426 PLANT DISEASES 



Ascochyta, Lib. Perithecia generally gregarious on dis- 

 coloured patches on leaves or branches, membranaceous, 

 innate, an apical mouth or pore protruding, compressed- 

 globose; conidia elliptical or elliptic-oblong, i-septate, 

 hyaline or tinged greenish-yellow. 



Ascochyta pisi, Lib., Ex. PL Ard., No. 12. Spots 

 subrotund, yellowish with a darker margin, perithecia 

 gregarious, brown, ostiolum protruding ; conidia oblong, 

 hyaline, i-septate, 14-16x4-6^; extruded in reddish 

 viscid tendrils. 



Septoria, Fries. Perithecia subcuticular, globoso-lenti- 

 cular, furnished with a pore, laxly membranaceous, typi- 

 cally developed on decoloured areas on leaves ; conidia 

 rod-shaped or filiform, pluriseptate or pluriguttulate, rarely 

 eguttulate, hyaline ; basidia minute. 



Septoria petroselini, Desm., Crypt. France, Exs., No. 

 674. Spots brown, then white, determinate, on both 

 surfaces ; perithecia minute, delicately membranaceous, 

 perforated, lenticular, parenchymatous, olive ; conidia 

 filiform, straight or flexuous, 6-io-guttulate or delicately 

 septate, hyaline, 35-40 x 1-2 fj.. 



Entomosporium, Lev. Perithecia hemispherico-appla- 

 nata, mouthless, black (spurious ?) ; conidia consisting of 

 two superposed cells, with two or more cells springing 

 from the median septum, all the cells setigerous. 



Entomosporium maculatum, Lev., in Moug. Stirp. Vog., 

 No. 1458. Perithecia epiphyllous, flattened, imperfectly 

 ostiolate ; conidia 4-celled, 18-20X12 /x, hyaline, lateral 

 cells smaller, depressed, with very long setae ; pedicel 

 filiform. 20 X i p. 



