310 NORTH AMERICAN FLORA [VoLuME 7 
Ill. Telia amphigenous, scattered, seldom confluent, broadly elliptic, small, 0.3-0.5 mm. 
long, early naked, dark chocolate-brown, pulvinate, ruptured epidermis inconspicuous; telio- 
spores globoid or broadly ellipsoid, 21-25 by 26-32 u, both ends rounded, not constricted at 
septum, the septum sometimes oblique or vertical; wall dark chestnut-brown, 2-2.5 pw thick, 
slightly thickened at apex, 3-7 »; pedicel light golden- or pale cinnamon-brown, two or three 
times length of spore, sometimes attached laterally or at an angle. 
On Posckak: 
Muhlenbergia ciliata (H.B.K.) Kunth, Jalisco, Oaxaca; Guatemala. 
Muhlenber gia implicata (H.B.K.) Kunth, Mexico (state). 
Muhlenbergia quitensis (H.B.K.) Hitche., Guatemala. 
Muhlenbergia tenella (H.B.K.) Trin.. Jalisco; Costa Rica 
Muhlenbergia sp., Nicaragua. 
Pereilema crinitum Presl, Jalisco, Morelos. 
TyPE Locality: Nicaragua, on Muhlenbergia sp. 
DISTRIBUTION: From south-central Mexico through Central America. 
ILLUSTRATIONS: Bull. Lab. Nat. Hist. Univ. Iowa 5: 316, f. 1; pl. 2, f, 49a, 6. 
ExsiccaTi: Arth. & Holway, Ured. Exs. Ic. 49a, b. 
51. Dicaeoma (?) Triniochloae (Arth. & Holway) Arthur & Fromme. 
Uredo Triniochloae Arth. & Holway, Am. Jour. Bot. 5: 538. 1918. 
Oand I. Pycnia and aecia unknown. 
II. Uredinia chiefly epiphyllous, numerous, small, elliptic, 0.2-0.5 mm long, soon naked, 
yellowish, pulverulent, ruptured epidermis inconspicuous; paraphyses numerous, erect, clavate 
or capitate, unusually large, 10-29 by 58-98 u, the wall yellowish, of uniform thickness, 1-2 p, 
or slightly thicker above; urediniospores ellipsoid or obovoid, 16-19 by 19-264; wall thin, 
about 1 », yellowish or pale cinnamon-brown, finely and closely echinulate, the pores obscure, 
about 4-6, scattered, sometimes appearing equatorial. 
III. Telia unknown. 
On POACEAE: 
Triniochloa stipoides (H.B.K.) Hitche. (Muhlenbergia stipoides Kunth, Avena stipoides 
Scribn.), Guatemala. 
TYPE LOCALITY: San Rafael, Department of Guatemala, Guatemala, on Triniochloa stipoides. 
DISTRIBUTION: Known only from the type locality. 
52. Dicaeoma amphigenum (Dietel) Kuntze, Rev. Gen. 3%: 467. 
1898. 
Puccinia amphigena Dietel, Hedwigia 34: 291. 1895. 
O. Pyenia amphigenous, numerous, in irregular groups or somewhat diffused, minute, 
punctiform, pale-yellow, becoming dark-brown, immersed, globose in vertical section, 80-100 u 
in diameter; ostiolar filaments 50-65 yu high. 
I. Aecia hypophyllous, in somewhat crowded groups 5-10 mm. in diameter, on discolored 
spots, cupulate, small, 0.3-0.4 mm. broad; peridium short, yellowish, slightly recurved; peri- 
dial cells oblong, 16-23 by 23-29 yu, overlapping and strongly imbricate, the outer wall smooth, 
5~—7 » thick, transversely striate, the inner wall 3 » thick, evenly verrucose; aeciospores glo- 
boid or oblong, 16-23 by 19-26 uy; wall pale-yellow, 1.5 » thick, finely and evenly verrucose. 
On LILIAcEAE: 
Leucocrinum montanum Nutt., Colorado. 
ON SMILACEAE: 
Smilax herbacea L., Kansas, North Dakota; Manitoba. 
Smilax hispida Muhl., Illinois, Kansas, Nebraska. 
II. Uredinia amphigenous, few, scattered, narrowly oblong, 0.5-2 mm. long, early naked, 
cinnamon-brown, pulverulent, ruptured epidermis conspicuous; urediniospores globoid or 
broadly ellipsoid, 18-23 by 21-26 yu; wall cinnamon-brown, 1.5—2 » thick, finely and closely 
echinulate, the pores about 8, scattered. 
III. Telia amphigenous, numerous, crowded and often confluent, oblong or oblong- 
linear, 0.5-3 mm. long, early naked, blackish-brown, ruptured epidermis conspicuous; telio- 
spores oblong or oblong-clavate, 18-32 by 30-56 yw, rounded or less often truncate or attenuate 
above, usually narrowed below, only slightly constricted at septum; wall dark chestnut-brown, 
1-1.5 » thick, 7~10 » at apex; pedicel golden- or pale cinnamon-brown, once length of spore 
or less. 
