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, 

 shghtly prominent ; spores ovoid or elliptical, dilute olive, 



5x3/^- 



On leaves of Primus dotnesticus, 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; Pho7na sangiiino- 

 lenta, Rostrup, Zeitschr. f. Pflanze?ikr., iv. p. 195, pi. 4. 

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

 greyish-black ; conidia elliptical, 4-6 X i '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 4-6 X 1 "5-3 j", escaping 

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



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



