256 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



Exvascus nanus (Johanson) Sacc. On leaves, twigs and branches of 

 Betula occidejitalis, Happy Hollow, Larimer County, Col., (118). One 

 tree was found very much affected, a number of branches showing well- 

 marked Witches' Brooms. 



SPH^ROPSn)E^. 



Septoria acerina Pk. On the leaves of Acer glabriwi, Pike's Peak, 

 Col., (128). 



Septoria expansa Niessl. On leaves of Geranium sp., Beaver Creek, 

 Col., (212). 



Septoria Jainesii n. sp. Pammel & Hume. Spots small, yellow, 

 orbicular, becoming confluent and at length involving the whole leaf 

 which becomes uniformly straw-colored ; perethecia scattered, black, 

 sub-globose; sporules hyaline, straight, cylindrical, 28-32x2.5-3/". 

 On leaves oi Stellaria Jamesii, Golden, Col., (201). 



Septoria lepidiicola Ell. & Mart. On leaves of Lepidium apetalum, 

 Grand Island, Neb., (203). 



Septoria lupulina Ellis & Kell. On leaves o{ Humulus lupulus, Lin- 

 coln, Neb., (153)- Collected by F. R. Clements. 



Septoria Pentstenionis Ell. & Kell. On leaves of Pentstemon sp. , 

 Beaver Creek, Col., (210). 



Septoria Siscyii Pk. On leaves of Echinocystis lobata, Fort Collins, 

 Col., (141). 



Septoria Ribis Desm. On Ribes auremn Golden, Col., (204). 



MUCEDNIACE^. 



Microstroma atnericanormn Pammel & Hume, n. sp. Spots large, 

 pale, later brown, circular, becoming irregular ; conidiophores hyaline, 

 fasciculate, hyphophyllus, upper part somewhat irregular, 39-47.5 X3M; 

 conidia hyaline, ovate-oblong, usually two nucleated, epispore thin, 

 9-11x6-9^. On leaves of Cnicus americanus, haiTimer County, Col., 

 (209). 



Ramularia arnicalis Ell. & Ev. On foliage of Arnica cordifolia, 

 Larimer County, Col., (130); Arnica sp. , Larimer County, Col., (208). 



Ramularia Psoralece Ell. & Ev. On leaves of Psoralea argophylla, 

 McCook, Neb., (202). 



