The cytochemistry of the walls of the spermatocytes of Ceratopteris thalictroides.

By means of staining and fluorescence microscopy the walls of the spermatocytes of Ceratpteris thalictroides have been shown to contain callose and lipid. It is suggested that these substances form a barrier to the ingress of metabolites, and are responsible for the failure of differentiating spermatocytes to incorporate C(14)-cysteine.