Zbigniew Szeląg

Cytogenetic analysis of Hieracium transylvanicum (Asteraceae)

Abstract Hieracium transylvanicum is a relic species which occurs in refugial areas of south-eastern Europe. The structure of its karyotype, including determination of morphometric features of somatic metaphase chromosomes as well as the number and distribution of ribosomal DNA loci, was attempted using both classical chromosome staining and the FISH method with 25S rDNA and 5S rDNA probes. The cytotypes under study were collected from eight sites and did not vary significantly in terms of their karyotype organisation. All 11 specimens had the same chromosome number, 2n=2x=18, and 9 similar chromosomal types, whose total length ranged from 4.62 to 2.64 μm. The karyotype of the species is highly symmetrical. Two chromosomal types, 3 and 6, have a 45S rDNA locus in distal parts of their short arms. In addition, the short arm of type 6 has interstitial 5S rDNA sequences. No intraspecific variation in number and chromosomal distribution of ribosomal DNA loci was observed. The very uniform structure of the karyotype of H. transylvanicum possibly refl ects the old phylogenetic age of this species.

History of Discovery and Typification of Haberlea rhodopensis Friv. (Gesneriaceae)

A lectotype for the name Haberlea rhodopensis Friv. is designated from among specimens stored at the Hungarian Natural History Museum in Budapest (BP). Notes on discovery and etymology of the species are provided.

Hieracia balcanica V. A New Diploid Species in Hieracium sect. Naegeliana (Asteraceae) from Macedonia

Hieracium renatae Szelęg (Asteraceae), distinguished by its glabrous involucral bracts, is described from the alpine belt of the Jakupica Mountains in Macedonia. It is the first known diploid in Hieracium sect. Naegeliana.

Hieracia balcanica VIII. Hieracium nigrescens subsp. brachytrichellum (Asteraceae), a new taxon in the Balkan flora

Hieracium nigrescens subsp. brachytrichellum Zahn, known to date only from the Southern Carpathians, was discovered in the Vranica Mountains in Bosnia. This is the first station of H. nigrescens s.l., an arctic-alpine species of H. sect. Alpina (Griseb.) Gremli, on the Balkan Peninsula. A map of general distribution of H. nigrescens s.l. and illustration of the specimens collected in Bosnia are given. The likely origin of the Balkan population is briefly discussed.