250 



Mycologia 



translucent spots above, followed on May 8 by aecia beneath. No 

 pycnia were formed, as sections and microscopic examination 

 fully proved. All American collections of aecia on Aquilegia in 

 the herbarium were found to have either no pycnia associated 

 with the groups of aecia, or more rarely only a few pycnia, a con- 

 dition not before noted in heteroecious rusts of grasses and 

 sedges. 



This rust is undoubtedly quite well distributed in the western 

 mountains, and embraces a large part of all aecia yet found in 

 America on Aquilegia. It is apparently distinct from Puccinia 

 Agrostidis Plowr., a European species with aecia on Aquilegia, 

 and is, therefore, described as new, although there is much mor- 

 phological similarity between the two. 



Puccinia obliterata sp. no v. 



0. Pycnia few, frequently obsolete, epiphyllous, gregarious, in- 

 conspicuous, honey-yellow, in vertical section globoid, 80-107/* in 

 diameter; ostiolar filaments 40-75//, long. 



1. Aecia chiefly hypophyllous, thickly crowded in groups 1-5 

 mm. across, on slightly larger discolored spots, rather short ; peri- 

 dium colorless, margin somewhat erose, cells rhomboidal in longi- 

 tudinal section, 16-24/* in length; aeciospores globoid, or often 

 somewhat angular, 15-19 by 18-25/*, wall colorless, thin, about I/*, 

 very minutely verrucose, appearing nearly smooth when wet. 



On Aquilegia caerulea James, Buffalo Pass, Park Range, Colo., 

 Aug. 13, 1898, C. L. Shear & E. A. Bessey (Ellis & Ev., Fungi 

 Columb. 1474) ; Trapper's Lake, Colo., Aug. 14, 1894, Prof. C. S. 

 Crandall 100; Beulah, N. Mex., June 29, 1909, Mrs. W. P. Cock- 

 er ell; North Vermilion Creek, Sweetwater Co., Wyo., July 17, 

 1897, A. Nelson; A. elegantula Greene, Ouray, Colo., July 12, 

 1907, F. E. & E. S. Clements (Crypt. Form. Colorad. 59^) ; A. 

 flavescens Wats., Banff, Alb., July 25, 1901, Laggan, Alb., July 

 21, 1907, E. W. D. Holway; A. formosa Fisch., Skamania Co., 

 Wash., Aug. 12, 1886, W. N. Suksdorf; A. truncata Fisch. & 

 Mey., Jackson Co., Oreg., July 9, 1903, E. B. Copeland (Sydow, 

 Ured. 1767). 



II. Uredinia chiefly hypophyllous, scattered, linear, small, soon 

 naked, pulverulent, cinnamon-brown, ruptured epidermis notice- 

 able; urediniospores globoid or broadly ellipsoid, 16-23 by 19- 

 29/*; wall light cinnamon-brown, medium thin, 1.5-2.5/*, finely 

 echinulate-verrucose, pores 6-8, scattered. 



III. Telia chiefly epiphyllous, scattered, often crowded and con- 



