Volume 61, Issue 5
May 1965, pages 237-289
pp 237-241 May 1965
pp 242-252 May 1965
This paper describes the ontogeny and structure of leaf in some species ofLycopodium. The leaf originates from a group of a few superficial cells which later on become associated with some cells of the inner tissue of the stem which is just beneath the outer layer of the stem apex. To begin with every cell of this primordium is meristematic. Later on, sign of maturation of cells becomes evident in the apical-most cells and the basal cells of the leaf and the further growth thus becomes intercalary. Lastly, a considerable increase in the leaf tissue is due to elongation of individual cells. The anatomy of leaf is simple. It is traversed by a single mesarch vascular bundle. The arrangement of leaf is, however, quite variable in different species ofLycopodium as well as in the same species and even in the same plant at different regions. The stomata is of the haplocheilic type.
pp 253-261 May 1965
In this work 23 species belonging to 12 genera distributed within Cruciferae, Caryophyllaceae and Compositae (tribe Gnaphalieae) have been studied. Each species has been studied from a large number of collections often coming from diverse sources.
Ten species have been worked out for the first time. Intraspecific chromosomal races have been reported in two species. In one (Stellaria media) the races have an aneuploid relationship, while in the other (Anaphalis adnata) they are at the polyploid level. All these results have been briefly discussed and, wherever possible, pertinent points have been brought out.
pp 262-266 May 1965
1. The present studies in the vegetative growth in Kaghzi lime were carried out at the Horticultural Research Institute, Saharanpur (U.P.), during the year 1961.
2. Five distinct vegetative flushes were recorded in Kaghzi lime trees of which the spring flush produced the maximum growth.
3. The highest percentage of vigorous shoots appeared in the 3rd flush (appearing on 272-5-1961); normal shoots in 1st flush (appearing on 31-1-1961) and non-vigorous shoots in 5th flush (appearing on 3-10-1961).
pp 267-276 May 1965
The root apical organisation of nine species of dicotyledons belonging to some primitive and some advanced families has been investigated.
The structural configurations of these species fall under three types: (i) with four superimposed tiers, a common tier for the dermatogen and the peripheral region of the root-cap—the dermocalyptrogen—hypodermis, periblem and plerome, (ii) with three tiers of initials, the dermocalyptrogen, periblem and plerome, and (iii) with a common group of initials for all.
InGrevillea roots, as they grow older, the cortical initials are found to divide obliquely and transversely towards the distal end at their junction with the columella, form secondary columella files which exhibit knees and thus contribute to the cap region. This shows that ontogenetic studies are required to understand fully the apical organization.
The presence of a common group of initials in the third type and its positionvis-a-vis the central cell and initial group concepts has been discussed.
The presence of two distinct sets of initials in the cap, one for the formation of the peripheral portion and the other for the columella, is discussed in relation to literature.
The formation of parabolas at the root apices leading to a distinct pattern formation is exhibited particularly by aquatic plants and the probable relation of the habitat to such is pointed out.
The different modes of origin of the epidermis and the origin of the endodermis are brought out.
pp 277-289 May 1965
Eleven new species of spiders are described in this paper. Most of the species were collected from Poona District, Maharashtra, and one species collected from Mussoorie, U.P., India. The new species belong to seven genera distributed in the family Thomisidae.