Cytological studies on some mosses from the British Isles

Abstract

The results of cytological investigations on 95 populations from 60 species of mosses are given. These results include studies of gametophyte mitoses from 26 of the species concerned. The technique for obtaining gametophyte mitotic preparations is described. Karyotype comparisons are made within the genera Polytrichum and Dicranum and the value of such comparisons is stressed. Where possible gametophytic mitotic observations have been correlated with sporo‐phytic meioses from the same gatherings.

The Moss Flora of King George Island, Antarctica

“…Thus, the chromosome count n = 11 established for that material should refer to P. drummondii. It represents the second chromosome count for the species and confirms the previous one from the British Isles (Ramsay, 1969). Some populations of Pohlia cruda may mimic P. wahlenbergii, particularly in cell laxity (Lightowlers, 1983), but plants of the latter are never glossy and the colour of the leaves varies between green and pink.…”

Australian mosses - new chromosome numbers and a compilation of chromosome data

“…The various cytological studies have shown that in the Australasian region the numbers and morphology of the chromosomes examined are comparable with those obtained in other parts of the world (Ramsay 1969(Ramsay , 1974(Ramsay , 1983bFritsch 1991). Some unique data for Australia and New Zealand include the low chromosome numbers n=4, 5 for Hypnodendraceae (Ramsay 1974(Ramsay , 1987(Ramsay , 1988 while the possible presence of sex chromosomes in Macromitrium, as indicated by dimorphic bivalents, anisospory and dwarfism of males, has been discussed (Ramsay 1966a(Ramsay , 1979(Ramsay , 1983cRamsay & Berrie 1982;Smith & Ramsay 1982;Ramsay & Vitt 1986).…”

Molecular cytogenetic analyses of haploid and allopolyploidPelliaspecies

“…Interest in bryophyte cytogenetics in the twentieth century resulted in the discovery of chromosomes with large block of heterochromatin, sex chromosomes and minichromosomes and descriptions of their behavior in meiosis (Ramsay, 1969;Newton, 1977;Nakayama et al, 2001). Chromosome numbers are now known for y2250 or y15% of all bryophyte species (Fritsch, 1991) but karyotyping of bryophytes lags far behind flowering plants.…”