LABOULBENIALES 383 



species, as R. Coelostomalis (Fig. 257, 8 to 11) and R. rostrata (Fig. 257, 

 1), while functional antheridia have not been seen, vestigial structures 

 were observed. 



Perithecial development is similar to that of Stigmatomyces Baeri. 

 The trichogyne is often characteristically branched with slightly swollen 



Fig. 258. — Diaphoromyces marginatus. 1. Young individual showing the relation 

 of the posterior series to the two-celled base of primary appendage (left). 3. Foot of adult 

 showing striations. 4. Termination of young axis showing formation of the basal cells of 

 secondary appendages by nuclei, at different stages. 5 Young individual showing 

 primary appendage p and secondary appendages s. 6. Fully mature individual. Dia- 

 phoromyces Lispini. 2. Form with branched and highly developed appendages, from 

 Trinidad. 7. Smaller simpler type from California. {After Thaxter, 1926.) 



extremities. Its persistent base is usually evident on the anterior margin 

 of the perithecium. 



Diaphoromyces (Fig. 258) has recently been separated from Rickia, 

 on account of the peculiar ontogeny of its secondary appendages, which 

 are successively developed from above downward by the activities of 

 large free nuclei in the cells of the lateral series (Fig. 258, 4). One of its 

 nuclei takes its position against the inner surface of the wall and together 

 with a small portion of protoplasm organizes a small cell, surrounds itself 



