OEDEMIUM MONOTOSPORA. 377 



phores subglobose, black; conidia minute, subglobose or 

 elliptical, scabrid, hyaline. 



Oedemium atrum, Link, Sp. PI. Fung., i. p. 43 ; Sacc., Syll., 

 iv. n. 1448. 



On branches and bark of lime (Tilia), &c. 



Tribe 7. Monotosporeae. Sacc. 

 MONOTOSPOKA. Corda. (fig. 10. p. 358.) 



Sterile hyphae creeping, scanty; fertile hyphae simple, 

 distinct at the base, somewhat elongated, brown ; conidia 

 apical, solitary, continuous, brown. 



Monotospora, Corda, Icon. Fung., i. p. 11; Sacc., Syll., iv. 

 p. 299. 



Distinguished from Hadrotrichum and Acremoniella in the 

 elongated, distinct, erect fertile hyphae. 



Monotospora sphaerocephala. B. & Br. 



Forming a dense, effused, black layer; fertile hyphae 

 erect, simple, sparingly septate ; conidia globose, smooth, 

 blackish-brown, more or less opaque, 21-26 /x diameter. 



Monotospora sphaerocephala, B. and Br., Ann. Nat. Hist., 

 n. 819, t. ix. f. 5; Sacc., Syll., iv. n. 1459. 



Monotospora repens. Mass. 



Forming small black tufts. Threads short, flexuous, 

 simple or shortly branched, closely septate, especially 

 upwards, where the cells are about equal in length and 

 diameter, pale brownish above but hyaline at the base, 

 8-10 /x diameter; conidia solitary, apical, globose, dark 

 brown, opaque, 20-25 /* diameter. 



Periconia repens, Cke., Grev., vol. xvi. p. 79. 



On herb stems. 



The solitary apical conidium removes the present species 

 from Periconia. 



Monotospora pumila. Mass. (fig. 10, p. 358.) 

 Fasciculate or scattered ; fertile hyphae simple, subulate, 

 erect, septate, blackish-brown and opaque below, apex 

 paler, conidia broadly obovate, opaque, blackish-brown, 

 shining, 23-25 X 15-17 p.. 



