THE FUNGI WHICH CAUSE PLANT DISEASE 607 



F. pirinum (Lib.) Fcl. on pear=V. pirinia. See p. 253. 

 F. dendriticum (Wal.) Fcl. on pomaceous fruits=V. inaequalis. 

 See p. 253. 



F. orbiculattun Thiim on Sorbiis=V. insequalis var. cinerascens. 

 See p. 255. 



F. depressum (B. & Br.) Sacc. on Uinbellifer2e=Phyllachora. 



F. betulse Aderh. on birch=V. ditricha. See p. 255. 



F. tremulae Ft. on aspen =V. tremulse. See p. 255. 



F. fagopjrri Oud. is found on buckwheat; 



F. lini Sor. on Linum. 



F. eriobotryae Cav. attacks leaves of Eriobotrys.^ 



F. destraens Pk. 



Conidiophores short, 20-50 n, fasciculate, continuous or 1 

 to 2-septate, basally, colored, clusters slightly olive-green; conidia 

 acrogenous, continuous or 1-septate, subcatenulate, ellipsoid 

 to oblong, colored, 7-20 x 5-7 it. 



On oats. 



F. efEusum Wint.^s 



Spots minute, rounded, rarely effused, confluent, smoky; coni- 

 diophores erect, simple or slightly branched, septate, tor\ilose, 

 brownish, lighter above, 100-140 x 4 jti; conidia oblong fusoid to 

 rhomboid, continuous or uniseptate, light fuscous, subtruncate, 

 17-24 X 5.5-7 At- 



It constitutes the pecan scab affecting the leaves, stems and nuts. 



F. vanillae Zim. is on vanilla. 



An undetermined species is the cause of a black canker of Hevea. 



Passalora Fries & Montaigne (p. 602) 



Conidiophores filiform, intricate multiseptate, olive; conidia 

 oblong to fusoid, acrogenous. 



A small genus quite similar to Fusicladium except for the pluri- 

 septate conidiophores. 



P. bacilligera M. & F. and P. microspenna Fcl. occur on Alnus. 



Scolecotrichum Kunze & Schmidt (p. 602) 



Conidiophores short, subfasciculate, olive; conidia oblong or 

 ovate, pleurogenous or acrogenous. 

 A genus of some thirty species very similar to Fusicladimn. 



