THE FUNGI WHICH CAUSE PLANT DISEASE 497 



On living parts of many fruit hosts, as well as ivy and other 

 woody plants.''^ 



V. melicae Fcl. grows on Melica; 



V. microchseta Pass, on camellia. 



V. circinans Berk.**' ^'' 



Spots orbicular; pycnidia arranged concentrically, small, setse 

 long; conidia oblong, curved, obtuse. 



On onions the fungus appears as small black dots on the scales. 

 These later become encircled by rings of black pycnidia. Stone- 

 man foimd no true pycnidium; this would indicate relationship 

 of the organism with Volutella rather than with Vermicularia. 



V. varians Due. is described by Ducomet as the cause of a scab- 

 like disease of tomato and potato.** 



V. subeffigurata Schw. Pycnidia large, scattered, dark, sub-i 

 elevated; spines unequal. On carnation leaves. 



V. telephii Karst." 



Pycnidia scattered, erumpent, superficial, spherical, dark, 100- 

 150 m; conidia fusoid bacilliform, acutely curved, 

 22-32 X 4 M. 



On leaves and stems of cultivated Sedvuns. 



V. concentrica Lev. is reported by Halsted -^ 

 as causing unsightly spots on Dracaena. 



V. denudata Schw. A Vermicularia referred 

 to as probably this species is reported as dam- j.,(j. 342."— Pyreno- 

 agine to Kentucky blue grass in Dakota.™ chata berbeiidia, 



„ . .... n ■ . _t J u conidiophore and 



V. polygom-virgimca Schw. is reported by conidia. After Ai- 

 Reed & Cooley on rhubarb.^* ''^'''"''• 



An imdetermined species is reported as injurious to the potato.*' 



Pyrenochseta de Notaris (p. 482) 



Pycnidia globose-clavate, erumpent, leathery or carbonous, 

 black, bristly, ostiolate; conidia ovate, elongate or cylindric; 

 conidiophores branched. 



A genus of some thirty species. 



P. phloxidis Mas. is common just above ground on living stems 

 of Phlox causing cankers. 



P. ferox Sacc. is foimd on potato stems. 



P. oryzse Miyake ^' occurs on rice in Japan. 



