THE FUNGI WHICH CAUSE PLANT DISEASE 657 



Tuberculariaciae-Dematiese-Phragmosporse (p. 639) 



Hyphfe dark; conidia usually colored, 2 to several-septate, ob- 

 long to cylindric. 



Key to Genera of Tuberculariacese-Dematise-Phragmosporse. 



Conidia in chains; sporodochium discoid. 1. Trimmatostroma, p. 657. 

 Conidia not in chains 



Conidia 1-ciliate at each end 2. Ciliofusarium. 



Conidia muticate 



Sporodochium hairy 3. Ezcipulaiia. 



Sporodochium smooth 

 Conidia laterally proliferate and 



joined in bundles 4. Amallospora. 



Conidia not proliferate and 

 united 

 Sporodochia convex-pulvinate. . 5. Ezosporium, p. 658. 

 Sporodochia vertically cylindric 



or clavate 6. Listeromyces. 



Trimmotostroma Corda 



Sporodochia pulvinate, compact, bearing a layer of conldio- 

 phores; conidia oblong, often curved, 2 to 8-septate, catenulate 

 brown. 



A genus of a half dozen species. 



T, abietina Doh."* 



Mycelium perennial; sporodochia foliicolus or caulicolus, 

 diffuse; conidiophores subhyaline, or tinged with olive-brown, 

 4.5 X 20-30 n, septate, sparsely branched, bearing the conidia 

 terminally; conidia catenulate, very variable, dark olivaceous- 

 brown, slightly roughened, usually oblong, spherical, straight or 

 inequilateral, continuous, spherical, 5 /x, or 2 to 5-celled and 5-6 

 X 8-16 li, not constricted, rarely muriform, 5 x 10 j«. 



On white and balsam firs in Canada. The pereimial habit of 

 the mycelium makes the pest a persistent one and as no conidia 

 are produced till the second year after infection its presence is 

 the more readily overlooked. 



