632 THE FUNGI WHICH CAUSE PLANT DISEASE 



fasciculate, brown, 90-114 x 3.5^ /i, subgeniculate above; conidia 

 oblong, clavate, faintly 3-septate, 30-40 x 5-7 /*. 



It seriously injures the Japanese red-bud and occurs also on the 

 American species,'"^ 



C. aceiina Hartig is on maple seedlings. 



C. sequoise E. & E. 



Large compact olivaceous tufts are formed on languid leaves; 

 conidiophores ferruginous, brown, abruptly bent, subnodose, 

 toothed, sparingly septate, 50-70 x 4r-5 ;u; conidia oblong, becom- 

 ing clavate, 40-70 x6 n, concolorous with the hyphae, 3 to 5-septate, 

 constricted at the septa. 



It is said to seriously iaterfere with the growth of Sequoia in 

 the eastern states. 



C. halstedii E. & E. 



Spots hypophyllous, indefinite, brownish to olivaceous, 2-4 mm. 

 across; conidiophores few-septate, 100-150 x 5-7 /i, undulate or 

 crisped; conidia obclavate, 65-80 x 5-7 n, 3-septate, somewhat 

 constricted. 



It produces blotches on pecan leaves and causes partial de- 

 foliation.^ 



StUbacese (p. 565) 



Sterile hyphse creeping, scanty; fertile hjrphse collected into a 

 stalk-like or stroma-like fascicle, bearing conidia at the top, more 

 rarely along the sides, pale, bright-colored or dark. 



Ket to Sections of Stilbaces 



HyphsB and conidia hyaline or light 



colored I. Hyalostilbes. 



Conidia globose, elliptic or oblong 



1-celled 1. Amerosporse, p. 633. 



2-celIed 2. Didymosporae. 



3 to several-celled 3. Phragmospore. 



Conidia filiform, coiled 4. Helicospors. 



Hyphae or conidia dark II. Phaeostilbese. 



Conidia globose, elliptic, or oblong, 

 With cross walls only 

 1-celled 5. Amerospors, p. 635. 



