Chromosome numbers and reproductive systems in selected representatives of Hieracium subgen. Pilosella in the Krkonoše Mts (the Sudeten Mts) - 2.

Chromosome numbers and reproductive systems of the following species are reported from the Krkonoše Mts (the Sudeten Mts): a) species not previously studied within this area: H. fuscoatrum Nägeli et Peter (2n = 36, apomictic), H. blyttianum Fr. (2n = 36, apomictic), H. tubulascens Norrl. (2n = 36, apomictic), H. bauhini Besser (2n = 45, apomictic), H. onegense (Norrl.) Norrl. (2n = 18, sexual); b) new cytotypes recorded: H. floribundum Wimm. et Grab. (2n = 18, sexual), H. apatelium Nägeli et Peter (2n = 45, apomictic), H. iseranum Uechtr. (2n = 45, apomictic), H. aurantiacum L. (2n = 45, apomictic), H. stoloniflorum Waldst. et Kit. (2n = 45); c) additional data on distribution and reproduction mode of species previously studied: H. pilosella L. (2n = 36, sexual), H. lactucella Wallr. (2n = 18), H. caespitosum Dumort. (2n = 36, apomictic), H. aurantiacum L. (2n = 36, apomictic), H. schultesii F. W. Schultz (2n = 36, apomictic), H. glomeratum Froel. (2n = 45, apomictic), H. floribundum Wimm. et Grab. (2n = 36, apomictic), H. piloselliflorum Nägeli et Peter (2n = 36, both sexual and apomictic; 2n = 45, apomictic; 2n = 54, apomictic). Chromosome numbers are given for the first time for H. fuscoatrum and H. tubulascens, the record of diploid sexual plants is a novelty for H. floribundum. New ploidy levels are also reported for H. apatelium and H. iseranum. The richness of the Krkonoše Mts in Hieracium subgen. Pilosella is discussed with respect to number of basic (4) and sexual (7) species. In the Czech Republic as well as in the Sudeten Mts, two species of this subgenus (H. fuscoatrum and H. tubulascens) were recorded for the first time.