262 



species. The resemblance here indicated led to the sowing of 

 telial material supplied by Mr, Archer upon Chenopodium album, 

 aecial host for both U. Peckianus and P. siihnitens. Sowings 

 were made on April 15, from both the November and February 

 collections, but without result. The species is in many ways 

 quite unlike Puccinia Chloridis Speg., which occurs in the 

 northern part of New Mexico, and elsewhere, the latter having 

 colorless urediniospores with apical thickening. 



All the material and observations for this species were supplied 

 by Mr. W. A. Archer, a freshman student of the New Mexico 

 Agricultural College, now in his sophomore year, who accom- 

 panied the authors on a trip to the Organ mountains in March, 

 1 914, and has since done effective ser\dce in making known the 

 rust flora of southern New Mexico. The specific name is given 

 in recognition of Mr. Archer's scientific acumen. 



Puccinia dolosa sp. nov. 



II. Uredinia amphigenous, evenly distributed, small, early 

 naked, cinnamon-brown; paraphyses none; urediniospores angu- 

 larly globoid to obovoid, 16-21 by 19-24 ^u; wall golden- or 

 cinnamon-brown, 1-1.5 Mj echinulate, the pores 3, equatorial. 



III. Telia amphigenous, small, tardily naked, dark chestnut- 

 brown; teliospores broadly ellipsoid, often irregular, 19—26 by 

 30-42 /x, rounded at both ends, slightly constricted at septum; 

 wall smooth, cinnamon- or chestnut-brown, i— 1.5 m, slightly 

 thickened at apex, 3-4 m! pedicel fragile, short, slightly tinted 

 or colorless. 



On Paspalum tenellum Willd., Guadalajara, Mex., Sept. 25, 

 1903, E. W. D. Holway (Sydow, Ured. 1986), City of Mexico, 

 Mex., Oct. II, 1898, E. W. D. Holway jo6^; on P. paniculatum L., 

 Cuernavaca, Mex., Sept. 28, 1899, E. W. D. Holway 3514, 

 Sept. lo-ii, 1910, A. S. Hitchcock. The first named collection 

 is taken as the type. The species has heretofore been included 

 with Puccinia suhstriata, from which it differs in the smaller 

 uredinia, and urediniospores. The urediniospores are also 

 paler, thinner-walled, and with the pores uniformly three so far 

 as observed. It appears to be a species confined to central Mexi- 

 co, while P. suhstriata is a semitropical species extending around 

 the world. 



