CLASTEROSPORIUM. 401 



branched, septate, brown ; conidia erect, often fasciculate, 

 cylindric-fusoid, blackish-brown, multi-septate, straight,, 

 curved, or geniculate, obtuse and paler at both ends, 150- 

 200 //, long. 



Clasterosporium vermiculatum, Cke., Black Moulds, t. 11, 

 f. 10; Sacc., Syll., iv. n. 1817. 



On oak wood. 



Clasterosporium fasciculare. Sacc. 



Tufts effused, black, opaque; conidia crowded, erect, 

 obovate, very shortly pedicellate, usually 3-septate, scarcely 

 or not at all constricted at the septa, blackish-brown, almost 

 opaque, 30-40 x 20-25 /*. 



Clasterosporium fasciculare, Sacc., Syll., iv. n. 1834. 



On wood, especially birch. 



Clasterosporium opacum. Sacc. 



Unequally effused, jet black, opaque ; conidia very shortly 

 pedicellate, oblong, elliptical, obovate, or otherwise variable, 

 1 3-septate, more or less constricted at the septa, brown, 

 then almost black and opaque, 25-35 x 13-18 /z. 



Clasterosporium opacum, Sacc., Syll., iv. n. 1836. 



On elm trunks, &c. 



Clasterosporium fungorum. Sacc. 



Tufts effused, plane, jet black, 2-3 mm. across, compact, 

 superficial ; conidia densely fasciculate, fusoid, apex rounded, 

 25-28 X 8 /*, straight or unequal sided, 3-, rarely 4-septate, 

 slightly constricted at the septa, the two intermediate cells 

 smoky and guttulate, attenuated at the base into a short, 

 cylindrical conidiophore. 



Clasterosporium fungorum, Sacc., Miscell. Myc., i. ; Sacc., 

 Syll., iv. n. 1846. 



Sporidesmium atrum, Grev., Cr. Fl., t. 194. 



On various species of Corticium, &c. 



Clasterosporium abruptum. Sacc. 



Forming little, black, pulvinate tufts, and externally 

 resembling a hairy Sphaeria ; conidia oblong or slightly 

 clavate, apex rounded, base attenuated into a very short 

 conidiophore, 3-4-septate, apical and basal joints short ; the 

 second from the top very long, 50-75 X 12-18 p.. 



VOL. III. 2 D 



