B. Papp szerk.: Studia Botanica Hungarica 39. 2008 (Budapest, 2008)

Bauer, N., Lőkös, L.; Papp, B.: Distribution and habitats of Cardaminopsis petraea in Hungary

(BUDAI and SCHAREK 2005), mainly on the vertical rocky wall, in chasm vegetation (Table 1: 1-10). This vegetation on the basis of its species combination is considered an association variant of Alysso saxatilis-Festucetum pallentis Klika ex Cerovsky 1949 corr. Gutermann et Mucina 1993 (see MUCINA and KOLBEK 1993). The occurrence of this association in the Csobánc Hill and its description on the basis of species frequency was given by CSIKY (2003), and Csiky in BORHIDI (2003), without Cardaminopsis petraea. Cardaminopsis petraea also grows on the rocks of the debris slope forest (Mercuriali-Tilietum Zólyomi et Jakucs in Zólyomi 1958) under the rocks, and some of its stems were also observed in the rocky grassland of the west-facing slope. The occurrence of the plant on secondary surfaces, i.e. built stone walls, is rather rare in Central Europe (BRANDES 1992). For this reason, it is especially interesting that it occurs with high density as other rocky grassland species on the Csobánc Hill on the northern side of one of the ruined castle walls (Table 1: 11-20). Of the dominant species of the Alysso saxatilis-Festucetum pallentis association on Csobánc Hill, Allium senescens subsp. montanum, Aurinia saxatilis, Festuca pollens, Jovibarba birta, Seseli osseum, Asplenium septentrionale, Campanula rotundifolia are typical in the habitats of Cardaminopsis petraea. Further notable elements of the rocky vegetation are Saxifraga paniculata, Ceteracb officinarum, Galium austriacum, and Asplenium ruta-muraria is also frequent on the castle wall. Cardaminopsis petraea is found in the greatest density on the castle wall. Observations of relatively great density of this species have been reported from secondary habitats; Hemp's hypothesis (HEMP 1996) about the recent expansion of Cardaminopsis petraea is based on this phenomenon. The composition of the lichen species found in the studied quadrates (Csobánc, relevés 1-20) represents a typical, acidic rocky lichen community with dominance of Acarospora fuscata, Aspicilia cinerea, Candelariella vitellina, Lecanora rupicola, Pertusaria lactea, P. leucosora, Rbizocarpon geographicum, Rh. lavatum and Scoliciosporum umbrinum (Table 3). Micarea botryoides (in relevés 1-10) is new for Hungary. At this place there is the 2nd, confirmed Hungarian occurrence for Toninia aromatica (in relevés 11-20 situated in the castle wall). Its first published occurrence from Lipótmező (SÁNTHA 1910, SZATALA 1942) is dubious in lack of the specimen. Another specimen from the Bükk Mts (collected by F. Fóriss) was revised later as Scoliciosporum umbrinum, thus the other (only former) confirmed