Cytological Studies in the Mosses of Eastern India. III

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Abstract
The chromosome behaviour of 37 populations of mosses belonging to 33 species in 18 genera under 10 families from Eastern India, mostly from the Himalayas, has been studied. These have been listed in Table VI where 21 species not previously worked out cytologically, are marked with an asterisk (*). The table includes the following genera: Garckea, Tayloria, Fleischerobryum and Rhegmatodon reported for the first time. Under each family head, discussing the species including populations under respective genera, previous reports of such genera are integrated where required, which has been followed by a general discussion on the family including its basic number. Chromosome numbers of the worked species fall within the range 6 to 22 as (n). Polyploidy was noted only in 3 species [Pohlia flexuosa (Hook.) Mitt.; Pogonatum neesii (C. Muell.) Mitt. and P. stevensii Ren. et Card.] including one intraspeeific polyploid race P. neesii (n = 7 and 14) out of 33 species described in the work. Intraspecific aneuploid races were found in Brachymenium nepalense Hook. (n = 11 and 11 + m) and Bryum coronatum Schwaegr. (n=10 and 10+m). Minute bivalents were noted in 7 species (Table VI). Heteromorphic bivalents, assumed to be sex chromosomes were definitely established for Fissidens ceylonensis Dz. et Molk. var. jhargrami Gangulee, Dicranella brasiliensis (Duby) Bartr., Bryum argenteum Hedw. and Thuidium glaucinum Mitt. Secondary association was noted in Garckea phascoides (Hook.) C. Muell. and Dicranella brasiliensis (Duby) Bartr. [Syn. Microdus brasiliensis (Duby) Ther.]. Cytomyxis has been demonstrated in Pogonatum neesii (C. Muell.) Mitt, and P. stevensii Ren. et Card. Precocious and lagging disjunction involving one to three bivalents were noted in a number of species.

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