CLASS ASCOMYCETEAE 





B 



Fig. 102. Erysiphales. (A, B) Family Meliolaceae. (A) Meliola corallina Mont. 

 Perithecium. (B) Irene echinata (Gaill.) Th. & Syd. Hypha with hyphopodia. (C) 

 Family Englerulaceae. Englerula effusa (Cke. & Mass.) Theiss. Perithecium with 

 wall dissolved into individual cells and a mass of shme. (D) Family Capnodiaceae. 

 Scorias spongiosa Schw. Perithecia and pycnidia. (A-B, after Engler and Prantl: Die 

 Natiirlichen Pfianzenfamilien, Leipzig, W. Engelmann. C, after Theissen and Sydow: 

 Ann. Mycolog., 15(6):389-491. D, after Ellis and Everhart: The North American 

 Pyrenomycetes. 



The process of sexual reproduction has been worked out carefully in 

 Meliola circinans Earle by Graff (1932). Close to one another on nearby 

 hyphae there arise an ovoid uninucleate oogone with short stalk cell and 

 a slender somewhat spirally wound uninucleate antherid, also with a 

 short stalk. The two become appressed near their tips and an opening is 

 produced. The antherid nucleus disappears and what appears to be a 

 fusion nucleus is visible in the oogone, although the passage of the male 

 nucleus into the oogone and its fusion with the female nucleus was not 

 observed. Over the united antherid and oogone the surrounding vegeta- 



