FIG. 17. Typical forms of asci. i, ascus containing eight 

 spores in uniseriate order, and accompanied by two para- 

 physes, of Peziza cerea ; 2, Sphaerosoma Leveillei ; 3, Geo- 

 glossum Peckianum, eight long multiseptate spores arranged 

 in a fascicle : the paraphyses are curved at the tip ; 4, Ryparo- 

 bius sexdecemsporus, ascus containing sixteen spores ; 5, Tuber 

 excavatum, ascus containing one large spore : some asci con- 

 tain two somewhat smaller spores ; 6, Zignoella corticola, 

 containing eight triseptate spores, irregularly biseriate in 

 arrangement. 



