PAPERS GIVING RUSTS OF NORTH AMERICA. 243 



*J9ii. 7. P. Aiulropogi, L.v.S., very frcciucnt in autumn uii 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 four or more stems 

 antl many leaves in pieces 7-10 cm. long, bearing an abmulance of 

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

 edly Andropogon scoparius IMichx.. and the rust still bears Schwei- 

 nitz's name, although generally wriltrn P. .hidropogonis. 



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

 ence in the method of formiiij; [\\c genitive of this and similar Latin- 

 ized Greek words, common among classical writers of the very early 

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

 adopted. 



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

 cialU- 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 botli ends. Spores very dark, 

 rather small ; immersed in water, brownish. 



Represented l)y an original packet containing five fragments of 

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

 of telia. The packet is labelled " Puccinia emaculata 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. capillarc, judging from the soft pubescence, and from the 

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

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

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

 nounce the host to be /'. capillarc. 



*29I3. 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 tiie epidermis, rather broad, applanate. Spores large, 

 blackish brown. 



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



