KEY TO GENERA AND SPECIES OF DIDYMOSPORAE 



1 Ascospores surrounded by a gelatinous sheath and/or provided with appendages 11 



1 Ascospores with neither a gelatinous sheath nor appendages of any kind 2 



2 (i) Ascospores hyaline 3 



2 (1) AscospKjres yellow, yellow-brown, brown, or dark brown 6 



3 (2) Ascocarp a pseudothecium containing bitunicate asci 4 



3 (2) Ascocarp a perithecium containing unitunicate asci 5 



4 (3) Ascospores ellipsoidal, inequilateral Didymella fucicola 



4 (3) Ascospores fusiform to oblong, equilateral 



, Mycosphaerella ascophylli 



5 (3) Ascospores fusiform to ellipsoidal, never more than 10 p 



in diameter Lignincola laevis 



16 



