PLATE CLVIII. 



FIOS. PAGE 



1-3. Cosmocladium constrictum Arch. 1, X 520 ; 2, x 

 1200, showing pores of cell-wall (after Liitke- 

 miiller) ; 3, zygospore, X 600 (after Roy Biss.) 198 

 4-7. C. perissum Roy & Biss. 4, X 600 (after Roy & 

 Biss.) ; 5, X 1200, showing pores (after Liitke- 

 miiller) ; 6, zygospores, X 600 (after Roy & 

 Biss.) ; 7 zygospore, X 475 . . 200 



8-10. C. pusillum Hilse. 8 and 9, X 520 ; 10, X 950 

 (from a drawing by Dr. Liitkemuller from 

 ' Rabenh. Alg. Eur.' no. 1963) . 201 



11-12. C.pukhellum'BiQb. 11, X 275 (after de Brebisson); 



12, X 520 . . . 200 



13-16. C. Saxonicum De Bary. 13 and 14, X 500 ; 15, X 

 520 ; 16, X 1200, showing pores (after Liitke- 

 miiller) . . . 202 



