Studies on the Cytology and Phylogeny of the Pteridophytes

Chromosome Numbers in some Ferns from Kodaikanal, South India

“…NINAN (1956) has also reported the same number for material collected from Ponmudi, South India. Similarly Diplazium esculentum and Asplenium normale have also been worked out earlier from several areas such as Ceylon (MANTON andSLEDGE 1954), Malaya (MANToN 1954) and the Himalayas (Bm 1961b) with the same results as from Kodaikanal.…”

Cytology and Reproduction of Some Indian Species of <i>Isoetes</i>

“…The formation of nuclei and micronuclei is followed by cytokinesis and usually the laying down of a central partition dividing the mother cell into two dyads. Sometimes one or both dyads form a second wall at right angles to the first and this results in the formation of triads and tetrads as described by Ninan (1958) for I. coromandelina.…”

“…However, the only species for which the details of the karyotype are available both at mitosis and meiosis, is I. coromandelina (see Abraham and Ninan 1958;Ninan 1958) and accordingly we thought it useful to study the karyotypes as well as the mode of reproduction by means of spores of two more species , I. panchananii and I. indica, which are available in a nearby locality. In addition , we have also studied the cytological details of plants of I. coromandelina from Varanasi , Lohgarha (Uttar Pradesh) and Konark (Orissa).…”

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“…Abraham and Ninan (42) studied cytology of I. coromandeliana and documented 2n = 22 (Table 1) while cytological and phylogenic studies of family Isoetaceae were carried out by Ninan (43). Verma (44) studied the cytology of I. coromandeliana explored the account of enucleate and nucleate spores.…”