germanicum Weiss.), a hybrid of A. septentrionale × A. trichomanes, with a few dozen records in the Sudetes and a few in the Carpathians. In the Kaczawskie and Wałbrzysko-Bolkowskie Foothills it was recorded from a total of 22 localities, 17 till 1945, 6 after 1990; 4 of those were found during the studies presented here: 1 in the Kaczawskie Foothills, 3 in the Wałbrzysko-Bolkowskie Foothills. The parent species of the hybrid have different ecological requirements, their common habitats are partly insolated basalt and greenstone rocks (60% of localities). The disappearance of the hybrid’s localities is most probably a result of climate changes which cause separation of the parent species. A. trichomanes, still not endangered, is retreating to shaded habitats while A. septentrionale, which does not tolerate strong shadiness, started to become extinct in the second half of the 20th c. – the open habitats of insolated half-shaded rocks became too dry. A. ×alternifolium is less drought-resistant than A. septentrionale, resulting in the existing specimens dying out without being replaced by new plants. A full list of localities of A. ×alternifolium in the Kaczawskie and Wałbrzysko-Bolkowskie Foothills, as well as an identification key, are provided.
Authors and Affiliations
Ewa Szczęśniak
Keywords
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