NEW CHROMOSOME-NUMBERS IN TARAXACUM WITH REFERENCE TO SAT-CHROMOSOMES

Chromosome numbers of eight agamospermous Taraxacum microspecies are r eported for the first time: T. hypanicum TZVEL. [sect. Dioszegia (HEUF F.) HEUFF.], T. neosivaschicum TZVEL. [sect. Palustria (LINDB. fil.) D AHLST.], T. pseudohoppeanum KIRSHNER et STEPANEK (sect. Erythrocarpa D AHLST.), T. schroeterianum H.-M. (sect. Rhodocarpa VAN SOEST), T. marm ottae C.E. SONCK, T. lambinonii VAN SOEST [sect. Erythrosperma (LINDB. fil.) DAHLST.], T. zermattense DAHLST. and T. magnoobliquum VAN SOEST (taxa of uncertain classification). All these polyploid microspecies have satellite chromosomes in their karyotypes. Advanced karyological characters were found in sect. Dioszegia, hitherto regarded as a primi tive section of Taraxacum: triploidy in agamospermous T. hypanicum TZV EL. and satellite chromosomes as in this taxon, as in two diploid sexu als T. serotinum (W. et K.) POIRET and T. haussknechtii UECHTR. The re sults presented are compared to the literature data.