226 THE FUNGI WHICH CAUSE PLANT DISEASE 



Spores 2-celled; asci not apically 



thickened 2. Coleroa, p. 227. 



Perithecia thick, leathery or carbon- 

 ous 

 Spores hyaUne, sometimes becoming 

 brown, 1 or 2-celled 



Spores ellipsoid 3. Trichosphseria, p. 228. 



Spores cylindric, bent 4. Leptospora. 



Spores dark colored, 2-celled 5. Neopeckia. 



Spores more than 2-celled 

 Perithecia thin, leathery or cuticula- 



rized 6. Acanthostigma, p. 229. 



Perithecia thick, carbonous or woody 

 Spores 4-celled, the two middle cells 



brown, the end cells hyaline .... 7. Chsetosphseria. 

 Spores many-celled, concolorous, 

 hyaline or brown 



Spores spindle-form 8. Herpotrichia, p. 229. 



Spores elongate-cylindric 9. Lasiosphseria. 



Perithecia smooth 

 Perithecia tuberculate or irregularly 

 thickened 

 Spores ellipsoid, 2 to many-celled, 



hyalme 10. Bertia. 



Spores spindle-form, 4 to 11-celled, 



hyaline 11. Stuartella. 



Spores muriform, dark 12. Crotonocarpia. 



Perithecia not tuberculate 

 Spores 1-celled, dark 

 Spores with hyaline appendages on 

 each end; perithecia thick, leath- 

 ery 13. Bombardia. 



Spores unappendaged, perithecia 



carbonous 14. Rosdlinia, p. 230. 



Spores 2 to many-celled 

 Perithecia thin, leathery; spores 2- 



oelled 15. Lizonia. 



Perithecia thick, leathery or car- 

 bonous, brittle 

 Spores ellipsoid 

 Spores 2-celled 



