424 PLANT DISEASES 



Phyllosticta, Pers. Perithecia formed under the epi- 

 dermis, lenticular, membranaceous, mouth or pore of 

 dehiscence often protruding, seated on discoloured spots 

 on leaves, rarely on branches. Conidia minute, ovoid or 

 oblong, continuous, hyaline or tinged greenish-yellow. 



Phyllosticta prunicola, Sacc., Mich., i. p. 157. Spots 

 epiphyllous, subcircular, dingy brown or ochraceous, 

 margin similarly coloured ; perithecia scattered, dotlike, 

 slightly prominent ; spores ovoid or elliptical, dilute olive, 



5X3^ 



On leaves of Prunus domesticus, P. cerasus, and Pirus 

 malus, also on various cultivated rosaceous fruit-trees. 



Distr. Western Europe, United States. 



Phoma, Fries. Perithecia subcutaneous, then erump- 

 ent, membranaceous, subcoriaceous, or subcarbonaceous, 

 globose or compressed, glabrous, not beaked, ostiola 

 minute, sometimes obsolete ; conidia hyaline, continuous, 

 often 2-guttulate, elliptical, cylindrical, fusoid or globose; 

 conidiophores slender, usually simple. 



Phoma rostrupii, Sacc., SylL, xi. 490; Phoma sanguino- 

 lenta, Rostrup, Zeitschr. f. Pflanzenkr., iv. p. 195, pi. 4. 

 (1894). Perithecia hemispherical, gregarious, or crowded, 

 greyish-black; conidia elliptical, 4-6x1*5-3 /* oozing out 

 of the mouth of the perithecium in damp weather in the 

 form of a long, curved, blood-red or violet-red tendril. 



Phoma sanguinolenta, Rostrup, Tidssk. for Landok v. 

 Rackke., Bd. vii. p. 384 (1887). Perithecia gregarious on 

 depressed areas on the stem, or causing large cankerlike 

 depressions on the root; conidia 4-6x1*5-3 /*, escaping 

 in the form of a flesh or blood-red tendril. 



Hab., the carrot (Daucas Carota), Europe, United States 



