AMERICAN UREDINE^E. 313 



and yet there is little reason for supposing there is more than 

 one species represented. 



46. Puccinia aristidicola Henn. (1896. Hedw. 35:243.) 



46a. On Aristida fasciculata Torr. {A. dispersa Triii. & Rupr.), III. 

 Torreon, Mex., Holway. 

 \<ab. On Aristida fasciculata Torr. III. Chapala, Mex., Holway. 



OriG. DESCR. " Soris foliicolis oblongis vel striiformibus, atris epiderrnide 

 rupta cinctis; uredosporis subglobosis vel late ellipsoideis, brunneis, 

 levibus, 24-30 X 22-25,", episporio 4.6// crasso, levi; teleutosporis inter- 

 mixtis late ellipsoideis, oblongis vel subclavatis, atrobrunneis vel casta- 

 neis, utrinque rotundatis apice incrassatis, medio leniter constrictis, 

 28-40 X 18-28/i, episporio atrocastaneo, levi, 4-6/z crasso, pedicello 

 usque ad 120/i longo, 6-8/i crasso, subhyalino apice brunneolo." 



II. Uredospores globose or broadly elliptical, 22-30 by 

 26-32/4, wall pale-yellow, thick, 4/* or more, finely verrucose, 

 pores 4, equatorial. 



III. Teleutosori epiphyllous, between the veins, oblong to 

 elongated linear, prominent, very dark-brown; teleutospores 

 oblong or elliptical, rounded at both ends, 22-30 by 30-40//, 

 slightly or not constricted at the septum, side walls thick, up 

 to 6fi, apex somewhat thicker, pedicel thick, firm, slightly 

 tinted, long, once to thrice the length of the spore. 



The type of this species was collected in Argentine in 

 1881, upon an undetermined Aristida. It appears to differ 

 materially from Puc. aristida Tracy, coming from Africa. 

 One of the numbers of this distribution has been mistaken 

 for Puc. subnitcns Diet. (Bot. Gaz. 24: 28), a species having 

 a close resemblance in both gross and microscopic appear- 

 ance. The uredospores, however, show marked differences, 

 especially in the number and arrangement of the germ-pores. 



A collection upon Aristida gracilis Ell., made in Nebraska 

 by Rev. J. M. Bates agrees well with the two numbers of 

 this distribution, except that both uredo and teleutospores are 

 smaller and thinner walled, in which respects it seems to be 

 intermediate between this species and P. aristidce. 



