Volume 68, Issue 1
July 1968, pages 1-58
pp 1-8 July 1968
The paper gives an account of the embryology of an endemic species ofPhoenix occurring in a corner of Deccan Trap area in the Western Ghats at Mulsi, a taluka in Poona District. It deals with the morphology of male and female flowers, pollen grains, ovule, development of male and female gametophytes, endosperm and embryo in that species.
The tree trunk is 5–7 m high, tessellated as inCycas due to comparatively small size of the old leaf-sheath scars. The plants are dioecious. The pollen grains are round, monocolpate, smooth and thick-walled. They are shed at 2-celled stage. The ovules are bitegmic, crassinucellate and anatropous. Fertilization is porogamous. Endosperm is free-nuclear to begin with but becomes cellular later.
The embryo develops in two ways; according to (1)Geum variation and (2)Polygonum variation of the Asterad type. Micropyle is terminal in early stages, but shifts to the side of the seed wall later. Previous literature, etc., on the genus has been cited in the previous paper by Mahabale and Biradar (1968) and, therefore, is not given here.
pp 9-10 July 1968
pp 11-24 July 1968
The morphology and anatomy of the inflorescence and flower, the development and structure of the anther and pollen, ovule and embryosac, endosperm and embryo and structure of the seed and fruit wall are described in some species ofLambertia. The differences betweenLambertia and 9 other genera along with which it is placed in the tribe Macadamieae are pointed out and the characters on the basis of whichLambertia is now raised to the status of a separate tribe, the Lambertieae are discussed. The name Macadamieae is retained for the other 9 genera of the erstwhile Macadamieae.
pp 25-36 July 1968
Morphology of the sporophyte and gametophyte ofAmpelopteris prolifera is described. The rhizome is dichotomously branched, short creeping and nearly naked except at the apex where it bears small basally attached, gland-tipped paleae bearing deciduous acicular as well as glandular marginal hairs. The parenchymatous ground tissue includes a few scattered partially thick-walled cells. The vascular cylinder is a radio-symmetric dictyostele dissected into narrow meristeles by spirally disposed leaf gaps, each associated with a pair of ribbon-like leaf trace bundles. Leaves are pinnate; most vegetative leaves on adult plants grow indefinitely and proliferate profusely by means of vegetative buds borne in the axils of some of the pinnae. The vascular connection to the bud is fused with that of the associated pinna and originates as a hollow cylindrical extramarginal strand from the rachis bundle. The stipes (when young) and rachis bear characteristic, branched, unicellular, club-shaped hairs; elongated acicular hairs are found on the veins and on young lamina. Venation is goniopteroid. Sori are exindusiate, elongated and borne on the secondary veins. The sporangium is leptosporangiate and commonly bears 1 or 2 large glandular hairs on the stalk. The spores are bilateral, with smooth exine and granulose perine. On spore germination a uniseriate germ filament is produced, which develops into a cordate prothallus by forming a wedge-shaped meristematic cell in its terminal cell. The mature prothallus is cordate, with a thin midrib and broad wings. Young prothalli are naked. Aspidiaceous hairs are produced on the surfaces and margin towards maturity; sparse unicellular acicular hairs are often found on the margin of the mature prothallus. Sex-organs are of the common leptosporangiate type. It is concluded thatAmpelopteris is closely related toCyclosorus and that its separation as a genus fromGoniopteris does not seem to be justified.
pp 37-51 July 1968
Trace element studies were carried out on five pathogenic fungi—Cercospora hibiscina Ellis and Everh.,C. withaniae H. and P. Syd.,C. crotalariae Sacc.,Monochaetia sp., andPestalotia theae Sawada. The trace element contaminants from glassware, basal medium, water, glucose and inoculum were removed by various usual means. In addition, EDTA was used for the removal of trace elements from glassware and water. Out of the 15 trace elements tested, Fe, Zn, Cu and Mn were found to be essential for the growth of these five fungi while Mo was found essential only for the growth ofC. crotalariae andMonochaetia sp. No other trace element was found to be essential for any of these fungi. Optimum concentrations in ppm of essential trace elements for these fungi were found to be as follows:C. hibiscina: Fe 0·2, Zn 0·01–0·1, Cu 0·01 and Mn 1·0;C. withaniae: Fe 1·0, Zn 1·0, Cu 0·1 and Mn 10·0;C. crotalariae: Fe 0·01, Zn 10·0, Cu 0·001, Mn 0·1, and Mo 0·001;Monochaetia sp.: Fe 1·0, Zn 0·1, Cu 0·1, Mn 0·1 and Mo 0·01; andPestalotia theae: Fe 10·0, Zn 0·1, Cu 0·01 and Mn 0·01. Concentrations higher than the optimum were inhibitory to the respective fungi.
pp 52-58 July 1968
The generaParyphostomum Dietz, 1909,Artyfechinostomum Lane, 1915,Pseudoartyfechinostomum Bhardwaj, 1963 andNeoartyfechinostomum Agarwal, 1963, have been compared in the light of the variations observed from the study of the materials collected from different hosts and these genera have been found synonym toEchinostoma Rudolphi, 1809. On study it is also found thatArtyfechinostomum sufrartyfex Lane, 1915 and various other closely related species reported by subsequent authors are synonym toEchinostoma malayanum Leiper, 1911.