342 NORTH AMERICAN FLORA [Vo.umE 7 
Scirpus californicus (C. Meyer) Britton, California, New Mexico. 
Scirpus occtdentalis (S. Wats.) Chase (S. lacustris occidentalis S. Wats.), California. 
Scirpus Olneyi A. Gray, California; Aguascalientes, Mexico (state). 
Scirpus validus Vahl (S. lacustris Bart. not L.), Colorado, Indiana, Iowa, Kansas, Michi- 
gan, Nebraska, New York, Virginia, Wisconsin; Ontario. 
TYPE Locality: New York, on Scirpus validus. 
DIsTRIBUTION: Massachusetts to Ontario and Oregon, and southward to southern Mexico. 
Exsiccati: Barth. Fungi Columb. 2363, 2364, 3561, 4365, 5068; Barth. N. Am. Ured. 158, 
355, 854, 1261, 1662, 1663, 1859, 1999, 2051, 2258; Carleton, Ured. Am. 14; Ellis, N. Am. Fungi 
1472; Ellis & Ev. North Am. Fungi 2235; Ellis & Ev. Fungi Columb. 192, 1650; D. Griff. W. Am. 
Fungi 250, 353; Sydow, Ured. 480, 1728, 2421; Zahlbr. Krypt. 2006. 
98. Dicaeoma Scirpi (DC.) S. F. Gray, Nat. Arr. Brit. Pl. 1: 542. 
1821. 
Puccinia Scirpi DC. Fl. Fr. 2: 223. 1805. 
Aecidium Nymphoidis DC. Fl. Fr. 2: 597. 1805. 
Caeoma nymphoidatum Link, in Willd. Sp. Pi. 62:48. 1825. 
Uredo Scirpi Schleich.; Secr. Mycogr. Suisse 3: 498. 1833. 
Uredo Scirpi Westend. Bull. Acad. Brux. II. 11: 651. 1861. 
Puccinie Typhae Kalchbr.; Rab. Fungi Eur. 695. 1864. 
Aecidium Limnanthemi Thiim. Nuovo Giorn. Bot. Ital. 12: 196. 1880. 
Dicaeoma Typhae Kuntze, Rev. Gen. 33: 471. 1898. 
O. Pycnia epiphyllous, in crowded, circular groups, about 0.5 mm. across, honey-yellow 
becoming brownish, flattened-globoid, 100-120 » broad by 80-100 » high; ostiolar filaments 
short, rarely protruding above the epidermis. 
I. Aecia epiphyllous, in compact, circular groups, 5 mm. or more across, surrounding the 
pycnia, on yellowish spots, cupulate, small, 0.2-0.3 mm. in diameter; peridium fragile, evanes- 
cent; peridial cells rhomboidal, 16-26 by 27-34 wu, the outer wall thick, 7-9 », smooth, trans- 
versely striate, the inner wall thinner, 3-4 4, strongly verrucose; aeciospores globoid, 16-23 u; 
wall thin, 1—1.5 y, finely and closely verrucose, pale-yellow or colorless. 
ON MENVANTHACEAE: 
Nymphoides Grayanum (Griseb.) Arth. (Limnanthemum Grayanum Griseb.), Cuba. 
II. Uredinia amphigenous, scattered or crowded, dark cinnamon-brown, elliptic or linear, 
0.5-1 mm. long, tardily naked, ruptured epidermis conspicuous; urediniospores broadly ellip- 
soid or obovoid, 16-21 by 24-32 4; wall golden- or cinnamon-brown, about 1.5 » thick, moder- 
ately echinulate, the pores 2, equatorial. 
III. Telia amphigenous, similar to the uredinia in shape and size but chocolate-brown in 
color; teliospores ellipsoid, clavate or oblong, 15-21 by 34-50 y, rounded or obtuse above, 
usually narrowed below, slightly constricted at septum; mesospores rather abundant; wall 
moderately thin, about 1.5 4, smooth, chestnut-brown, thicker above, 5-9 4; pedicel golden- 
brown, about two-thirds length of spore. 
On CYPERACEAE: 
Scirpus americanus Pers. (S. pungens Vahl), Bermuda. 
Scirpus validus Vahl (S. lacustris Bart, not L.), Porto Rico. 
TyPe LocaLity: France, on Scirpus lacustris. 
DISTRIBUTION: West Indies; also in Europe. 
ILLUSTRATIONS: Grove, Brit. Rust Fungi f. 185; Beitr. Krypt. Schweiz 2?: f. 218; Krypt.-fl. 
Brand. Pilze 3: f. B130. 
99. Dicaeoma McClatchieanum (Dietel & Holway) Arthur. 
Puccinia McClatchieana Dietel & Holway; Dietel, Erythea 2:127. 1894. 
O and I. Pyenia and aecia unknown. 
II. Uredinia amphigenous, scattered, elliptic or oblong, 0.4-0.8 mm. long, rather tardily 
naked, finally somewhat pulverulent, cinnamon-brown, ruptured epidermis conspicuous; 
urediniospores ellipsoid or somewhat obovoid, 19-26 by 24-35 u; wall cinnamon-brown, 1.5- 
2 » thick, moderately echinulate, the pores 3 or 4, equatorial. 
III. Telia chiefly hypophyllous, scattered or often in more or less evident series parallel 
with the veins, elliptic, oblong or linear, 0.5—-1 mm. or more long, rather soon naked, pulvinate, 
blackish-brown, ruptured epidermis conspicuous; teliospores clavate, 13-23 by 45-774, 
rounded or obtuse above, slightly constricted at septum; wall light chestnut-brown, 1-1.5 4 
thick, much thicker above, 7—13 4, smooth; pedicel tinted, concolorous, short, about one half 
length of spore. 
