284 NORTH AMERICAN FLORA [VoLUME 7 
TYPE LOCALITY: Herbertshéhe, Bismarck Archipelago, on “Andropogon Schoenanthus.”’ 
_ Distrreution: Central Florida, and from central Mexico to Panama; also in New Britain Islands 
(Bismarck Archipelago). 
10. Dicaeoma infuscans (Arth. & Holway) Arthur & Fromme. 
Puccinia infuscans Arth. & Holway; Arth. Am. Jour. Bot. 5: 463. 1918. 
O and I. Pyenia and aecia unknown. 
II. Uredinia hyophyllous, scattered, oblong or linear, 0.5-1 mm. long, soon naked, chest- 
nut-brown, pulverulent, ruptured epidermis evident; urediniospores broadly ellipsoid or 
obovoid, 20-26 by 26-32 »; wall dark cinnamon-brown, moderately thick, 2-3 u, finely and 
closely verrucose, the pores 4, equatorial, distinct. 
III. Telia hypophyllous, scattered, oblong or linear, 0.4—1 mm. long, early naked, choco- 
late-brown, ruptured epidermis evident; teliospores ellipsoid, 17-23 by 28-35 wu; wall chestnut- 
brown, 1.5-2 u thick, lighter and thicker above, 5—7 4, smooth; pedicel slightly tinted or color- 
less, once to twice length of spore, the diameter uniform. 
ON PoacEAE: 
Imperata brasiliensis Trin., Guatemala. 
TYPE LOcALITy: Guatemala City, Guatemala, on Imperata brasiliensis. 
DISTRIBUTION: Known only from the type locality. 
11. Dicaeoma versicolor (Dietel & Holway) Arth. Résult. Sci. 
Congr. Bot. Vienne 344. 1906. 
Puccinia versicolor Dietel & Holway; Holway, Bot. Gaz. 24: 28. 1897. 
O and I. Pyenia and aecia unknown. 
II. Uredinia hypophyllous, oval or oblong, about 0.5 mm. long, orange-yellow, ruptured 
epidermis apparent; urediniospores obovoid, 23-26 by 32-38 4; wall colorless, irregularly 
thickened, 3~5 y, giving the contents a stellate appearance, sparsely and strongly echinulate, 
the pores obscure. 
Ill. Telia hypophyllous, numerous and crowded, oblong or linear, 0.5-2 mm. long, early 
naked, firm, pulvinate, blackish-brown, ruptured epidermis noticeable; teliospores flattened- 
globoid or ellipsoid, 23-32 by 35-42 y, rounded above and below, scarcely constricted at sep- 
tum; wall dark chestnut-brown, 3—4 yw thick, thicker above, 7-10 u; pedicel colorless, twice 
length of spore. 
On PosackaE: 
Heteropogon contortus (L,.) Beauv. (Andropogon contortus I,.), Jalisco, Puebla. 
Heteropogon melanocarpus (Ell.) Benth. (Andropogon melanocarpus Ell.), Jalisco, Morelos. 
TYPE LOCALITY: Guadalajara, Mexico, on Andropogon melanocarpus. 
DISTRIBUTION: Southern Mexico. 
ILLUSTRATIONS: Bull. Lab. Nat. Hist. Univ. Iowa 5: pl. 3, f. 40a—d. 
Exsiccati: Arth. & Holway, Ured. Exs. Ic. 40a—d; Barth. N. Am. Ured. 71. 
12. Dicaeoma purpureum (Cooke) Kuntze, Rev.’Gen. 33: 470. 
1898. 
Uredo Sorghi Pass. Comm. Soc. Critt. Ital. 2: 449. 1867. Not Dicaeoma Sorghi Kuntze, 1898. 
Uredo Sorghi Fuckel; Thiim. Bot. Zeit. 29:27. 1871. 
Puccinia purpurea Cooke, Grevillea 5:15. 1876. 
Puccinia sanguinea Dietel; Atk. Bull. Cornell Univ. 3:19. 1897, 
Uredo Sorghi-halepensis Pat. Bull. Soc. Myc. Fr. 19: 253. 1903. 
Uredo Andropogonis-hirti Maire, Bull. Soc. Myce. Fr. 21: 162. 1905. 
O and I. Pyecnia and aecia unknown. 
II. Uredinia amphigenous, somewhat gregarious on purple spots, elliptic, 0.5-1 mm. 
long, tardily naked, somewhat pulverulent, chestnut-brown, ruptured epidermis conspicuous; 
paraphyses clavate or capitate, curved, up to 65 u long, the wall cinnamon-brown, usually 
with a purple cast, 2-3 thick, 5~7 » at apex, smooth; urediniospores ellipsoid or oblong, 
often angular, 23-31 by 29-404; wall 1.5-2.5 » thick, cinnamon- or dark chestnut-brown, 
finely and rather closely verrucose-echinulate, the pores 5-10, scattered, usually 6-8 in two 
transverse bands variously located. 
