66 
IOWA ACADEMY OP SCIENCE 
Not uncommon on various aecia, appearing as large or small purpulish 
tubercles. 
152. PusAEiuM PARAsiTicuM Ellis & Kell. 
On Puccinia MentJiae Pers., on Monardo fistuloso L. 
Rather abundant, especially just previous to the appearance of the telia. 
153. PusAEiuM UREDiNEUM Ellis & Everh. 
On MeJampsora Bigelowii Thum., on Salix lucida Muhl., and M. Medusae 
'Thum., on Popiilus deltoides Marsh. 
Rather common on the uredinia of these two species, giving the sori the ap- 
pearance of being covered with a white mould. 
CLASS BASIDIOMYCETES. 
ORDER USTILAGINLES 
Family Ustilaginaceae. 
154. UsTiLAGo Hordei (Pers.) Kell. & Swing. [U. segetum p. p.] 
On Hordeum vulgare L. 
Abundant and destructive. 
155. USTiLAGo neglecta Niessl. [Z7. Panici-glauci Wint.] 
On Setaria glauca (L.) Beauv. (Chaetochloa Scribn.) 
Rather abundant. 
156. USTILAGO Rabenhoestiana Kuehn. 
On Digitaria sanguinalis (L.) Scop. (Syntherisma Dulac.) 
Abundant in autumn. 
157. USTILAGO UTEICULOSA (NgGS) Tul. 
On Polygo7ium la.pathifoUum L., and P. pennsylvanieum L. 
Rather common in late summer and autumn. 
158. Melanopsighum austeo-americanum (Speg.) G. Beck. (Ustilago Speg.) 
On Polygonum lapatliy folium L. 
Rare, only three or four small sori being found in early autumn. 
159. ScirizoNELLA melanogramma (DC.)'* Schroeter. 
On Carex pennsylvanica L. 
Abundant in spring and early summer. 
160. SoROSPORiuM Cenchri P. Henn. [Ustilago Syntlierismae Peck., not 
Schwein., S. Syntherismae Parlow.] 
On Cenchrus trihuloides L. 
Abundant in autumn. The specific name Syntherismae is based on a mis- 
interpretation of specific limits which is analogous to a misdetermination in so 
far as the nomenclatural status of the combination is concerned. It has ac- 
cordingly been thought preferable to use the name here employed. 
Family Tilletiaceae. 
