136 THE FUNGI WHICH CAUSE PLANT DISEASE 



Paraphyses lancet-shaped at 

 apex 



Spores 1-celled 13. Lachnum. 



Spores at length several- 

 celled 14. Erinella. 



Ascocarps naked HI- Helotiese. 



Spores globose 15- Pitya. 



Spores ellipsoid or fusiform 

 Spores 1-celled 



Border of disk smooth 16. Hymenoscypha, p. 146. 



Border of disk toothed 17. Cyathicula. 



Spores at length 2 to 4-celled 

 Ascocarps sessile, rarely com- 

 pressed at base 18. Belonium. 



Ascocarps stalked, or at least 

 compressed like a stalk 

 Walls of ascoma waxy; stem 



short and delicate 19. Belonioscypha. 



Walls of ascoma waxy, thick; 



stem thick 20. Helotium. 



Spores filiform 



Ascocarps sessile 21. Gorgoniceps. 



Ascocarps stalked 22. Pocillum. 



Ascocarps gelatinous gristly, horny when 



dry IV. Ombrophiles. 



Of these genera only the five given below have parasitic represen- 

 tatives of economic importance, while only one to two others are 

 parasitic. The rest grow as saprophytes on rotting wood and 

 organic debris in the soil. 



Sclerotinia Fuckel (p. 135) 



This genus contains several very important pathogens, some 

 of them preying upon a wide range of hosts and causing great loss. 

 A striking feature of the genus is the sclerotium which is black and 

 borne within the host tissue or upon its surface. From the sclerotia 

 after a more or less protracted period the apothecia develop. These 

 are disc-shaped and stalked. The asci are 8-spored ; spores elliptical 

 or fusiform, unicellular, hyaline, straight or curved. Some species 



