• Volume 42, Issue 2

      August 1955,   pages  39-83

    • Studies on the morphology of the axis ofSolanum nigrum (Solanaceae) on the evidence of the internodal and nodal anatomy

      Q A Fattah

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      Nodes and internodes ofSolanum nigrum L. have been studied in serial transverse sections. The vascular cylinder of the internode consists of eleven bundles. The “flower-shoot” develops as an outgrowth of the main axis and three axial bundles form its vascular trace. The original eleven bundles of the internode are restored immediately above the divergence of the flower-shoot (inflorescence).

      The origin and vascular supply of the leaf at the node show that it is alocal appendage like all normal leaves.

      The primary branch is extra-axillary. It originates from the node as a protuberance, being supplied by 2 bundles. The vascular supply to the undeveloped bud is not exactly like that of a normal bud.

      From the nature of the anatomical evidence presented in this paper the axis is monopodial. The inflorescence axis, and the leaf, branch and bud at the node are true appendages of the main axis.

    • Embryological studies inXyris pauciflora willd

      D A Govindappa

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    • Additions to the fungi of Madras—XVIII

      T S Ramakrishnan N V Sundaram

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    • The complete foliage leaf

      Girija Prasanna Majumdar

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    • A tectonic analysis of the quartz reefs in the metamorphites of Tilatanr, Tetulmari (Dhanbad)

      M S Sadashivaiah

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      Numerous quartz-filled faults occur in the metamorphites comprising mica-schists, granulites, injection gneisses, migmatites, amphibolites and hornblende gneisses of Dharwar age in the Tilatanr area. The metamorphites have been folded into a pitching anticline with drag folds on its limbs due to strong folding movements and deformation during Dharwar period. Quartz-filled faults occur not only as individual ones but also as zones. Various structures have been noticed in the quartz of the quartz-filled faults, namely, box-works, honeycomb-texture, platy quartz, shear fractures, tension joints and joint drags. Faults are later than folds and hence they are incongruous with the folds. On tectonic analysis it has been found that there are two types of faults, namely, high angle shear thrusts (reverse faults) and normal faults. Normal faults are later than the shear thrusts and they represent the latest adjustment of rocks to deformation. Shear thrusts are parallel to the strike of the beds and the regional structure and they are reverse faults. Associated with the shear thrusts occur shear fractures, tension joints and joint drags. These minor structures associated with the shear thrusts have been analysed and their relation to the structural axes have been described on the lines of Sander, and others.

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