560 THE FUNGI WHICH CAUSE PLANT DISEASE 



300-400 n; conidia fusiform, 5-celled, the three median olivaceous- 

 fuscous, the others hyaline, 35 x 8-10 m, inferior appendage 25-30 

 X 1 At, superior group 8-10 x 1 m- 



It is described as the cause of rot of grape berries and of a leaf 

 spot of the vine. 



P. aloea Trinch. occurs on aloe in Italy; 



P. clusise Griff. & Mont, on Clusia leaves in France; 



P. richardiae Hals, sometimes disfigures calla leaves. 



P. tumefaciens Hen. is found on Abies causing galls. 



P. gongrogena Temme causes galls and cankers on willow; 



P. fuscescens Sor. parasitizes cultivated Cor3rpha; 



P. fuscescens var. sacchari Wak. is on sugar cane. 



On palms occur P. palmicola S. & S., P. palmanim Cke., and 



P. phcenicis Grev. 



P. inquinans C. & Hark is on eucalj-ptus in California; 



P. stictica B. & C. on sycamore and linden; 



P. suffocata E. & E. and P. discosioides E. & E. on roses. 



, P. lupini Sor. on Lupinus cotyledons.^ 



Coryneum Nees. (p. 558) 



Acervuli discoid or pulvinate, subcutaneous, erumjjent, black, 

 compact; conidia oblong to fusoid. 



Some seventy-five species. 



C. modonia (Sacc.) Griff. & Maub. on chestnut=Melanconis 

 modonia Tul. See p. 281. 



C. juniperinum E. on juniper=Exosporium jimiperinimi.*^ 



C. beyerinckii Oud. 



Acervuli minute, pimctiform, black, gregarious; conidia borne 

 on a parenchymatous pulvinate stroma, stipitate, oblong, ovate, 

 light olivaceous, 3 to many-septate, slightly constricted at the 

 septa or not, cells not all of the same size. 



Ascospora beyerinckii is said by Vuillemin to be the ascigerous 

 stage. See p. 236. It is reported as injurious to peaches, caus- 

 ing blight and shot-hole in California ^^ and to apricots, cherries 

 and peaches in Africa. It is close to and perhaps identical with 

 Clasterosporium carpophilum. 



The acervuli occur as black specks near the centers of the leaf 



