• T V Desikachary

      Articles written in Proceedings – Section B

    • Mastigocladopsis jogensis gen. et sp. nov., A new member of the stigonemataceæ

      M O P Iyengar T V Desikachary

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      An alga which shows the characteristics of the two families, the Nostochopsidaceæ and the Mastigocladaceæ,viz., both lateral and terminal heterocysts as in the former family and reverse ‘V’-shaped and simple branching as in the latter family is described in detail. Owing to the combination of the characteristics of two distinct families, the alga is referred to a new genus by nameMastigocladopsis and placed in a new family the Mastigocladopsidaceæ.

    • OnCamptylonema indicum Schmidle andCamptylonemopsis gen. nov.

      T V Desikachary

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      The genusCamptylonema was established by Schmidle on the type-species,Camptylonema indicum, which had been collected from Bombay The genus was placed by him under the Stigonemaceæ, since both true and false-branches were found by him in the alga. Forti, Ghose and Geitler, doubting the occurrence of true branching in the alga, transferred the genus to the Scytonemaceæ. The type-species,C. indicum, which was not recorded again since Schmidle described it, was recently recorded by the writer from Cochin in South India. Undoubted cases of true branching are found in this alga in addition to false-branches. Since true branches are found in the alga, the genus is now retransferred to the Stigonemataceæ.

      A new genus,Camptylonemopsis, is created to include species likeCamptylonema lahorense Ghose andCamptylonema Danilovii Hollerbach, which possess crescent-shaped filaments, but do not show true branching. The new genus,Camptylonemopsis, is placed under the Michrochætaceæ.

      Three new species ofCamptylonemopsis from South India,viz.,C. pulneyensis sp. nov.,C. minor sp. nov. andC. Iyengarii sp. nov., are described in the paper.

    • Electron microscopy and algology

      T V Desikachary

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      Since 1936, when the first alga was investigated with the help of the Electron Microscope more and more algæ have been studied. These studies have greatly contributed to our knowledge of the submicroscopic morphology of algæ. A review of the most important aspects of these investigations is given in this paper.

      The utilization of the results of these Electron Microscopic investigations in taxonomy is discussed.

    • Tænioma J. Ag. from India

      T V Desikachary M S Balakrishnan

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      Both the known species ofTœnioma, T. perpusillum J. Ag. andT. nanum (Kuetz.) Papenfuss, are here reported for the first time from India. General features of thallus organisation in both species are described in detail. The development of tetrasporangia in T.Perpusillum is described. In general, the writers’ observations are in agreement with those of Papenfuss. The taxonomy of the genus is discussed and the authors agree with Papenfuss in keeping the two species distinct.

    • Structure and reproduction ofPsuedogloiophlœa fascicularis (Boergs.) comb. nov.

      T V Desikachary A D Singh

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      The structure of the thallus, formation of the spermatangia and the carpogonial branches together with post-fertilisation stages inPseudogloiophlœa fascicularis (Boergs.) comb. nov., are described in detail.

      In the general features of reproduction the alga agrees withPseudogloiophlœa capensis (Setch.) Lev. described by Svedelius. The post-fertilisation stages ofPseudogloiophlœa fascicularis (Boergs.) comb. nov. appear to be similar to those ofScinaia furcellata as described by Svedelius.

    • The chemical composition of the diatom frustule

      T V Desikachary N E Dweltz

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      This paper describes the X-ray diffraction studies carried out on a large number of present-day, as well as fossil diatom frustules. From the diffraction patterns given by the various specimens, it has been concluded that the silica present in diatom frustules is not in an amorphous or sub-colloidal state as was spposed by previous workers but that it is crystalline α-quartz. Although crystalline α-quartz is present in present-day diatoms, the degree of crystallisation is much less than in the fossilized specimens. In addition to the crystalline quartz content, there is present in all diatoms an organic component which might possibly be a protein. In the present-day diatoms this organic component occurs in considerable proportion so that its X-ray diffraction pattern tends to mask the pattern due to crystalline α-quartz. On fossilization, however, a considerable amount of the protein content is lost, while the silica content becomes more predominant, and more and more crystalline with time. Evidence for the occurrence of pectin in diatoms is also presented.

    • Studies onCyclotella meneghiniana Kütz - III. The frustule

      T V Desikachary V N R Rao

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    • Contributions to our knowledge of South Indian Algae—IX

      M O P Iyengar T V Desikachary

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