276 



CLASS ASCOMYCETEAE 



Fig 90. Sphaeriales. Various types. (A, B) Family Chaetomiaceae. Chaetomium 

 aterrimum E. & E. (A) Perithecium (showing the straight body hairs, the coiled oral 

 hairs, and the mass of exuded ascospores. (B) Terminal portion of an oral hair. (C, D) 

 Family Melanosporaceae. Melanospora chionea (Fr.) Corda. (C) Several perithecia 

 on decaying leaf. (D) Vertical section through perithecium. (E, F) Family Sphaeri- 

 aceae. Kosellinia aquila (Fr.) de Not. (E) Vertical section through perithecmm and 



(Continued on facing page.) 



