LABOULBENIALES 



373 



connections, as in the Pezizales, etc., (Meyer, 1902, among others) 

 and in Polysiphonia in the higher Floridaes (with the exception of the septa 

 of the original perithecial cells, of the trichogyne and the appendages) 

 septa between cells of the same origin show perforations in the middle 

 lamella penetrated by protoplasmic threads. 



In the course of this whole development, which takes about three 

 weeks, the perithecium has developed to a large cell body which, as is 

 shown in Fig. 249, 2, in Stigmatomyces Sarcophagae, projects far beyond 

 the sympoclial antheridium and has pushed it to one side. By the 

 pressure of the developing asci, the superior supporting cell ot, the second- 



Fig. 250. — 1. Dichomyces biformis. Mature individual with six, horned perithecia. 

 2. Rhizomyces crispatus. Mature individual. The ends of the appendages are more 

 curved in nature. 3. Laboulbenia elongata. Abnormal individual; the perithecium 

 aborted, antheridial appendages borne on the blackened bases where perithecial normally 

 develop. (1 X 400; 2 X 195; 3 X 145; after Thaxter, 1896 and 1908.) 



ary supporting cell sut and the parietal cells pc are gradually destroyed; 

 and often even the inferior supporting cell ut. The ascus walls dis- 

 integrate so that the ascospores asc lie free in the perithecial cavity. 

 They are pressed out between the thickened lower canal cells nc' , destroy 

 the upper canal cells c and tc, and are thus liberated between the lip cells 

 wz. Individuals which mature in the fall may discharge ascospores 

 through the whole winter into spring. 



In other Laboulbeniaceae, numerous variations from this scheme 

 are known. As already mentioned in the introduction, certain forms 

 possess not a foot but a well-developed haustorium. There is also a 



