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Between the spores a certain amount of intercellular substance or residual protoplasm is left, in which the refringent granules seem to be embedded.

The endoplasm contains a number of large refringent granules—probably body products.

Its mycelian filaments, if one may so describe them, have been produced scarcely for twenty-four or forty-eight hours when they are seen to transform themselves, those especially which are in free contact with the air, into very refringent corpuscles, capable of gradually isolating themselves into true germs of slight organization.