128 



Mycologia 



men in the Field Museum, Chicago, numbered 76850, appears to 

 be part of the original Tonduz collection, and from this specimen, 

 which shows well-developed telia, was taken the mycological 

 material on which this entry is based. 



46. Puccinia dochmia Berk & Curt, (on Poaceae) 



Muhlenbergia tenella (H.B.K.) Trim, Cartago, Dec. 14, 1915, 

 II, III, 256; San Jose, Dec. 27, 1915, ii, III, 304 ; same, Jan. 

 11, 1916, ii, III, 408. 

 This heteroecious rust, whose aecia are not known, was also 

 collected on the same host in the telial stage, at San Juan, by H. 

 Polakowsky, Dec. 1, 1875. 



47. Puccinia Cenchri Diet. & Holw. (on Poaceae) 



Cenchrus echinatus L., Orotina, Dec. 31, 191 5, II, 342. 



A heteroecious rust, common in the warmer parts of America, 

 whose aecia are unknown. 



48. Puccinia venustula (Arth.) comb. nov. (on Poaceae) 



Andropogon brevifolius Sw., Orotina, Dec. 29, 1915, II, III, 31J. 



Heretofore only one collection of this species has been known, 

 the type collection for Uredo venustula Arth., on the same host, 

 made by Prof. F. L. Stevens in Porto Rico (Mycol. 8: 21. 

 1 91 6). The present collection shows abundance of telia in addi- 

 tion to the uredinia. The telial stage may be thus characterized. 



Telia chiefly hypophyllous, scattered, oblong to linear, 0.2-1.0 

 mm. long, early naked, compact, blackish, ruptured epidermis 

 evident, teliospores clavate or ellipsoid, 19-23 by 39-50 fx, rounded 

 at both ends, or narrowed below; wall chestnut-brown below, 

 chocolate-brown above, 2-3^, thickened above, 9-10 /x, smooth; 

 pedicel short, chestnut-brown. 



49. Puccinia purpurea Cooke (on Poaceae) 



Sorghum sp. (cultivated). 



A specimen of this rust was communicated by N. Patouillard, 

 collected by A. Tonduz at Guadalupe, October, 1908, showing 

 much parasitized uredinia. It is common and abundant on the 

 cultivated sorghums in the tropics of both hemispheres. 



