THE FUNGI WHICH CAUSE PLANT DISEASE 



263 



Spores brown 

 Spores 2-celled 



Perithecia scattered irregularly. . . 6. Phorcys. 



Perithecia in circular clusters 7. Massariovalsa. 



Spores more than 2-celled 

 Spores ellipsoid to spindle-shaped, 



many-celled 8. Massaria, p. 263. 



Spores cylindric, bent, 8-celled. . 9. Cladosphaeria. 

 Spores muriform 10. Pleomassaiia. 



Massaria theicola Fetch invades the ducts of the tea plant. The 

 genus Charrinia is said by Viala & Ravaz ^^^ to contain the ascige- 

 rous form of Coniothyrium diplodiella (Speg.) Sacc. 



Gnomoniaceae (p. 223) 



Perithecia sunken, with an elongate, cylindric, beak-like ostjole, 

 rarely with a papillate one; leathery or membranous, rarely borne 

 on a stroma; asci mostly thickened apically and opening by a pore; 

 spores hyaline; paraphyses usually absent. 



A family of about one hundred fifty species; four genera con- 

 tain important pathogens. 



Key to Genera or Gnomoniacese 



Spores 1-celled 

 Mouth of the perithecium short 



Asci cylindric, 8-spored 1. Phomatospora. 



Asci clavate, 2-spored 2. Geminispora. 



Mouth of the perithecium elongate, beak- 

 like 

 Mouth of the perithecium straight 



Asci many-spored 3. Ditopella, p. 264. 



Asci 8-spored 



Spores ellipsoid or fusoid 



A clypeus present 4. Mamiania. 



Stroma present 5. Glomerella, p. 264. 



Stroma absent 6. Gnomoniella, p. 273. 



Spores elongate fusoid, or filiform 7. Cryptoderis. 

 Mouth of the perithecium recurved. . . 8. Camptosphsria. 



