L. Hably szerk.: Studia Botanica Hungarica 19. 1986 (Budapest, 1986)
Szerdahelyi, Tibor: Rare ferns of Hungary IV. Woodsia ilvensis in the Bükk National Park
Silicate grass vegetation are the xerophilous ferns ( Woodsia ilvensis an d Asplenium septentrionale ). The microhabitat of Woodsia ilvensis l ies in between the little rock clefts and the unbroken rock grass layer. The clefts are occupied by Asplenium septentrionale everywhere. The large, cavernous fissures are taken up mainly by Minuartia frutescens . Sempervivum hirtum. Seseli osseum , Koeleria cristata , Festuca pallens and Potentilla arenaria . Woodsia is unable to work its way into the mat made up of grass-forming species, e.g. the fern is not competitive with the Thymus spots. Woodsia ilvensis is at competitive advantage in fissure of exposition and size larger than needed bv Asplenium septentrionale , but smaller than needed by the grass-forming species. If the fissure is too large and/or the gradient of the slope is about 90-100°, the less xerophilous Asplenium trichomanes or Cystopteris fragilis occupy the space. From the point of view of drought resistance, a decreasing order of Asplenium septentrionale - Woodsia ilvensis - Cystopteris fragilis - A splenium trichomanes may be established. The other Hungarian habitats of Woodsia ilvensis are probably different from this plant community. Fig. 2. Distribution of the R, T, F, N values Table 1. Species m p 1 1-10 11 2i) 21 8 0 31 - 39 Ajuga genevensis Allium flavum Asplenium septentrionale Asplenium trichomanes Artemisia campestris + + + + + + + 11 ++ + + ++++++++1+ +++++++++ ++++++++ ++++ +++ 1 + + + + + + +