144 ARTHUR: NEW SPECIES OF UREDINEAE 
tured epidermis conspicuous; urediniospores broadly ellipsoid or 
- obovoid, 18-21 by 26-29 y; wall pale yellow or quite colorless, 
1-1.5 uw thick, closely and rather inconspicuously echinulate, the 
pores 6-8, scattered. 
Ill. Telia amphigenous, scattered, oblong to linear, 0.2-3 
mm. in length, compact, dark gray, long covered by the epidermis, 
surrounded by a thin dark-brown stroma; teliospores oblong or 
clavate, 15-21 by 50-60, truncate or somewhat rounded above, 
narrowed below, slightly or not constricted at septum; wall cinna- 
mon-brown, darker above, thin, I-1.5 uw, not or slightly thickened 
above, 2—5 u, smooth; pedicel very short, tinted. 
On Scirpus americanus Pers., Arcola, Wyoming, August 23, 
1916, E. Bartholomew 6089. A subepidermal form of Scirpus 
rust abundantly distinct from all others. 
Puccinia Rosenii sp. nov. 
Oand I. Pycnia and aecia unknown. 
II. Uredinia hypophyllous, scattered or in series, oval or 
linear, 0.5-2 mm. long, rather tardily naked, ruptured epidermis 
conspicuous; urediniospores 30-35 u long, when seen with pores in ~ 
optical section oblong, 10-20 » wide, when seen with pores central 
globoid or broadly ellipsoid, 28-35 » wide; wall cinnamon-brown, 
1.5-2.5 » thick, moderately echinulate, the pores 2, superequatorial. 
Ill. Telia few, disposed like the uredinia, tardily naked, 
chocolate-brown; teliospores clavate, or elongated oblong, 16-23 
by 43-67 p, rounded or truncate above, usually narrowed below, 
slightly constricted at septum; wall chestnut-brown above, some- 
what lighter below, 1-24 thick, 5-10» above, smooth; pedicel 
colorless, nearly as long as spore. 
On Schoenus nigricans L. (?), Daytona, Florida, December 27, 
1915, R. A. Harper 5. This rust, found in scanty amount on a 
somewhat uncertain host without inflorescence, is apparently 
nearest like P. Eriophori Thiim. This species is named for H. R. 
Rosen, who has made the careful study of this material on which 
the diagnosis and conclusions are founded. 
Puccinia Heliconiae (Diet.) comb. nov. 
Uredo Heliconiae Diet. Hedwigia 36: 35. 1897. 
The uredinial stage of this rust was described from a collection 
made at Rio de Janeiro, Brazil, in December, 1891, on an unde- 
