THE FUNGI WHICH CAUSE PI.ANT DISEASE 



283 



Key to Genera of Melogrammataces 

 Spores 1-celled 

 Spores roundish ellipsoid, asci long fusi- 



^onn. 1. Gibelia. 



Spores ellipsoid or ovate, asci clavate. ... 2. Botryosphseria, p. 283. 

 Spores 2 or more-celled 

 Spores with cross walls only 

 Spores 2-celled 

 Spores hyaline 



Paraphyses present 3. Endothia. 



Paraphyses absent 4. Mynnaeciella. 



Spores brown 5. Myrmsecium. 



Spores more than 2-celled, ellipsoid to 

 filiform 



Spores hyaline many-celled 6. Sillia. 



Spores hyaline 3-celled 7. Melanops, p. 284. 



Spores brown 8. Melogramma, p. 284. 



Spores muriform 9. Berlesiella. 



Botryosphaeria Cesati & de Notaris 



Stroma pulvinate, black; perithecia at first sunken in the stroma, 

 remaining so or becoming 

 more or less prominent, 

 usually small, globose, os- 

 tiole inconspicuous, papilli- 

 form; asci clavate; spores 

 elliptic to oval, hyaline, 

 continuous; paraphyses 

 present. 



B. ribis G. &. Dug.^* 



Stromata black, more or 

 less pulvinate, outer sur- 

 face botryose, 1-4 mm. in 



j:„,„„4.„_ ,. „ii,, o o ™™ Fig. 212. — Botryosphaeria. B, stroma in sec- 

 diameter, usually 2-3 mm., tion; C, part of perithecium and pycnidium 

 and surrounded by the in section. After Tulasne. 



fissured periderm, regularly scattered or in more or less definite, 

 longitudinal rows or elongated stromata. Perithecia somewhat 



