218 NORTH AMERICAN FLORA [V01.UME 7 



broadly oblong, 13-20 by 18-28 /x, rounded or obtuse at both ends, slightly or not constricted 

 at the septum; wall nearly or quite colorless, smooth, uniformly thin, 0.5-0.8^*; pedicel 

 colorless, thick, very short. 



On Oxalidaceae : 



lonoxalis divaricata Small, Mexico (state). 



lonoxalis latifolia (H.B.K.) Rose {Oralis laiifolia H.B.K.). Mexico. 



lonoxalis Mar Hana (Zucc), Small {Ox alls Mar liana Zucc), Jamaica. 



lonoxalis letraneuris Small, Mexico (state). 



lonoxalis Irinervis Small, Mexico (state). 



lonoxahs vallicola Rose, Mexico (state). 



lonoxalis violacea (L.) Small, {Oxalis violacea L.), New Mexico, Texas. 



lonoxalis (?) sp. {Oxalis ^■^.'), Veracruz. 



Type locality: Mexico, on Oxalis^-^. [probably O. lalifolia']. 



Distribution : Texas and New Mexico southward through Mexico and the West Indies ; also 

 in South America. 



Kxsiccati : Ellis & Ev, N. Am. Fungi 2716. 



3. Argomyces Vernoniae Arthur, sp. nov. 



O. Pycnia epiphyllous, gregarious, few in small groups 0.5-1 mm. across, punctiform, 



dark reddish-brown, globoid, 80-115// in diameter; ostiolar filaments rather short, about 

 55 // long. 



II. Uredinia hypophyllous, solitary or often surrounded by the telia, not usually abun- 

 dant, roundish, about 0.5 mm. across, bright cinnamon-brown, ruptured epidermis evident ; 

 urediniospores flattened-globoid or globoid, 24-29 m broad by 23-26 /^ long ; wall pale-yellow, 

 1.5-2 /i thick, moderately and prominently echinulate, the pores indistinct, apparently 4, 

 equatorial. 



III. Telia hypophyllous, usually in irregular groups 1,5-2 mm. across, roundish, 

 0.2-0.3 mm. across, pulvinate, light chestnut-brown, or cinereous by germination, ruptured 

 epidermis not conspicuous; teliospores narrowly ellipsoid or fusiform, 16-24 by 55-70/i, 

 narrowed above and below, usually considerably constricted at the septum ; wall cinnamon- 

 brown, uniformly thin, about 1//, smooth ; pedicel fragile, colorless, one half to once length 

 of spore. 



On Carduaceae : 



Vernonia borinquensis Urban, Porto Rico. 



Vernonia sp., St. Croix. 

 Type collected at Cayey, Porto Rico, on Vernonia borinquensis , January, 1911, E. W. D. 

 Holm ay 3. 



Distribution : West Indies. 



4. Argomyces Baccharidis-multiflorae (Dietel & Holway) Arthur. 



Puccinia Baccharidis-mullijiorae Dietel & Holway; Holway, Bot. Gaz. 31 : 331. 1901. 

 Eriosporangium Baccharidis-mullijiorae Arth. Result. Sci. Congr. Bot. Vienne 343. 1906. 



O. Pycnia epiphyllous, few in a group, punctiform, inconspicuous, in section flattened- 

 globoid, 100-112 /i broad by 70-90 m high ; ostiolar filaments 29-32 11 long. 



II. Uredinia at first epiphyllous surrounding the pycnia, soon hypophyllous, round, 

 0.2-0.5 mm. across, early naked, pulverulent, bright cinnamon-brown, ruptured epidermis 

 evident ; urediniospores obovate, 21-29 by 30-39 m, rounded or obtuse above, usually nar- 

 rowed below; wall golden-brown, concolorous, moderately thin, 1-2 ju, greatly thickened 

 above, 3-7 ju, strongly and sparsely echinulate with points about 3/li apart, the pores 3, 

 prominent, equatorial, usually covered by the hyaline lens-shaped cuticle. 



III. Telia hypophyllous, abundant, scattered, round, earlynaked, 0.3-0.7 mm. across, 

 pulvinate, light chestnut-brown, or cinereous by germination, ruptured epidermis incon- 

 spicuous ; teliospores broadly oblong, or oblong-obovate, 21-27 by 40-50 p, rounded or 

 obtuse at both ends, slightly constricted at the septum ; wall smooth, cinnamon-brown, often 

 paler at the apex, thin, 1-1.5 m, greatly thickened above, 5-12 ju, also greatly thickened 

 { 3-7 ju) over the pore of the lower cell close to the septum ; pedicel nearly or quite colorless, 

 terete, slender, S-T fi thick, one half to once and a half length of spore. 



On Carduaceae : 



Baccharis elegans H.B.K. , Oaxaca. 



Baccharis midiifiora H.B.K., Mexico (state). 

 Type locality : Amecameca, Mexico, on Baccharis muliiflora. 

 Distribution : Central and southeastern Mexico, 



