• Volume 59, Issue 1

      January 1964,   pages  1-52

    • Morphological studies in the Gramineae - V. Vascular anatomy of the spike and spikelets in the Andropogoneae

      Naresh Chandra N P Saxena

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      The present paper deals with the vascular anatomy of the spike and spikelets of twenty species of Andropogoneae. The vascular anatomy of the spikelet indicates that there has been an abbreviation of the axes in the spikelet. In the majority of the Andropogoneae where the lower floret is reduced to its lemma, the bundles, of the second palea arise conjointly with the lateral bundle of the two lemmas and the second empty glume. In those members where the lower floret is also present the bundles of both the paleae, the lateral bundles of the two lemmas and in some cases those of the glumes arise in the form of a single vascular mass on either side.

      Attention has been drawn to the various trends of specialization in the spike and spikelets of this tribe. There is a marked tendency for the imperfection of the pedicelled spikelet which may be variously reduced and in some cases is entirely unrepresented. There is yet another tendency towards the elaboration of the outer empty glumes and the suppression of the lemma I and the palea II which tend to be hyaline and non-vascular and in some cases are completely wanting.

      Occasional increase in the number of lodicules has been recorded forMnesithea laevis andHeteropogon contortus.

    • The production of vitamin B12-like substances by marine micro-organisms - I. General survey

      N M Gandhi Yvonne M Freitas

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      One hundred and thirty-one cultures were isolated from 35 sea-water samples and assayed for vitamin B12-like activity usingLactobacillus leichmannii 313 (7830). The active isolates were identified up to the species wherever possible adopting standard methods.

    • The production of vitamin B12-like substances by marine micro-organisms - II. Studies on nutrition

      N M Gandhi Yvonne M Freitas

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      The effects of different substrates and the presence and absence of various mineral salts were studied with respect to the growth of and the synthesis of vitamin B12-like factors of ten different marine isolates. A detailed study was also made of the effect of various carbon and nitrogen sources on the growth and production of vitamin B12-like factors by one selected isolate.

    • New records of fungi from mysore - III. Two species ofChaetospermum

      T R Nag Raj

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      Chaetospermum chaetosporum andC. elasticae are recorded as new to India. A new variety ofC. elasticae is described. The author is of the opinion thatC. camelliae is identical withC. elasticae. Conidial development inC. elasticae andC. camelliae is described and the two species correspond with each other in this feature as well.

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