B. Papp szerk.: Studia Botanica Hungarica 29. 1998 (Budapest, 1999)

Erzberger, Peter: Distribution of Dicranum viride and Dicranum tauricum in Hungary

appear, these regions have therefore to be excluded from the area of D. viride. Except for the record from Nyírség, where D. viride was discovered in 1989, and the 3 recent records from the Bükk Mts, all records of D. viride are 30 years old or older. D. tauricum, on the other hand, is reported in this paper from the following regions: Bükk (3; 1968), Börzsöny (2; 1996), Pilis (1 ; 1997), Buda Mts (4; 1998), Nyírség (5; 1998), Maros-Körös köze (1; 1998) and Mecsek (1; 1953). The literature record of the Zemplén Mts corresponds to specimens revised erroneously as D. tauricum by L. Vajda in 1969 and published in BOROS and VAJDA (1970). It represents a specimen of D. viride, as was already observed by E. Hegewald in 1971. Hence, at present, there is no specimen of D. tauricum available from the Zemplén Mts. In contrast to most records of D. viride, those of D. tauricum are fairly recent. Figure 1 shows the distribution of the two species in Hungary according to the specimens seen by the author. Distinction between Dicranum viride and Dicranum tauricum D. viride and D. tauricum have often been confused, even recently, although the differences are quite pronounced. For this reason, the characters useful for correct determination are presented here. Dicranum viride Dicranum tauricum Length of cells above angular cells (ignore 3 rows of cells adjacent to the nerve, the margin and the auricles, each) (14) 16-50 (76) pm, most cells less than 30 pm long (25) 35-120(150) pm, most cells more than 40 pm long Length of mid-leaf cells 9-30 pm, most cells less than 20 pm 20-60 pm, most cells more than 30 p m Length of cells in the leaf tip (where the lamina is 4-6 cells wide; ignore marginal cells) (8) 9-30 (35) pm, always many oblate, i.e. shorter than broad (11) 12-40(50) pm, very rarely oblate Both species differ from other species of the genus Dicranum (incl. Orthodicranum) by their fragile leaf tips, which can easily be observed in the field by slightly rubbing a moistened finger across the tuft. The leaf tips will stick to the finger. In dry state the leaves of D. tauricum are stiff and more or less straight, whereas those of D. viride appear somewhat curled. This difference, however, is sometimes not very pronounced.