Volume 71, Issue 3
March 1970, pages 79-131
pp 79-85 March 1970
Pteris wallichiana has a short thick ascending rhizome clothed by prominent, spirally arranged, swollen, fleshy, persistent, leaf bases with clusters of roots and paleae between them. A majority of the leaves are reduced, except for their swollen bases which act as storage organs. These are large fleshy ovoid organs, often 3–4×1·5–2·5 cm. in size and composed of thin-walled parenchyma cells with dense deposits of starch. A few vestigial leaves are found on the ventral side of the rhizome. All leaves are associated with an abaxial vegetative bud at its base. The prominent lenticels found on the leaf bases are formed by groups of cells of the inner cortex elongating radially and breaking open the peripheral layer of the outer cortex. The vascular cylinder of the rhizome is a solenostele with a ribbon-like medullary strand acting as a compensatory bundle to close the leaf gaps. The leaf traces areΩ-shaped solitary strands. The ground tissue of the rhizome is parenchymatous, except for a cortical intact sclerenchymatous sheath and a similar but thinner sheath surrounding the vascular cylinder. Starch deposits are absent in the cells, except in the inner cortex. In the stipe the vascular bundle is corrugated due to the protoxylem areas being raised as ridges (over 50 per stipe) and each group is associated with a mucilage-containing strand of cells on its inner surface.P. waltichiana is probably unique among ferns in having bases of reduced leaves acting as storage organs.
pp 86-89 March 1970
ACymbopogon collected from Ramnagar area in Jammu has been described and given the status of a new speciesC. ramnagarensis.
pp 90-93 March 1970
ACymbopogon collected from Haldawani has been described and given the status of new species—C. motia.
pp 94-99 March 1970
Some new varieties have been described under the genusCymbopogon based on morphology and chromosome studies.
pp 100-108 March 1970
The paper deals with the description of five new species of nematodes from vertebrates,viz., Ascaridia andamanensis, A. alata, Ophidascaris piscatori, Porrccaecum pennanti andHerpestostrongylus palustris.
pp 109-117 March 1970
Respiration of treated leaves at different intervals has been investigated along with the control. The results show significantly sharp increase in intramolecular respiration of leaves between 2–4 hours after the application of 50% diesel oil spray which is quite likely the critical time when irreversible changes lead to inevitable death of the parasite. The capacity of the stomata to close is lost soon after the spray.
pp 118-131 March 1970