Volume 74, Issue 5
November 1971, pages 217-268
pp 217-226 November 1971
InC. halicacabum the main bud meristem which develops into an inflorescence is axillary and distinct at the second node below the shoot apex. In its further development two opposite bract primordia develop at its first node and they bear two axillary tendril primordia. The inflorescence axis at its terminal region develops into three floral branches with three subtending bracts. Two or three accessory buds are associated with the inflorescence at the axil.
The trace procambium of the inflorescence axis develops acropetally. Frequent periclinal divisions at tendril apex followed by rapid elongation of the cells and the general intercalary growth considerably increase the length of the tendril primordium. There is a single bract trace and the nature of the vascular supply to the peduncle is similar to that of the tendril. Ontogenetically the tendril is a lateral floral branch.
pp 227-240 November 1971
A survey of the air-spora at Mysore was carried out from November 6, 1965 to November 5, 1966, using vertical cylinders as spore trapping devices. Basing on the visual features counts were taken for sixty-one types of which 47 belonged to Fungi, 5 to Algae, 4 to Vascular plants, 4 to Animal parts and one to Lichens. Fungi contributed to 88% of the total air-spora,Cladosporium alone accounting to half the numbers. Vascular plant parts made up 10·6% of the air-spora and the contributions of Animal parts, Algae and Lichens were 1·076, 0·169 and 0·036% respectively. Relatively high incidence of smut spores andEpicoccum conidia is a notable feature of the air-spora of Mysore. There is no spore-free season at Mysore. The highest incidence of air-spora is noticed during the monsoon seasons and the lowest during the hot and dry season. Data on the seasonal periodicities of many spore types were presented for the first time. Data on clumping in the air-borne dispersion units ofCladosporium, Aspergilli, smut spores,Rhizopus, Hyphal fragments, andAlternaria is reported.Cladosporium made up 87·5% of the total fungal colonies on 21 exposures made during May to September 1966.Aspergillus spp. are more common at Mysore thanPenicillium spp. Bacterial colonies were estimated to be 14·4% of the total colonies. The usefulness of cylinder traps for aerobiological studies ofAlternaria, Cercospora, Helminthosporium, Uredospores, Pollen, etc., is indicated.
pp 241-254 November 1971
Two phases of the life cycle ofStemonitis herbatica, namely, spore germination and fructification, were studied with reference to the factors affecting these processes. Of the four factors studied for their influence on spore germination, age of spores has a marked effect on the rate and percentage of germination, both declining rapidly with age. Light and spore concentration have little effect. Temperatures of 25–30° C are best suited for germination.
Fruiting seems to depend on a nutritional factor, which is present in oats and many other cereals, but not in certain pulses and other natural substrates studied. The induction of fruiting is independent of light, but further development and completion of the process requires light, followed by a period of darkness.
pp 255-264 November 1971
pp 265-268 November 1971
X-ray study of the graphitic clay schist from Hunkund (Ganacharpur) has shown that graphite is crystalline and not amorphous as inferred by earlier workers. The geochemical study indicates that the graphitic clay schist has resulted from the metamorphism of carbonaceous clays.