40 



18 journal of Mycology [Vol.10 



A rather careful study of the newly detected species appears 

 to show that it is to be distinguished from P. Andropogonis 

 Schw. by the very dissimilar aecidium, and by the pores of the 

 uredospores, which number 5 to 8 and are distributed without 

 order, while in P. Andropogonis they usually number 3, and are 

 approximately equatorial. The name for the species should be 

 Puccini a pustulata (Curt.) nom. nov. 



7. Aecidium Ranunculi Schw. An exceedingly fortunate 

 observation was made in May, within a few miles of Lafayette, 

 Ind. On a somewhat shaded hillside, an area not exceeding ten 

 feet long by three feet wide, attracted attention by the yellowness 

 of the new vegetation. Looking closer, it was found that the 

 growing mass was made up almost wholly of Ranunculus ctbor- 

 tivuS L. thickly covered with the Aecidium Ranunculi Schw., 

 and an equal quantity of Eatonia Pennsylvanica (DC.) A. Cray, 

 intermixed, not yet in flower, but every leaf covered with a light 

 yelldw ured'O. No other rusts occurred for some distance around, 

 and even none on the same hosts elsewhere in the locality. 



Healthy plants of Eatonia Pennsylvanica were obtained from 

 another locality, transferred to the greenhouse, and spores of 

 Aecidium Ranunculi sown on the youngest leaves, May 13. From 

 this sowing uredospores appeared on May 21, and characteristic 

 teleutospores began to show June 3. Although the trial with 

 teleutospores could not be made, yet the' demonstration of the 

 genetic relation of the two forms seems beyond question. A 

 confirmatory observation upon the intimate association of the 

 two forms in the field has been reported to me by Mr. E. W. D. 

 Hoi way, from Decorah, Towa. 



Tin's is one of the numerous grass rusts passing under the 

 name of Puccinia rubigo-vera. It can not be called P. Ranunculi, 

 as that name is preoccupied, and therefore, I propose the name 



Puccinia Eatoniae nom. nov. (Aecidium Ranunculi Schw.) 



0. Sperinogonia hypophyllous, thickly scattered over large areas. 

 preceding or among the aecidia, punctiform, honey-yellow, inconspicuous, 

 subepidermal. 



1. Aecidia hypophyllous, evenly scattered over large areas; peridia 

 broad and short, recurved, finely lacerate: aecidiospores subglobose or 

 elliptical, 15-22 by 18-25/*; wall colorless, medium thick, 1.5-2// f mi- 

 nutely verrucose ; mycelium perennial in the host. 



II. Uredosori chiefly epiphyllous, on yellow spots, small, oblong, 

 pale yellow, ruptured epidermis noticeable; uredospores obovate-glob- 

 oid, 15-18 by 20-23 // ; wall thin when mature, about 1 //, pale yellow, 

 finely and evenly' echinulate, pores 6-8, scattered. 



III. Teleutosori chiefly hypophyllous and caulicolous, small, ob- 

 long to linear, covered by the epidermis; teleutospores oblong-clavate to 

 linear-cuneate, 12-16 by 35-45 //, truncate or rounded above, narrowed 

 below, slightly or not constricted at the septum ; wall smooth, light brown, 

 thin, 1-1.5 ft, apex a litte darker and thicker, 3-4//; pedicel very short, 

 colored ; paraphyses none, or few. 



