436 FUNGUS-FLOEA. 



Septosporiwm atrum, Corda, in Sturm's Deutscli. FL, t. 17; 

 Saco., Syll., iv. n. 2600. 



DACTYLOSPOEIUM. Harz. (fig. 23, p. 397.) 



Hyphae erect, simple ; conidia obovate, m.uriformly septate, 

 iDrown, collected into a terminal head. 



Bactylosporium, Harz, Hyph.. p. 44; Sacc, Syll., iv. 

 p. 645. 



Dactylosporium brevipes. Grove, (fig. 23, p. 397.) 



Gregarious, black; hyphae erect, short, flexuous, fuscous, 

 paler upwards, densely septate, subtorulose (cells sub- 

 quadrate), simple or furcate towards the apex, 50-70 X 5 /j., 

 bearing a jet-black head consisting of 5-8 conidia closely 

 compacted ; conidia obovate, deep fuscous, almost opaque, 

 20-22 X 10-13 /i, angularly cellular, one septum longitudinal, 

 the remainder oblique or radiating. 



Dactylosjxn-ium brevipes, Grove, Journ. Bot., 1886, p. 204, 

 tab. 267, f. 7; Sacc, Syll., Suppl. 1-4, n. 3641. 



On wood of sycamore. 



Closely allied to D. macropus, of which it is perhaps a 

 variety. (Grove.) 



ALTEENAEIA. Nees. (fig. 21, p. 397.) 



Hyphae fasciculate, somewhat erect, almost simple, short ; 

 conidia clavately flask-shaped, muriformly septate, catenulate 

 and connected by slender portions, soon separating. 



Alternaria, Nees, Syst. d. Pike, ii. p. 72 ; Sacc, Syll., iv. 

 p. 545. 



Distinguished by the clavate, or flask-shaped muriformly 

 septate olive conidia being united in chains and connected 

 by narrow isthmus-like portions. 



Alternaria brassicae. Sacc. (fig. 21, p. 397.) 

 Hyphae short, continuous, very shortly branched, tips 

 equal, in small tufts; conidia in chains, deciduous, elongated, 



