254 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



nis. Rist's Canon, Col., (121). This is not usually common, but was 

 found abundantly in one place on the above host. 



Plasmopara Geram't (Pk.) Berl. On leaves of Geranium sp.. Rapid 

 Creek Park, Wyo., (156). This is also a somewhat rare fungus, and 

 although this species of geranium is extremely abundant in the parks 

 it was only after a diligent search that a few fungus-affected leaves 

 were found. 



Plasmopara Kellermanii (Ellis & Halstead) Swingle. On leaves of 

 Iva Xanthiifolia, McCook, Neb. ,(122); Sheridan, Wyo. ,(123); Omaha, 

 Neb., (140). Was quite abundant in a few localities. 



Peronospora Corydalis De Bary. On foliage of Argemone platyceras, 

 Golden, Col., (124). This fungus was less abundant at this point than 

 at other localities. The fungus has also been collected in Western 

 Iowa. 



Peronospora effusa (Grev.) Rabenh. On leaves of Chenopodium al- 

 bum, Larimer County, Col., (139); Fort Collins, Col., (147); Crete, 

 Neb., (134). This was not common at any of the points. 



Peronospora myosotidis De Bary. On foliage of Myosostis sylvatica 

 var. alpcstris, Bosworth's Ranch, Larimer County, Col., (143). Quite 

 a number of plants were found in a few places. The plants were weak 

 and spindling. 



PERISPORACE^.. 



PodosphcBra OxyacanthcR (DC.) De Bary. On leaves of Prunus Vir- 

 giniana, Manitou Trail, Col., (in); N. Cheyenne Canon, Col., (112). 

 This was not abundant either at N. Cheyenne Canon or along the 

 Manitou Trail. 



SpcErotheca castagnei Lev. On leaves and stems of Gilia sp., above 

 Big Horn, Sheridan County, W)o., (107). This was extremely com- 

 mon on plants in damp places along the roadside. 



MicrosphcBra Symphoricarpi Howe. On leaves of Symphoricarpos 

 occidentalis . (no). 



Erysiphe graminis DC. On leaves of Poa flava, above Big Horn, 

 Wyo., (109); Poa Wolfii, Golden, Col., (108). This was very abund- 

 ant at Big Horn. Generally this fungus is not found fruiting, but 

 these specimens showed well-developed perithecia. At Golden it was 

 extremely abundant on grass growing in damp Douglas Sijruce woods 

 — in fact, there was scarcely a plant that was not affected. 



