Excerpt from Transactions of the South African Philosophical Society, Vol. 18
The development of the ovule and embryo-sac in plants has been investigated very fully, especially during recent years, and the normal course of events has been thoroughly worked out in several cases. There are, however, in this species of Cassia, certain peculiarities of interest, which are described below. It has been found most conducive to a clear account to give all the stages of development, as far as they have been investigated, normal as well as abnormal.
The species is a South American one, not native in Cape Colony, and the material has been obtained from private gardens in Cape Town.
It is proposed to give a short account of the development from about the archesporial stage to the formation of the definitive nucleus in the eight-celled embryo-sac.
The young ovule at about the archesporial stage is distinctly campylotropous (Fig. I.). No definite archesporial cell or cells are clearly recognisable, but one towards the centre, somewhat larger than the surrounding cells (M.M.C., Fig. I.), is probably the megaspore mother-cell just becoming differentiated.
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