IOWA ACADEMY OP SCIENCE 55 
48. Uncinula jvecator (Scliwein.) Burrill. 
On Psedera quinquefolia (L.) Greene (Parthenocissus Planch.), and Vitis 
vulpina L. 
Rather common. Reported by Fink on Yitis cordifoJa Michx. and an un- 
identified species of Vitis. 
Uncinula ciecinata Cooke & Peck. 
Reported by Pink on Acer sacoliarum Marsh. 
49. Uncinula maceospoea Peck. 
On *Ulmus americana L. 
Collected but once and then not over abundant. 
Uncinula Clintoni Peck. 
Reported by Pink on Tilia americana L. 
50. PiiYLLACTiNiA coEYLEA (Pers.) Karst. 
On Fraxinus americana L., and '^Cornus stalonifera Michx. (leg. Hunger- 
ford. XantUoxylum americanum (leg. Hungerford.) ^ 
While the collections of this species were rather scanty it appears to be 
rather a common species judging by Pink’s long list of additional hosts which 
follow: Acer saccharum Marsh., Betula papyrifera Marsh., Gornus florida L., 
Corylus americana L., Crataegus sp. indet., Fraxinus sp. indet., Desmodium 
grandiflore (Walt.) DC. (Meibomia grandiflora Kuntze), and TJlmus americana 
L. 
Family Perisporiaceae. 
51. Dimeeospoeium Collinsii (Schw.) Thumen. 
On Amelanchier canadensis (L.) Medic. 
The entire under surface of the leaves is covered with the black perithecia. 
The fungus appears to be quite injurious to its host as it causes a pronounced 
falling of the leaves in late summer and early autumn. That the mycelium is 
perenial is indicated by the changed appearance of the infected twigs which 
grow quite luxuriantly, are thicker and brighter colored than the healthy twigs, 
besides showing a decided tendency in favor of forming witches brooms. 
52. Dimeeospoeium pulcheum Sacc. 
On Gornus paniculata L’Her. 
Common in late summer. 
OEDEE HYPOCEEALES. 
Family Hypocreaceae. 
53. Hypomyces lactifluoeum (Schwein.) Tul. 
On some species of Agaricaceae, probably Lactaria. 
One collection of some half dozen infected plants was made in late summer. 
54. Hypomyces polypoeinus Peck. 
On Coriolus versicolor (L.) Quel. (Polystictus Pries.) 
Found once in some abundance in the early spring, probably of the previous 
year’s growth. According to Seaver* this species is known only from New 
*Mycologia 2:78. 1910. 
