THE FUNGI WHICH CAUSE PLANT DISEASE 147 



Spores becoming 2-celled 5. Niptera. 



Spores elongate filiform, 4-celled 6. Belonidium. 



Spores filiform many-celled 7. Belonopsis. 



Ascocarps at first sunken in the substra- 

 tum, later erumpent 

 Ascocarps bright colored, only slightly 

 erumpent 

 Spores ellispoid or elongate, rounded, 



1-celled 8. Pseudopeziza, p. 147. 



Spores becoming many-celled 9. Fabraea, p. 149. 



Ascocarps dark colored, at length 

 strongly erumjjent 

 Spores ellipsoid or fusiform, 1-celled 

 Ascocarps bristly ejrternally and on 



the margin 10. Pirottsea. 



Ascocarps externally smooth, the 

 margin af most merely shred- 

 ded 11. Pyrenopeziza. 



Spores many-celled by transverse 



septa 12. Beloniella. 



Ascocarps gelatinous gristly, horny when 



dry II. Calloriese. 



Of this large number of genera only two are important patho- 

 gens, several of the others are parasitic on non-economic hosts 

 while others are saprophytic chiefly on decaying woody parts. 



Pseudopeziza Fuckel 



The genus comprises some ten species, all parasitic on leaves, 

 several of them upon economic plants causing serious disease. 

 The very small apothecium develops subepidermally breaking 

 through only at maturity, light colored; spores 1-celled, hyaline, 

 in two ranks in the ascus; paraphyses somewhat stout, hyaline. 

 Conidial forms are found in Glceosporium, CoUetotrichum and 

 Marssonia. 



P. medicaginis (Lib.) Sacc.*^' ^^ 



The epiphyllous apothecia are in the older leaf spots, subepider- 

 mal at first but eventually breaking through. 



Apothecia saucer-shaped, light colored, fleshy; asci clavate; 



