L. Hably szerk.: Studia Botanica Hungarica 19. 1986 (Budapest, 1986)

Szerdahelyi, Tibor: Rare ferns of Hungary IV. Woodsia ilvensis in the Bükk National Park

STUDÏA BOTANICA HUNGARICA (Antea: Fragmenta Botanica) XIX. 1986 p. 93-98 Rare ferns of Hungary IV. Woodsia ilvensis in the Bükk National Park By T. SZERDAHELYI (Received November 30, 1985) Abstract: Woodsia ilvensis (L.) R. Br. occurs on the north-western slope of the "Várhegy" in the vicinity of Szarvaskő in the Biikk National Park. The results of cenological investigations are presented. Woodsia ilvensis is known from one locality in the Biikk National Park near the village Szarvaskő, on the slope of the "Várhegy" hill. Other localities in Hungary are in the Börzsöny Mountains (KÁRPÁTI 1935), the Mátra Mountains and in the Zemplén Mountains. All the localities are isolated in Hungary. Its occurrence is sporadic in the Carpathians as well. It has a vast range in North America, Greenland, Scandinavia and Asia (see map). The vegetation on silicate (gabbro) soil includes several rare plants besides Woodsia ilvensis

, such as Sesleria heufleriana

. Dictamnus albus

, Carex brevicollis

, Saxifraga paniculata

, Minuartia frutescens

. Asplenium septentrionale

. MATERIAL AND METHOD The cenological investigations were carried out from May 1983 to June 1985. Thirty-nine 2 by 2 m sample plots were taken. The cover values according to the BRAPN-BLANQPET (1964) scale were assigned to the species (see Table). Exposition of the slope was north-west or north-northwest, with a gradient of 60-70°. The distributions of the floral elements, life-forms and cenological characters of the species list may be seen in Fig. 1 and the ecological indexes are depicted in Fig. 2. These are: R (soil requirement), T (temperature requirement), F (water requirement) and N (nitrogen requirement). We used these indexes as given by SOÓ (1964-80) and PRISZTER (1985). RESULTS Woodsia ilvensis is the characteristic member of these pioneer silicate rock grass communities. First ZÓLYOMI (1936) and SOÓ (1937) presented data on the silicate plant associations of Szarvaskő, in our sample plots 12 plant species occured from the 22 character species mentioned by SOÓ (1941) for the Asplenio-Festucion glaucae group. This rock cleft community belongs to the Asplenio septentrional!-Melicetum ciliatae association. The floral elements are distributed as follows: mainly Mediterranean, sub-Mediterranean, Eurasian and Pannonian elements form the slope vegetation. The presence of the Carpathian elements is also noteworthy. The life-form distribution is the following: hemic ryptophytes, chamaephytes and geophytes