252 THE FUNGI WHICH CAUSE PLANT DISEASE 



Spores not as above, elongate 

 3 to many-celled hyaline or 

 brown 



Perithecia hairy 13. Pocosphseria. 



Ferithecia smooth 



Spores hyaline 14. Metasphseria, p. 257. 



Spores yellow or dark- 

 brown 15. Leptosphaeria, p. 257. 



Spores fusoid, 7 to many-celled, 

 the central cell enlarged and 



brown, the rest hyaline 16. Heptameria. 



Spores fusoid, up to 30-celled hya- 

 line or brown 17. Saccardoella. 



Spores filiform, often separating into 

 cells 



Perithecia hairy 18. Ophiochseta. 



Perithecia smooth 19. Ophiobolus, p. 259. 



Spores muriform 

 Asci 8-spored 



Spores appendaged 20. Delacoorea. 



Spores not appendaged 



Perithecia hairy 21. Pjrrenopbora, p. 262. 



Perithecia smooth. 22. Pleospoia, p. 259. 



Asci 16-fipored 23. Capronia. 



Physalospora Niessl. (p. 251) 



Perithecia subglobose, covered, membranous, or coriaceous, 



black, with the ostiole erum- 

 pent; asci clavateKjyIindric; 

 spores ovoid or oblong, con- 

 tinuous, hyaline or subhya- 

 line; paraphyses present. 



This genus contains over 

 one hundred thirty species, a 

 few of which are parasitic on 

 twigs and leaves. Some spe- 



Fic. 184. — Physalospora. Perithecia and maa n»n«»r..; „ nt 



ascus. After Winter. ^^ pOSSeSS , a GlOBOSponum 



as the conidial form. 

 P. gregaria and its conidial stages Tetradia salicicola and 



