Davis—Notes on Parasitic Fungi in Wisconsin — XI. 295 
the forma confiuens that occurs on Sagittaria heterophylla. Evi¬ 
dently the smut does not recognize Lophotocarpus as being gener- 
ically distinct from Sagittaria. 
Sclerotium (f) glohuliferum Davis. On Glyceria grandis. 
Chetek. 
Additional Species 
In 1921 Plasmopara cuhensis (B. & C.) Humphrey was collected 
in gardens at Madison on Cucumis sativa^ CucurMta maxima and 
Cucurhita pepo in September. 
Peronospora myosotidis DBy. A very scanty collection on upper 
leaves of Myosotis laxa in July at Arena is supposed to be of this 
species but the material was not sufficient for proper examination. 
Pleospliaerulina hriosmna Pollacci. On Medicago sativa (cult.) 
Madison. (P. R. Jones) 
Phyllosticta oakesiae Dearn. & House. On Oakesia sessilifolia. 
White Lake. In Notes” VIII, p. 418 a collection of this was re¬ 
ferred to Phyllosticta cruenta (Fr.) Kickx. As this occurs in Wis¬ 
consin the development is usually imperfect and I suspect it of 
being a state of Diplodia uvulariae Davis. 
Phyllosticta ludwigiae Pk. On Ludvigia polycarpa. Blue River. 
In this collection the spots are usually elongate and the pycnidia 
prominent and often defective. 
Phyllosticta verhenicola Martin. On Verbena stricta. Blue 
River. I have not seen an authentic specimen of this species and 
Dr. Seaver informs me that there is none in the Ellis herbarium. 
In this collection the spots are mostly somewhat larger than the 
description indicates and somewhat cinereous in color, the sporules 
6—8x2—3/X. 
Phyllosticta. ambrosiae n. sp. 
Spots brown, suborbicular, immarginate, 3-12 mm. in diameter, 
mottled with small white arid areas on which the usually solitary 
pycnidia are located; pycnidia epiphyllous, dark brown, ostiolate, 
globose and about lOO^i in diameter to oval and 150ju. long; sporules 
hyaline, bacilliform, 3-6xlft. On Ambrosia trifida. Days Mills, 
Wisconsin, July 30, 1921. 
