6o 



PHARMACEUTICAL BOTANY 



hj^hae which suggests a close relation with the Siphonales group of 

 green algae. Their sexual organs are likewise similar in structure. 



CP o 



Fig. 32. — Clasiceps purpurea. A. Young 

 sclerotium, s, with old sphacelia, s.p. The 

 apex of the dead ovary of rye. B. Upper 

 part of ^ , in longitudinal section, showing 

 sphacelia, j . C. Transverse section through 

 the sphacelia, more highly magnified, m. The 

 mycelium, surrounded with the hyphae; b, 

 bearing conidia; p. conidia fallen off; w, the 

 wall of the ovary. D. Germinating conidia, 

 forming sporidia, j-. {From Sayre after Backs.) 



Fig. 33- — Portion of 

 Horn-shaped sclerotium 

 of Clasiceps purpurea, 

 bearing four stalked re- 

 ceptacles. {From Sayre.) 



Fig. 34. — Longitudi- 

 nal section of a receptacle, 

 magnified, showing the 

 perithecia. {From Sayre.) 



SdB-CL ASS \.— OoMYCETES 



(Sexual apparatus hetetogamous) 



Order i. Chytridiales. — E.x. : Synchytrium, a form parasitic on 

 seed plants and forming blister-like swellings. 



Order 2. Saprolegniales. — Water molds which attack fishes, frogs, 

 water insects, and decaying plants and animals. Ex. : Saprolegnia. 



