Proceedings of the Ohio State Academy of Science 49 



Coll. Bruce and H. W. Fink, May 10, 1907. Freda M. 

 Bachman, April 23, 1908. 



Genus VII. Arachnopeziza Fuck. Symb. Mycol. 303. 1869. 

 Type species. Tapesia aurelia Pers. 



Mycelium superficial, arachnoid. Apothecia fleshy-waxy, 

 sessile, exterior villous or scaly, interior concave becoming plane ; 

 in groups. Paraphyses filiform. Asci cylindrical or cylindrico- 

 clavate. Spores 8, fusiform, oblong-elliptic, hyaline, simple or 

 1-3 septate. 



Growing on decaying vegetation, most often on wood. 



KEY TO SPECIES. 



a — Apothecia minute, white delicatula 



a — Apothecia larger, yellow aurelia 



Arachnopeziza aurelia (Pers.) Fuck. Symb. Mycol. 303. 1869. 

 Peziza aurelia Pers. Mycol. Eur. 270. 1822. 



Mycelium often abundant, yellowish. Apothecia solitary 

 or in groups, 0.5-1 cm. broad, hemispherical, becoming plane, 

 interior of the cup bright yellow, exterior covered with reddish 

 fasciculate hairs. Flymenium and central part of the cup hya- 

 line, hypothecium somewhat darker. Paraphyses filiform. Asci 

 cylindrico-clavate. Spores 4 celled, hyaline, 15-18 mic. long and 

 4-5 mic. wide, fusiform or oblong often having a short cilium 

 at each end. 



Very little of the mycelium was above the substratum in the 

 material collected in the spring, while that of late fall showed a 

 thick mass of hyphae in which the apothecia were borne. 



Growing on old logs or stumps. 



Coll. Gertrude Lett, Freda Bachman, Nov. 9, 1907. L. O. 

 Overholts, May 2, 1908. 



-\- Arachnopeziza delicatula Fuck. Symb. Mycol. 304. 1869. 



Mycelium delicate and visible only near the apothecia. 

 Apothecia scattered, minute, about 0.5 mm. broad, cup-shaped, 

 becoming nearly plane, white, when old and dry. dingy-yellow. 



