Volume 93, Issue 5
October 1984, pages 503-580
pp 503-552 October 1984
An strated account of six species and ten varieties of the genusLepocinclis Perty and thirty-nine species and ten varieties of the genusPhacus Duj from inland waters of northeast, central and south India collected during 1937–76 together with their distribution in the Indian region is given.
Of these, three varieties ofLepocinclis (L. lefevrei varcuttackensis, L. elongata varminor andL. playfairiana varminor) and one species ofPhacus (P. mammillatus) and four varieties (P. balatonicus varmajor, P. acuminatus varbarrackporensis, P. caudatus varmajor andP. ranula varbrevicaudatus) are considered new. Two species and two varieties ofLepocinclis (L. spirogyra Korsh,L. steinii Lemm,L. steinii varsuecica Lemm. andL. ovum varverrucosum Prowse) and twelve species ofPhacus (P. lefevrei Bourr,P. nannos Pochm,P. wettsteinii Drez,P. textus Pochm,P. carinatus Pochm,P. formosus Pochm,P. obolus Pochm,P. ranula Pochm,P. sesquitortus Pochm,P. atrakoides Pochm,P. glaber (Defl) Pochm. andP. hispidula (Eichw) Lemm. and one variety (P. ranula varafricana Bourr) appear to be new records for the Indian region.
Although 13 taxa ofLepocinclis (5 species and 8 varieties) and 79 taxa ofPhacus (61 species and 18 varieties) have been reported previously from the region there are only a few reports which give full details. Some of the records also appear to be doubtful.
Keys to the taxa of the two genera described and lists of other taxa of the genera reported from the region are also given.
Latin diagnosis ofEuglena tuba Carternon Johnson emend. Philipose 1982 is given to validate the species. Three additional species,viz E. orientalis Walton,E. elastica Prescott andE. clara Skuja are also described, the last being a new record for India.
pp 553-560 October 1984
Autotetraploid ofS. americanum (D1-col) was compared with the diploid progenitor,S. americanum Mill (=S. nigrum 2x) (D1) and the natural tetraploid,S. villosum Mill (=S. nigrum 4x) (T1). The study based on morphological comparison,t-test of interpopulation differences in mean values, discriminant analysis,D2 analysis, amino acid-, flavonoid-and sugar-analyses clearly pointed out that autotetraploid has more affinity with the natural tetraploid than with its diploid progenitor leading to the conclusion that autopolyploidy might be significant in the evolution of tetraploid forms within theS. nigrum complex.
pp 561-565 October 1984
Various species of desmids (Cylindrocystis brebisonii, Closterium acerosum, closterium littorale, Cosmarium bioculatum, Cosmarium botrytis, Cosmarium contractum andCosmarium subtumidum) were studied for their surface ornamentation. After trying various methods for removal of the mucilage, it was found that pretreatment with the glusulase preparation was usually effective in cleaning the cells and enhancing their appearance under theSem.
pp 567-570 October 1984
The anther wall ofC. koenigii showed the epidermis, endothecium, middle layer and tapetum. Cytokinesis in the pollen mother cells was successive and isobilateral type of tetrads were formed. The mature pollen grains were three-celled. The development of the embryo sac conformed to the Polygonum type. The antipodal cells increased in number and persisted in the young fruit. Twin embryo sacs occurred in about 30% of the ovules. Endosperm development was nuclear.
pp 571-580 October 1984
Seed germination and early growth of the seedling inSantalum album, a semi-root parasite, is independent of the host but seedling establishment seems to be dependent on the establishment of host contact. About half of the seedlings, raised in aseptic cultures, showed drying of the shoot tip upon transfer to fresh medium and subsequent development of a large number of adventitious shoot buds on the hypocotyl. Attempts to induce rooting in these shoot buds were unsuccessful. Gum tragacanth, which induces haustoria in two Scrophulariaceous root parasites, and xenognosin, the active fraction from gum tragacanth, were effective in inducing haustoria inS. album in the absence of the host.