THE FUNGI WHICH CAUSE PLANT DISEASE G37 



or subglobose panicle, ovoid, lemon-shaped or fusoid, subhya- 

 line. 



Some twenty-five species. See Fig. 430. 



S. veronicae Pers. occurs on cultivated Veronicas in Italy; 



S. ulmariae M'W. on Spirea in Ireland. 



S. stemonitis Cda. causes a brown rot of potatoes in storage. 



PhaBostilbeaB-Phragmosporae (p. 633) 



Conidia 3 to several-celled, oblong to cylindric, dark or hya- 

 line. 



Key to Genera, of Phaeostilbese-Phragmosporse 

 Conidia capitate 

 Synnema simple 

 Synnema black; conidia densely capi- 

 tate 1. Arthrobotryum. 



Synnema fuscous or pale; conidia 



loosely capitate 2. Isariopsis, p. 637. 



Synnema dendroid-branched 3. Xylocladium. 



Conidia not capitate 



Conidia catenulate 4. Dendrographium. 



Conidia not catenulate 

 Stalk fibrous 

 Sjrnnema simple or branched; conidia 



acro-pleurogenous 5. Podosporium. 



Sjntmema branched; conidia acro- 



genous 6. Negeriella. 



Stalk parenchyma-like 

 Conidia pleurogenous, on a disk. ... 7. Riccoa. 

 Conidia acrogenous 8. Podosporiella. 



Isariopsis Fries 



Slender, dark or subhyaline, cylindric hyphse laxly aggregated; 

 conidia in a lax panicle or head, cylindric or clavate. See Fig. 431. 



I. griseola Sacc. 



Spots hypophyllous, ochraceous; coremium stipitate, dense. 

 200 X 30-40 fi, composed of filiform hyphae; conidia borne on 

 the reflexed ends of the hyphae, cylindric-fusoid, curved, 50-60 

 X 7-8 fi, grey, 1 to 3-septate, constricted. 



It causes disease of beans. 



