. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . 398 (Edogoniales precisely similar morphological characters. How have the androzoogonidia of thenannandrous species arisen 1 It is not at all probable that they have arisen from theantherozoids of the monoecious species by an increase in size of the antherozoid mother-cells, because two antherozoids almost invariably arise in each cell of the antheridium bythe division of the protoplast, whereas the entire protoplast of the androzoogonidangiu
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . 398 (Edogoniales precisely similar morphological characters. How have the androzoogonidia of thenannandrous species arisen 1 It is not at all probable that they have arisen from theantherozoids of the monoecious species by an increase in size of the antherozoid mother-cells, because two antherozoids almost invariably arise in each cell of the antheridium bythe division of the protoplast, whereas the entire protoplast of the androzoogonidangiumforms a single androzoogonidium. Seeing that this is also the case in the formation ofboth the androzoogonidia and gynozoogonidia of the macrandrous species, and in thegynozoogonidia of the nannandrous species, it is reasonable to suppose that the smallandrozoogonidium of the latter has arisen merely by a reduction in size, which has goneon hand in hand with a greater sexual differentiation. The specialization has become suchthat the audrozoogouidia are attracted to the vicinity of the oogonia and only germinate
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