174 NATURAL HISTORY BULLETIN. 



35. Puccinia tripsaci Diet. & Holw. (1897. Bot. Gaz. 



24:27). 



35a. On Tripsacum dactyloides L. X, iii. Near City of Mexico, 

 Mex., Holw ay. 



Orig. Desc. "Sori on both sides of the leaves, at first covered by the 

 epidermis, at length erumpent, somewhat linear: uredosori cin- 

 namon-brown, spores globose or elliptical, 30-37 by 28-33//, epispore 

 up to 4/u, thick, chestnut-brown, echinulate, with four germ-pores: 

 teleutospores elliptic or obovate, rounded at both ends, with a 

 hooded thickening at apex, slightly constricted, smooth, brown, 

 33-41 by 20-25//: pedicel longer than spore, firm, brownish." 



SYN: 



1897. Uredo pallida D. & H. Bot. Gaz. 24:37. 



Sori amphigenous, but especially beneath, prominent, 

 somewhat linear, 1-3 mm. long, tardily naked, encircling 

 epidermis conspicuous. 



II. Uredosori pale, uredospores nearly round to obovate, 

 small, 13-18 by 20-26^, colorless when dry, wall thin, 

 echinulate, pores four, equatorial. 



X. Amphisori cinnamon-brown, amphispores round or 

 elliptical, wall thick up to 4/*, dark yellowish-brown, 

 coarsely echinulate, 28-33 by 30-37/"-, pores four, rather 

 noticeable, equatorial; pedicel thick, fugacious. 



III. Teleutosori dark brown, teleutospores elliptic or 

 obovate, slightly or not at all constricted, smooth, dark 

 golden-brown, 20-25 by 33-41/*, apex rounded, occasion- 

 ally obtuse, considerably thickened, base rounded, pedicel 

 as long or longer than the spore, colored, firm. 



The apportionment between this species and the follow- 

 ing one of the four or five forms of uredineous spores now 

 known on Tripsacum is based upon their association in the 

 material that has come to hand. The absolute proof of 

 relationship must await careful field observation or 



