CONSPECTUS OF OOSPORES. 71 



V. Oospore terete, fusiform or ellipsoidal. Mem- 

 brane thin or thick ; flexible, semi-rigid or rigid ; 

 translucent, semi-opaque or opaque ; granulate . CHARA, 



(1) Membrane translucent 



(i) membrane strongly granulate. 



(a) granular density c. 5 per 10 p C. hispida. 



(b) granular density c. 6 per 10 /z 



C. contraria. 



(c) granular density c. 7 per 10 /u C. vulgaris. 



(d) granular density c. 8 per 10 n 



C. denudata. 

 (ii) membrane very faintly granulate. 



(a) dull brown ... (7. aculeolata. 



(b) chestnut brown C. rudis. 



(c) clear yellow C. tomentosa. 



(d) red-brown . . . C. baltica. 



(2) Membrane semi-opaque or opaque 



(i) membrane thick with many evident lamina. 



(a) granules very obscure. 



(i) dull brown and brittle C. aspera. 



(b) granules less obscure. 



(i) granular density c. 7 per 10 /LI, 

 very dark dull brown 



C. connivens. 

 (ii) granular density c. 9 per 10 JLI } 



dark brown . C. fragifera. 



(iii) granular density c. 5 per 10/., 



very dark to black . C. fragilis. 

 (iv) granular density c. 5 per 10/*, 



very dark to black C. delicatida. 

 (v) granular density c. 7 per 10 fi, 

 bright red-brown 



C. desmacantha. 



(ii) membrane less thick without evident 

 lamina. 



(a) granular density c. 7 per 10 /u, dull 



brown to black . . C. Braunii. 



(b) granular density c. 6 per 10/./, very 



dull brown C. canesccus. 



