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 
Puccinia 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 abor- 
tivus L. thickly covered with the Aecidium Ranunculi Schw., 
and an equal quantity of Eatonia Pennsyhanica (DC.) A. Gray, 
intermixed, not yet In flower, but every leaf covered with a light 
yellow uredo. No other rusts occurred for some distance around, 
and even none on the same hosts elsewhere in the locality. 
Healthy plants of Eatonia Pennsyhanica 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. 
Holway, from Decorah, Iowa. 
This 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.) 
O. Spermogonia hypophyllous, thickly scattered over large areas, 
preceding or among the aecidia, punctiform, honey-yellow, inconspicuous, 
subepidermal. 
I. 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// t m j_ 
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 u, apex a litte darker and thicker, 3-4/*; pedicel very short* 
colored; paraphyses none, or few. 
