Chromosome numbers of several hepatic species collected in Poland are publi
shed. Polymorphism in chromosome numbers was discovered in Jungermannia lei
antha Grolle: most Polish populations showed n = 9 and only two n = 18; chr
omosome number n = 9 in Jungermannia subulata was confirmed. For Lophozia h
yperborea Schust. & Dams. (n = 9) and for Lophozia kunzeana (Hub.) Evans (n
= 18) the chromosome numbers are published for the first time. (C) 2001 Ad
ac/ Editions scientifiques et medicales Elsevier SAS.