Volume 6, Issue 4
October 1937, pages 203-261
pp 203-212 October 1937
pp 213-219 October 1937
pp 220-223 October 1937
pp 224-229 October 1937
Septal nectaries and hydathodes are for the first time reported in the coconut.
Nectar is secreted by the stigmatic surface and by three septal nectaries which are provided with outlets below the stigma. There are no secreting glands at the base of the ovary.
The epidermal hydathodes exude a liquid in the region below the stigma. Under South Indian conditions, in the tall type of palms, this exudation occurs before stigmatic receptivity, and does not exclude ants from reaching the stigma.
In the male flowers also the secretion of nectar is effected by septal nectaries situated in the pistillode.
pp 230-231 October 1937
pp 232-250 October 1937
pp 251-261 October 1937
There are three pairs of cement glands inEtroplus maculatus situated on the dorsal side of the head, the anterior-most pair being smaller than the posterior two pairs.
They produce mucus which help to attach the larva to the bottom till it is capable of independent swimming movement.
The gland rudiments first appear when the embryo is thirty-eight hours old as thickenings of the inner layer of the ectoderm.
The gland cells soon enclose a cavity into which the secretion is poured and by the time of hatching the outer layer of ectoderm over the cavity is lost.
The glands grow in size and remain active till the fourth day after which they begin to degenerate. They shrink in size, get flattened out and the superficial layer of ectoderm grows over them. They disappear by the seventh day.