Karyotype analysis in three species of Rhizoclonium Kuetz.

Cytotaxonomical studies in the genus Rhizoclonium Kutz.

“…In rest two taxa, the diameter of metaphase plate has been measured more than 11 times bigger than that of interphase nuclei. This has also been observed in other eight species of this genus (Verma 1969).…”

“…and as such the chromosome number in as many as 16-taxa belonging to this genus have been brought to our knowledge (Geitler 1936, Sinha 1958, Balakrishnan 1961, Patel 1961, Noor 1965, Verma 1969, 1980, Prasad et al 1973. But the num ber of investigated taxa appears too small keeping the size of the genus into con sideration.…”

New counts for Rhizoclonium riparium complex.

“…The annual habit of the order offers varied ecological niches to it for the establishment of new polyploids and accessory means of asexual reproduction alongwith fast vegetative propagation are the remarkable assets to overcome the sexual barrier if any caused by polyploidy. The present counts n=24, 36 and 72 are in multiple of 6 and hence the proposed basic number "6" for the genus (Geitler 1936, Sinha 1958, Balakrishnan 1961, Noor 1965, Verma 1980) is further strengthened with the present findings.…”

Karyomorphological studies on three species of Cladophora kuetz.

“…Coefficient of variation among the chromosomes of a karyotype and total chromatin length was computed as per Verma (1980).…”

“…was initiated as early as 1910 by Nemec and since then a number of contri butions have been made from time to time (cf. Foyn 1930, Higgins 1930, Schussnig 1930, 1938and 1954, Geitler 1936, Sinha 1958, 1963, 1965and 1968, Balakrishnan 1961, Patel 1961, and Verma 1969and 1982. The chromosome numbers in 37 species belonging to this genus are known till to this time.…”