Part 8, 1922] AECIDIACEAE 581 
137. Micropuccinia Silphii (Schw.) Arth. & Jackson; Arth. 
Bull. Torrey Club 48: 41. 1921. 
Puccinia Silphii Schw. Trans. Am. Phil. Soc. IL. 4: 296. 1832. 
Dicaeoma Silphii Kuntze, Rev. Gen. 33: 470. 1898. 
Dasyspora Silphii Arth. Résult. Sci. Congr. Bot. Vienne 347. 1906. 
Leptopuccinia Silphii Sydow, Ann. Myc. 20: 121. 1922. 
O. Pyenia unknown, probably not formed. 
Iil. Telia hypophyllous and caulicolous, solitary or gregarious and more or less confluent 
in orbicular groups 1-10 mm. across, on discolored spots, small, round, 0.5-!1 mm. across, 
early naked, pulvinate, compact, at first cinnamon-brown becoming chocolate-brown, often 
cinereous by germination, ruptured epidermis usually inconspicuous; teliospores oblong, 10-16 
by 30-48 », obtuse or acute at apex, often irregularly so, obtuse or truncate at base, slightly 
or not constricted at septum;. wall cinnamon- or chestnut-brown, smooth, thin, 1-1.5 z, 
thickened at apex, 4-10 4; pedicel colorless or tinted, firm, once length of spore or shorter. 
On CARDUACEAE: 
Silphium Asteriscus L., Alabama. 5 
Silphium compositum Michx., Alabama. 
Silphium integrifolium Michx., Illinois, Indiana, Kansas, Mississippi, Nebraska, Wisconsin. 
ie laciniatum L,., Alabama, Iowa, Kansas. 
Silphium perfoliatum L., Indiana, Iowa, Mississippi, Missouri, Nebraska, North Dakota, 
Ohio, South Dakota, Wisconsin. 
Silphium ‘wifoliatum L., North Carolina, West Virginia. 
TYPE LocaLity: North Carolina, on Silphium trifoliatum. 
DISTRIBUTION: West Virginia and northern Alabama vies 2 North Dakota and Kansas. 
ILLUSTRATION: Bull. Lab. Nat. Hist. Univ. Iowa 32: pl. 1, f. 4a, b, ¢. 
Exsrccati: Arth. & Holway, Ured. Exs. Ic. 4a, b, c; Barth. Pace Columb. 2365, 3266, 3371, 
4866 5071; Barth. N. Am. Ured. 262, 866, 1471; Brenckle, Fungi Dak. 262; Carleton, Ured. Am. 
41; Ellis, N. Am. Fungi 1033, 1462; Ellis & Ev. Fungi Columb. 1659; Kellerm. & Swingle, Kans. 
Fungi 45} i Sydow, Ured. 482, 1278. 
138. Micropuccinia Melampodii (Dietel & Holway) 
Arthur & Jackson. 
Puccinia solide Berk. & Curt. Jour. Linn. Soc. 10: 356. 1869. Not P. solida Schw. 1832. 
Puccinia Synedrellae agerh.; Sydow, Ured. 376, hyponym. 1890. 
Puccinia Melampodii Dietel & Holway; Holway, Bot. Gaz. 24: 32. 1897. 
Puccinia Synedrellae P. Henn. Hedwigia 37: 277. 1898. 
Dicaeoma cubense Kuntze, Rev. Gen. 3?: 466. 1898. 
Dicaeoma Synedrellae Kuntze, Rev. Gen. 33: 470, 1898. 
Puccinia Zinniae Sydow, Monog. Ured. 1: 188. 1902. 
Puccinia Diaziana Arth. Bot. Gaz. 40: 203. 1905. 
Puccinia Tridacis Arth. Bull. Torrey Club 33: 516. 1906. 
Dasyspora Synedvellae Arth. Résult. Sci. Congr. Bot. Vienne 347. 1906. 
Puccinia Eleutherantherae Dietel, Ann. Myc. 7: 354. 19) 
Puccinia Tetranthi Sydow, Ann. Myc. 17: 33. 1919. 
Micropuccinia Synedrellae Arth. & Jackson; Arth. Bull. Torrey Club 48: 41, 1921. 
Leptopuccinia Melampodii Sydow, Ann. Myc. 20: 120. 1922. 
Leptopuccinia Synedrellae Sydow, Ann. Myc. 20: 121. 1922. 
O. Pycnia unknown, probably not formed. 
III. Telia hypophyllous or occasionally amphigenous, gregarious, distinct or more com- 
monly confluent, on discolored spots 0.2-1.5 cm. across, small, round, 0.2-0.5 mm. in diameter, 
usually early naked, chestnut-brown becoming cinereous by germination, compact, usually pul- 
vinate, ruptured epidermis usually inconspicuous; teliospores oblong or clavate, 14-22 by 34-50 
2, rounded or obtuse above, obtuse or more commonly narrowed to pedicel below, slightly or 
not constricted at septum; wall golden- or cinnamon-brown, 1-2.5 u thick, thickened above, 
4-10 », smooth; pedicel firm, colorless or tinted like base of spore, equaling the spore or 
shorter. 
RDUACEA 
~ ier hea ruderalis (Sw.) Schultz-Bip., Panama; Cuba; Grenada; Guadeloupe; Jam- 
aica; Porto Rico; Santo Domingo. 
Melampodium divaricatum (Rich.) DC., Morelos; Guatemala. 
Parthenium ind eae ie ke 
ac artinique. 
Shnedvella eee 3 Cen cvebeine nodiflora L.), Panama; Barbados; Cuba; 
Jamaica; Porto Rico; Santo Domingo; Tortola. 
Tetranthus hirsutus Spreng. (T. littoralis Sw.), Haiti. 
Tridax procumbens I,., Cuba. 
