122 Twenty-fifth Report on the State Museum. 



the older authors, Trichobasis Huhigo-vera Lev. In this con- 

 dition it is the " rust " of the grain fields. 



Yariety hrevioarpa has the sori smaller, the spores obovate or 

 elliptical, generally obtuse, .OOll'-.OOlS' long, and the peduncle 

 thick. It occurs especially on Panicwn capillare^ and may be P. 

 emamilata Schw. I have received it labeled "P. striola," but it 

 certainly runs into the present species. It occurs oftener on the 

 leaves than on the sheaths, but the ordinary form is most abun- 

 dant on the sheaths, sometimes rendering whole internodes black. 



37. P. AEUNDiNACEA Iledw. Reed Brand. 



Amphigenous ; sori subrotund or oblong, sometimes confluent, 

 prominent, blackish -brown ; spores oblong, obtuse or apiculate, 

 strongly constricted, septate in the middle, .0016'-.0023' long, 

 .0007'-.0008' broad ; peduncle subhyaline, two to four times as 

 long as the spore. 



Leaves of Phragmites comonunis. Montezuma marshes. Sep- 

 tember. 



I have seen no American specimens witJi apiculate spores. This 

 is P. Arundinarice Schw. 



38. P. STEioLA Lh. Sedge Brand. 



Ilypogenous; spots pallid or none; sori oblong or linear, some- 

 times crowded, prominent, surrounded or partly covered by the 

 ruptured remains of the epidermis, blackish-brown or black ; spores 

 oblong or oblong-clavate, slightly constricted, obtuse, .0016'-.002' 

 long, .0006-.0007' broad; peduncle slightly colored, one-half to 

 wholly as long as the spore. 



Leaves of various sedges. Autumn. Not rare. 



In all my American specimens the spores are more clavate than 

 in the European and scarcely to be distinguished from those of the 

 next species. The spore figured was taken from authenticated 

 European specimens. 



39. P. Cariois DC. Carex Brand. 



Hypogenous ; sori subrotund, prominent, scattered, sometimes 

 crowded, blackish-brown or black ; spores oblong-clavate, slightly 

 constricted, .0013'-.0018' long, .0006' broad ; peduncle subhyaline, 

 one-half to wholly as long as the spore. 



Leaves and sheaths of Carices. Autumn. Common. 



This species scarcely differs from the preceding, to which some 

 authors unite it, except in the character of the sori and the slightly 

 smaller spores. It is doubtful if it is more than a mere variety. 

 The upper cell of the spore is subglobose. The Uredo form is 

 Trichobasis caricina Lev. 



