AMERICAN UREDIXE.E. 



3^5 



Orig. Desc. '-2912. S. P. khaculata, L. v. S., passim in foliis Panico- 

 rum, praesertim Panici pubescentis in campis Bethl. et Philad. P. om- 

 nino emaculata; primum acervis totis tectis rarioribus sparsi> erumpen- 

 tibus; demum saepe confluentibus, minutis, abbreviates, angustis. par- 

 allelis, utrinque plerumque acuminatis. Sporidiis aterrimis, minori- 

 bus; aquae immersis, fu>cescentibus."' 



SYN : 

 Puccinia graminis brczicarpa Peck. (1873. 2 5th Rep. X. 

 Y. Mus. p. 122.) 



II and III. Sori chiefly epiphvllous but also amphigenous, 

 usually numerous, small, oblong, pulverulent, early naked, 

 ruptured epidermis prominent. Uredospores light brown. 

 globose or nearly so, 20-24 u in diameter, epispore rather thin, 

 thickly echinulate, pores 4, not usually equatorial. Teleuto- 

 spores oblong-clavate to elliptical, chestnut-brown, smooth, 

 scarcely constricted at middle, apex obtuse or rounded, much 

 thickened, base narrowed 18-22x20-45 . pedicel one to one 

 and a half times the length of the spore and colored like it. 



A very abundant species. As here characterized it does not 

 include Puccinia windsoricR on Tricuspis seslerioides, or P. 

 triodim on Tricuspid purpurea. It appears to extend through- 

 out the North American continent. The specimens examined 

 from Mexico (on Panicum Jiolciformc) show a rich develop- 

 ment of uredo, but only a few teleutospores and no teleutu- 

 sori. 



The uredospores are discharged from the sori so plentifully 

 as to form a brown powder over the surface of the leaf. The 

 blackish teleutosori are thickly scattered over the leaf surfaces, 

 and become especially conspicuous on the bleached leaves in 

 winter. 



EXSIC. 

 Ellis, N. A. F. 1029. 

 Carleton, Ured.Amer. 37. 

 Kellerman and Swingle. Kans. Fungi 15. 

 Seymour and Earle, Econ. Fungi 58a, 58b, 5SC, 59. 

 Ellis and Everhart, Fungi Colunib. 492. 

 Rabenhorst-Winter. Fungi Europaii 3616. 



24. Puccinia cryptandri E. & B. (1897. Erythea 5: 47. ) 



