Summary
Arenaria musciformis.—A lenticular generative cell is organised in the 2-nucleate pollen grain. The ripe pollen grain in the anther is either 2-nucleate or 3-nucleate and the two male nuclei are spherical in form but unequal in size. A fully-formed embryo-sac is, as usual, 8-nucleate and of the normal organisation.
Thylacospermum rupifragum.—A definite generative cell is formed in the 2-nucleate pollen grain. The ripe pollen grain in the anther is invariably found to be only 2-nucleate. A fully formed embryo-sac differs from the normal one ofArenaria mainly in the structure of its egg-apparatus— the synergids possess lateral hooks and exceed the egg in the size of the cell. In the seed, the embryo, lying curved on one side of the perisperm, is embedded in a complete sheath of endosperm, two to four cells thick.
A marked feature of the life-histories ofArenaria andThylacospermum is the large amount of degeneration in both the pollen grains and the embryo-sacs.
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Communicated by Dr. H. Chaudhuri.
The writer is highly indebted to Dr. S. L,. Ghose for his keen interest and encouragement during the course of the investigation. Sincere thanks are due to Mr. A. C. Joshi of the Benares Hindu University for several valuable suggestions and criticisms.
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Joshi, P.C. Some phases of the life-history of two Tibetan caryophyllaceÆ—Arenaria musciformis Wall. andThylacospermum rupifragum Schrenk. Proc. Indian Acad. Sci. 4, 471–482 (1936). https://doi.org/10.1007/BF03051420
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DOI: https://doi.org/10.1007/BF03051420