CEKATIUM — ATEACTIUM. 451 



Isaria puherula. Berk., Ann. Nat. Hist., n. 221, t. xii. f. 12 ; 

 Sacc, SylL, iv. n. 2839. 

 On dead Dahlia flowers. 



Excluded species. 

 Isaria microscopica, Grev. = Stilbum iomentosum. 



CEEATIUM. Alb. & Schw. (fig. 23, p. 442.) 



Stroma club-shaped, simple or variously branoted, in- 

 distinctly cellular, externally covered everywhere with, 

 conidia, borne on very short spicules that give to the stroma 

 a velvety appearance, when the conidia have fallen away ; 

 conidia large, continuous, hyaline. 



Geratium, A. & S., Comp. Pung. Lus., p. 358 ; Sacc, Syll., 

 vol. iv. p. 596. 



The present gentis is considered by some authors as 

 belonging to the Myxoga stres, differing from the Hyphomycetes 

 in the absence_of^ true hyphae, and in the conidia giv ing 

 origin to activ e amo e boid bodies on germination. Saccardo 

 considers the genus to be allied to Isaria, but the points of_ 

 agreement appear to be confined to superficial resemblances. 



Geratium hydnoides. A. & S. (fig. 23, p. 442.) 

 Forming minute, or sometimes effused, pure white tufts, 



consisting of numerous erect, simple or slightly branched 



spines that deliquesce and almost disappear when touched ; 



conidia hyaline, smooth, broadly elliptical or globose, 



10-12 X 8 or 10 /A diameter. 



Geratium Jiydnoides, A. & S., Com., p. 358, t. 11, f. 7 ; Sacc.,, 



Syll., iv. n. 2845. 

 Onjvfctenjwood. 



Sect. 2. Phragmosporeae. Sacc. 



ATEACTIUM. Link. (fig. 33, p. 397.) 



Stroma stem-like, terete, composed of a fascicle of more or 

 less parallel hyphae, expanded to form a conidia-bearing 



2 G 2 



