IpIQ] 



KEMPTON—PYCNIDIUM 



251 



Table I gives the species and the methods of development 

 found in each of the pycnidium-forming species. Phoma her- 

 barum, Phoma pirina, Phoma from clover, Phoma from grape, 

 Sphaeronaema fimbriatum, Coniothyrium species indet., Septoria 

 helianthi, Sphaeronaemella fragariae, and a pycnidium of Meliola{ ?) 

 camelliae show a simple meristogenous origin and development, 

 and other methods of development seldom or never appear. 



TABLE I 



Species 



Phoma herbarum West 



Phoma destructiva Plowr 



Phoma pirina (Fries) Cooke 



Phoma from clover 



Phoma from grape 



Phoma cichorii Passr 



Macrophoma citrulli (B. and C.) Berl. and 



Vogl 



Sphaeronaema fimbria turn (E. and H.) 



Sacc 



Sphaeropsis malorum Pk 



Sphaeropsis citricola McAlpine 



Coniothyrium pyriana (Sacc.) Shel 



Coniothyrium, species indet 



Septoria polygonorum Desm 



Septoria scrophulariae Pk 



Septoria helianthi E. and K 



Sphaeronaemella fragariae S. and P 



Pycnidium of Meliola ( ?) camelliae (Catt.) 



Sacc 



Simple 

 meristogenous 



Compound 

 meristogenous 



Symphogenous 



+ 

 + 

 + 

 + 

 + 

 + 



+ 



+ 



+ 

 + 

 + 



+ 

 + 

 + 

 + 



+ 



+ 



+ 

 + 



+ 

 + 

 + 



+ 

 + 



+ 

 + 



+ 



In Phoma destructiva, Phoma cichorii, Sphaeropsis citricola, 

 Coniothyrium pyriana, and Septoria scrophulariae the pycnidial 

 primordia arise by either the simple or compound meristogenous 

 modes, the simple mode being the more common. 



Macrophoma citrulli, Sphaeropsis malorum, and Septoria poly- 

 gonorum give rise to their pycnidial primordia by either the sym- 

 phogenous or meristogenous methods. In Sphaeropsis malorum 

 the symphogenous method is the main one. The compound 

 meristogenous method appears occasionally. In Macrophoma 

 citrulli the simple meristogenous mode prevails, but the others are 

 often found. In Septoria polygonorum the compound meristoge- 

 nous mode is more often found, although a few primordia arise 

 by the symphogenous method, and occasionally the simple meris- 

 togenous mode appears. 



