PASSALORA. 507 



brown septate conidiophores, bearing long, two- celled, obovate 

 conidia. 



Fusicladium. 



Mycelinm greenish and sparingly septate. Conidiophores in 

 tufts, short, erect, and bearing terminal conidia. Conidia ovoid 

 or clavate, and one or two-celled. 



The species are conidial forms of Venturia, and have already 

 been considered. Some of the better-known forms are : 



Fusicladium dendriticum Wallr. (Britain and U.S. America). 

 This attacks the leaves, shoots, and fruits of the apple (see p. 2 1 8). 



Fig. 312. — Venturia (Fusicladiuvi) dendriticum forming brown spots on an 

 apple ; those still in the earlier stages have a radiate margin and bear conidia. 

 The enlarged section shows two rows of large-celled parenchyma of the apple, 

 covered bv a stroma of pseudoparencbyma bearing conidiophores and conidia. 

 (v. Tubeuf del.) 



F. pirinum (Lib.) (U.S. America). This is a cause of 

 " spotting " on leaves and fruits of the pear, also of species of 

 Crataegus and Amelanchier. The conidial patches are brownish 

 in colour. Peglion states that this parasite forms sclerotia in 

 the bark of twigs. It is probably a conidial form of Venturia 

 ditricha var. pyri. 



F. cerasi (Rabh.) attacks the cherry orchards with such 

 virulence that the crop may be rendered quite unsaleable. 



F. eriobotryae Cav.^ Cavara states that this attacks the 



^ Cavara, Sivinta di Patologia Vegetale, 1892. 



