Summary
Some abnormalities in the female strobilus ofGinkgo biloba are recorded from the only tree growing in the Punjab plain.
2-Ovulate normal strobili are rather rare while 3-ovulate strobili with only the terminal ovule fertile are very common on the tree. Occasionally 4-ovulate and 5-ovulate strobili are met with.
‘Double ovules’ formed by the fusion of the primordia of two ovules during development are met with to the extent of 20 per cent. These are flat, with a median groove. In vertical section they possess two loculi both of which may have fully developed gametophyte or only one of them. In the former case the ovules are symmetrical, in the latter asymmetrical.
Abnormal ovules having the female gametophyte exposed at the apex are frequently met with.
Anatomy of the axis of abnormal strobili has been worked out and differences from that described by previous authors pointed.
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Bibliography
Chamberlain, C. J., “Gymnosperms-Structure and Evolution,” 1934, 205.
Seward, A. C., and Gowan, Miss J., “The maiden-hair tree (Ginkgo biloba L.),Ann. Bot., 1900,14, 109–54.
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Communicated by Dr. H. Chaudhuri,d.sc. (Lond.),ph.d., d.i.c.
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Mehra, P.N. Some abnormalities in the female strobilus ofGinkgo biloba L.. Proc. Indian Acad. Sci. 8, 211–217 (1938). https://doi.org/10.1007/BF03048210
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DOI: https://doi.org/10.1007/BF03048210