PAPERS GIVING RUSTS OF NORTH AMERICA. 243 



*29li. 7. P. Andropogi, L.v.S., very frequent in autumn on leaves and 

 culms also sheaths of various species of Andropogon, Bethle- 

 hem. 

 P. spots obscure, sori densely aggregated, elevated, fuscous, obtuse, 

 linear, short. Spores fuscous. Although not confluent, yet 

 occupying almost the whole leaf. 



Represented by an original packet containing foin^ or more stems 

 and many leaves in pieces 7-10 cm. long, bearing an abundance of 

 telia, labelled " Puccinia in Andropogi LvS." The host is undoubt- 

 edly Andropogon scoparius Michx., and the rust still bears Schwei- 

 nitz's name, although generally written P. Andropogonis. 



The two methods of writing the specific name indicate a differ- 

 ence in the method of forming the genitive of this and similar Latin- 

 ized Greek w'ords, common among classical writers of the very early 

 as well as more modern times. The longer form is now generally 

 adopted. 



*2gi2. 8. P. emaculata, L.v.S., here and there on leaves of Panicum, espe- 

 cially Panicum pubescens in fields, Bethlehem and Philadelphia. 

 P. entirely without spots ; at first the sori are all covered, rather 

 few, sparse, erumpent; later often confluent, minute, short, nar- 

 row, parallel, mostly acuminate at both ends. Spores very dark, 

 rather small ; immersed in water, brownish. 



Represented by an original packet containing five fragnients of 

 grass leaves, 1-2 cm. wide by 2-10 cm. long, with a scanty showing 

 of telia. The packet is labelled " Puccinia cniaculata LvS in Pan- 

 ico pubes. Bart Gard." The leaves are somewhat pubescent and 

 considerably weathered. They can scarcely be the leaves of Pani- 

 cum pubescens Lam., but rather are those of the more widely dif- 

 fused P. capillare, judging from the soft pubescence, and from the 

 general association of the rust. A portion of the Schweinitz col- 

 lection has been seen by Prof. A. S. Hitchcock and by Mrs. Agnes 

 Chase, the eminent agrostologists of Washington, D. C, who pro- 

 nounce the host to be P. capillare. 



*2giT,. 9. P. Junci, L.v.S., on culms of J. effusus, Bethlehem, frequent. 



P. scarcely with any spots ; sori irregular, erumpent, somewhat cov- 

 ered by the epidermis, rather broad, applanate. Spores large, 

 blackish brown. 



Represented by an original packet, containing three pieces, 5-7 



