Abstract
1. Centrosomes are present in Blasia at all stages of the mitosis which differentiates the androcytes, and in the androcytes they persist and function as the blepharoplasts. 2. In the transformation of the androcyte into the spermatozoid, the blepharoplast fragments repeatedly by simple fission, forming a number of distinct granules which coalesce to form a short lumpy rod. This rod elongates and becomes a more uniform thread bearing two cilia, while the nucleus also elongates in intimate union with it to form the body of the spermatozoid. The present instance is the first in which blepharoplast fragmentation has been reported in a bryophyte. 3. It is possible that the fission of the Blasia blepharoplast, and therefore the more complex fragmentation of the blepharoplasts of Equisetum, Marsilia, and the cycads, may be homologized with the normal division exhibited by ordinary centrosomes.
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