Part 6, 1921] AECIDIACEAE 461 
ON VIOLACEAE: 
Viola lobata Benth., California. 
Viola praemorsa Dougl., Washington. 
TYPE Locatiry: Dunsmuir, California, on Viola lobata. 
DIstRisuTION: Northern California and northward. 
ILLUSTRATION: Holway, N. Am. Ured. 1: pl. 30, f. 104a, b. 
Exsiccatr: Barth. N. Am. Ured. 1438; Sydow, Ured. 2371. 
14. Allodus Jussiaeae (Speg.) Arthur & Orton. 
Aecidium Jussiaeae Speg. Anal. Soc. Ci. Argent. 9: 174. 1880. 
Puccinia Jussiaeae Speg. Anal. Soc. Ci. Argent. 12:68. 1881. 
Aecidium Ludwigiae Ellis & Ev. Proc. Acad. Phila. 1893: 155. 1893. 
Aecidium Isnardiae Lagerh. Tromsé Mus. Aarsh. 17: 102, 1895. 
Puccinia Nesaeae Ellis & Ev. Bull. Torrey Club 22: 363, excl. synonymy. 1895. Not Aecidium 
Nesaeae W. Gerard, 1873. 
Dicaeoma Jussiaeae Kuntze, Rev. Gen. 38: 469. 1898. 
Dicaeoma Nesaeae Kuntze, Rev. Gen. 33: 469. 1898. 
Allodus Nesaeae Arth. Résult. Sci. Congr. Bot. Vienne 345. 1906. 
Puccinia Ludwigiae Holway, N. Am. Ured.1:72. 1907. Not P. Ludwigiae Tepper, 1890. 
Allodus Ludwigiae Orton, Mem. N. Y. Bot. Gard. 6: 189. 1916. 
O. Pyenia epiphyllous, in groups on reddish spots opposite the aecia, inconspicuous, 
immersed, globoid, chestnut-brown, 80-120 » in diameter; ostiolar filaments not seen. 
I. Aecia hypophyllous, in dense groups, often raised, rarely annular, on reddish spots, 
small, circular, 0.2-0.3 mm. across, cupulate; peridium white, short-cylindric, the margin erose, 
slightly or not recurved; peridial cells rhomboidal, 18-26 by 30-38 u in longitudinal section, 
the outer wall finely verrucose-striate, 4-5 » thick, the inner wall rather coarsely verrucose, 
3-4 w thick; aeciospores globoid, angular, 13-19 by 15-21; wall colorless or light-yellow, 
1-1.5 » thick, very minutely verrucose, appearing smooth when wet. 
III. Telia chiefly hypophyllous, inconspicuous, arising at first in and later around the 
aecia, uncovered, compact, dark cinnamon-brown; teliospores oblong, cylindric, or terete, 15- 
21 by 35-58 uw, rounded or obtuse above, usually narrowed below, moderately constricted at 
septum; wall cinnamon-brown, 1.5—2 yw thick, smooth, thickened 7-12 » above, slightly paler; 
pedicel slightly tinted, sometimes as long as spore. 
ON ONAGRACEAE: . . : 
Isnardia palustris L,. (Ludwigia palustris Ell.), Florida, Louisiana, Ohio, Texas. 
Isnardia repens (Sw.) DC, (Ludwigia natans Ell.), California; Cuba. 
Ludwigia alternifolia L., Florida. 
Ludwigia glandulosa Walt. (L. cylindrica Ell.), Maryland. 
Ludwigia hirtella Raf., Mississippi. : 
Ludwigia polycarpa Short & Peter, Iowa, Missouri. 
Ludwigia sphaerocarpa Ell., Delaware, Florida. 
Ludwigia virgata Michx., Florida. | . ieee 
Type LocaLity: Rio de la Plata, Argentina, on Jussiaea longifolia. : . 
DistRiBUTION: Delaware to Iowa, and southward to Louisiana and Florida; also in South 
America. 
ILLustrRation: Holway, N. Am. Ured. 1: 1. 32, f. 109. 
15. Allodus imperspicua (Sydow) Orton, Mem. 
N. Y. Bot. Gard. 6:189. 1916. 
Puccinia imperspicua Sydow, Monog. Ured. 1: 361. 1902. 
O. Pycnia seen caulicolous only, gregarious, scattered among the aecia in groups I-5 mm. 
long, flattened laterally, turning dark cinnamon-brown with age, 60-115 in diameter by 115- 
130 » high; ostiolar filaments up to 70 u» long. 
I. Aecia seen cattlicolous only, gregarious, in oblong groups 1-5 mm. long, cupulate or 
short-cylindric, 0.5-0.7 mm. in diameter; peridium not seen; peridial cells rhomboidal in longi- 
tudinal section, 16-21 by 32-40 u, the outer wall 3-5 » thick, rather prominently striate, the 
inner wall 5-7 u thick, evenly striate-verrucose; aeciospores globoid or broadly ellipsoid, 19- 
23 by 21-27 u: wall nearly colorless, 1 « thick, finely verrucose. 
III. Telia amphigenous or caulicolous, scattered or occasionally confluent, roundish, 0.2- 
0.8 mm. across, early naked, pulvinate, pulverulent, chocolate-brown or blackish; teliospores 
broadly ellipsoid, 24-34 by 34-51 4, usually rounded at both ends, sometimes narrowed be- 
low; wall light chocolate-brown, 3-5 4 thick, 7-104 thick above, smooth; pedicel colorless, 
stout, rather persistent, about twice length of spore. 
