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IOWA ACADEMY OP SCIENCE 
171. Melampsoea Lini (Sclium.) Desmaz. 
On Linum sulcatum Riddell. 
A single collection in the later part of June. Scarce. 
172. Melaaipsoea Medusae Thum [M. populina Jacq.] 
On Populus deltoides Marsh. 
Abundant on the Carolina poplar throughout the summer and autumn, but 
not noted on any other species of Populus. h. 
173. Petcciniasteum Ageimoniae (Schw.) Tranz. {Uredo Agrimoniae DC.) 
On Agrimonia gryposepala Wallr. (A. hirsuta Bicknell), and A. mollis (T. 
& G.) Britton. 
Not a common rust. Late summer and autumn. 
174. PucciNiASTEUM Pyeolae (Pers.) Dietel. 
On Pyrola elliptica Nutt. 
The uredinia collected sparingly late in May. 
175. Hyalopsoea Polypodii (DC) Magnus [Uredo Polypodii DC.] 
On Cystopteris fragilis (L.) Bernh. (Pilix Underw.) 
Rather abundant in a single locality in the middle of July. 
176. Melampsoeopsis Pyeolae (DC.) Arth [Clirysomyxa pirolatum' (Schw.) 
Wint.] 
On Pyrola elliptica Nutt. 
Rather abundant in May. 
177. Ceoxaetium Comandeae Peck. 
On Comcindra pallida A. DC. 
A small clump of the host found infected in early October. 
Family Puccimaceae. 
178. PiLEOLAETA Toxicodendei (Berk. & Rav.) Arthur. [Uromyces Toxico- 
dendri Berk & Rav.] 
II, III on Rhus Toxicodendron L. {R. radicans L.) 
Not an uncommon rust, but the inconspicuous telia render it easily over- 
looked. 
179. Teanzschelia punctata (Pers.) Arth. [Aecidium punctatum Pers., 
A. hepaticum Schw., A. Ranunculacearum DC. Puccinia prunosum Link, P. 
pruni-spinosae Pers.] 
I on Anemone quinquefolia L., and Hepaticq acutilo'ba DC. (H. acuta Brit- 
ton.) 
II, III on Prunus americana Marsh. 
The aecial stage is one of the commonest and most abundant of our rusts. 
The later stages are usually abundant where found, but not so common as the 
aecia. The mycelium appears to be perennial in Anemone and Hepatiea so 
this stage can appear without indicating the probable abundance of the rust 
on the alternate hosts. 
