Davis—Notes on Parasitic Fungi in Wisconsin — VII. 403 
Additional Hosts 
Synckytrium aureum Schroet. 
On Geum strictum. Two Rivers. The material is not mature, 
but the parasite is doubtless the one that has been referred to this 
species 
Peronospora parasitica (Pers.) Fr. 
On Lepidium apetalum. Coloma and Hancock. Op Arabis 
hirsuta. Fish Creek and Madison. Working mostly with Europ¬ 
ean material, Gaeumann has divided the mildews on Cruciferae 
into upwards of fifty subspecies based primarily on physiological 
characters but using morphological characters also. (Beih . Dot. 
Central. 35: 395 et seq.). Field observation in Wisconsin indi¬ 
cates specialization on the various hosts. 
Microsphaera alni (Wallr.) Wint. 
To this species I have referred specimens on Baptisia bracteata 
collected at Arcadia. The measurements of the asci are 36-51 x 
30-36/x, of the spores 12-18 x 9/*. 
Frysiphe cichoracearum DC. 
On Artemisia serrata. Arcadia. 
Phyllachora on Sporobolus cryptandrus has been collected at 
Trempealeau by L. S. Cheney. The asci measured were 65-80 x 
10-13/a, the spores 10-12 x 6-7/a. 
Examination of a collection on Thalictrum dioicum made near 
Jacksonport, July 25, 1918, leads me to surmise that it is a micro- 
conidial state of Ascochyta clematidina Thuem. var. thalictri 
Davis with the pycnidia mostly imperfectly developed and that 
Gloeosporium thalictri Davis (Trans. Wis. Acad. 16: 760) is of the 
same character. A collection on Thalictrum dasycarpum made at 
Bruce August 30, 1918, is of the Ascochyta clematidina type hav¬ 
ing sporules 12-23 x 3-6/a. The material is probably immature, 
as the sporules appear continuous, the bilocular condition show¬ 
ing only when stained. This supports the suggestion made in 
“Notes” Y (p. 698) as to the relationship of the forms on Actaea, 
Clematis, and Thalictrum. The group is of the same character 
as the forms referred to on succeeding pages of “Notes” Y. 
Ascochyta lophanthi var. lycopina Davis. 
On Lycopus virginicus. Bruce. Sporules 20-28 x 7-10/a, the 
longer ones sometimes 2-3 septate. 
