352 NORTH AMERICAN FLORA [VoLUME 7 
ellipsoid, 16-23 by 23-32 4; wall light cinnamon-brown, about 1.5 « thick, moderately and 
finely echinulate, the pores 2, superequatorial. 
III. Telia’ hypophyllous, scattered, oval, oblong or linear, 0.3-1.5 mm. long, sometimes 
crowded and confluent end to end, rather early naked, without stroma, blackish, pulvinate, 
ruptured epidermis conspicuous; teliospores clavate or cylindric, 15-22 by 39-51, slightly 
constricted at septum, rounded, obtuse or often acuminate at apex; wall chestnut-brown, 
1.5-2 » thick, much thicker above, 7-9 , smooth; mesospores rather common; pedicel tinted, 
concolorous, about as long as spore. 
This species agrees closely with Nigredo Rynchosporae (Ellis) Arth., except in possessing two- 
celled teliospores, and in having urediniospores that are somewhat more variable in size and generally 
slightly larger and thicker-walled. The two forms should eventually be united under one name. 
ON CYPERACEAE: 
Rynchospora aurea Vahl, Porto Rico. 
Honchasrere corniculata (Lam.) A. Gray (R. macrostachya Torr.), Alabama, Louisiana, 
exas. : ' 
Rynchospora corymbosa (L,.) Britton, Porto Rico. 
Rynchospora cyperoides (Sw.) Mart., Bahamas; Porto Rico. 
Tyrer Locatity: Auburn, Alabama, on Rynchospora corniculata. 
Distrisution: Locally from central Alabama to Texas and the West Indies. 
120. Dicaeoma consobrinum (Arth. & Holway) Arthur. 
Puccinia consobrina Arth. & Holway; Arth. Mycologia 10: 129. 1918. 
O and I. Pyenia and aecia unknown. 
II. Uredinia hypophyllous, scattered, oblong, 0.2-0.4 mm. long, soon naked, cinnamon- 
brown, ruptured epidermis noticeable; urediniospores globoid or ellipsoid, 16-23 by 21-26 ; 
wall cinnamon-brown, 1.5-2.5 », moderately echinulate, the pores 2, equatorial. 
III. Telia hypophyllous, scattered, ellipsoid, small, 0.1-0.2 mm. long, soon naked, chest- 
nut-brown, ruptured epidermis inconspicuous; teliospores ellipsoid or oblong, 19-23 by 32- 
39 uw, rounded at base and apex, somewhat constricted at septum; wall smooth, chestnut- 
brown, 2~3 » thick, thicker at apex, about 7 u, with lighter umbo; pedicel colorless, once to 
twice length of spore. 
ON CYPERACEAE: 
Rynchospora corymbosa (L.) Britton, Jamaica. 
Rynchospora polyphylla Vahl, Costa Rica; Jamaica. 
Typx LocaLIty: San Ramén, Costa Rica, on Rynchospora polyphylle. 
DISTRIBUTION: West Indies and Central America, a local species. 
121. Dicaeoma Caricis-polystachyae (Dietel) Arthur & Kern.* 
Puccinia Caricis-polystachyae Dietel, Ann. Myc. 4: 306. 1906. 
Puccinia Kellermanii Kern, Mycologia 9: 210. 1917. 
O and I. Pyenia and aecia unknown. 
Il. Uredinia chiefly hypophyllous, scattered, oval or oblong, 0.4-0.7 mm. long, rather soon 
naked, pulverulent, pale cinnamon-brown, ruptured epidermis noticeable; urediniospores 
ellipsoid or obovoid, 18-26 by 25-32 u; wall light golden-brown, about 1.5 » thick, moderately 
and distinctly echinulate, the pores 2, or sometimes 3 or 4, equatorial. 
Ill. Telia chiefly hypophyllous, sometimes on the upper part of the culm or rachis, 
scattered, oval or oblong, 0.4-1 mm. long, early naked, chocolate-brown, ruptured epidermis 
noticeable; teliospores clavate-oblong, 16-21 by 30-45 4, rounded or sometimes narrowed 
above, usually narrowed below, slightly constricted at septum; wall golden- or chestnut- 
brown, 1-1.5 » thick, much thicker above, 5-10 4; pedicel tinted next to the spore, once to 
once and a half length of spore. 
ON CYPERACEAE: 
Carex madrensis L,. H. Bailey, Morelos. 
Carex polystachya Wahl. (C. cladostachya Wahl.), Guatemala; Oaxaca 
TypE LocALITY: Oaxaca, Mexico, on Carex polystachya. 
DISTRIBUTION: Southern Mexico and Guatemala. 
* Species of Dicaeoma on Carex in collaboration with Frank DuNN KERN. 
