Davis—North American Ascochytae 
665 
45 Ascochyta phlogis Vogl. 
Ann. R. Ace. Agr. Torin: 51. 
Spots oblong to irregular, sordid to white, sometimes with a 
brown border; pycnidia gregarious, somewhat prominent, 
conical, black; sporules hyaline, elliptical, becoming uniseptate, 
slightly constricted, 10-3/a. On leaves of Phlox Drummondii 
(cult.). Fairman described “subspecies phlogina” from Ameri¬ 
can material as follows: “Spots white, irregular or rounded, 
girt by a brown area of discolored leaf tissue; pycnidia minute, 
punctiform, generally clustered in the center of the white spots, 
black; spores uniseptate, hyaline, 10-14 x 3/a.” (Ann. Mycol. 
8:323). 
46 Ascochyta Pirina Pegl. 
Contr. Micol. Avell. p. 23. 
Pycnidia black, 300/a; sporules hyaline, uniseptate, slightly 
constricted, 12-14 x 4-5/*. On fruit and leaves of Pyrus com¬ 
munis. 
Spots alutaceous, at length abscissed and falling away; 
pycnidia with parenchymatous walls thickened about the ostiole, 
cylindrical, hyaline or pale honey color, uniseptate, pale 
fuligenous, 150-180/a, ostiole 20/a in diameter; sporules 
hyaline, uniseptate, not constricted, 12-16 x 4/a borne on 
very short, somewhat conical, basidia. On Pyrus arbutifolia 
(Saccardo, N. Giorn. Bot. Ital. 23:195). 
47 Ascochyta pisi Lib. 
Exs. No. 12. Saccardo, F. Herb. Brux. no. 35. 
Spots definite, circular, yellowish-brown with a darker 
margin, sometimes white sometimes dark in the center; pycnidia 
gregarious, somewhat prominent, depressed-globose, light brown, 
ostiolate, 100-200/a; sporules hyaline, oblong, ends rounded, 
straight or somewhat curved, 1- (1—3) septate, somewhat con¬ 
stricted, 14-16 x 4-6/*. On leaves, stems and pods of Pisum and 
Vicia and leaves of Lupinus perennis. 
48 Ascochyta primulae Trail. 
Scot. Nat. 1887, p. 88. 
Spots amphigenous, large, white, becoming arid, often with 
a yellowish border; pycnidia epiphyllous, scattered, pale brown, 
depressed-globose, ostiolate, 100-110/a; sporules hyaline, cylin¬ 
drical, obtuse, uniseptate, 5-6 x 2-21/2/*. On leaves of Primula. 
