Davis—Notes on Parasitic Fungi in Wisconsin — VI. 709 
6:28) hold in Wisconsin. The collection on this host is more 
of the G. chenopodii type. 
Cercospora absinthir (Pk.) Saec. On Artetinisia Absinthium. 
Casco. 
Doassansia sagittariae (West.) Fisch. On Sagittaria arifolia 
Shiocton and Racine. 
Gymnoconia peckicma (Howe) Trotter. Caeoma on Rubus 
hispidus. - Necedah. 
Cronartium quercus (Brondeau) Schroet. Uredinia on Quer- 
cus bicolor and Q. ellipsoidalis. Necedah. Telia on Q. macro- 
carpa, Q. rubra and Q. ellipsoidalis. The latter is the most com¬ 
mon host of the telia in Wisconsin. 
Peridermium comptoniae (Arth.) Orton & Adams. On Pinus 
austriaca in the state nursery on Trout lake in Vilas county. 
ADDITIONAL SPECIES. 
Physoderma vagans Schroet. To this species I am provision¬ 
ally referring specimens on leaflets of Sium cicutaefolium col¬ 
lected in August, 1917 at Shiocton. The galls are round to el¬ 
liptical, prominent, 1-2 mm. long; the resting spores 1-8 in 
each cell, globose to elliptical, 18-21 x 14-18/* with walls about 
3/* thick. The host cells become inflated and rounded (up to 
70 x 50/*) the walls thin, fuscous and having a chitinoid appear¬ 
ance. 
Plasmopara cephalqphora n. sp. Conidiophores hypophyl- 
lous, effused, stout, straight, often clavate, 150-270 x 6-14/*, sim¬ 
ple to the apex which is divided into a few short (6-15/*) stout 
branches which are irregularly divided into the ultimate branch- 
lets which are terete, straight, truncate sometimes swollen at the 
apex; conidia hyaline, elliptical to oblong-fusoid, more or less 
acute at each end, flattened on one side, stipitate, furnished with 
an apical papilla, 45-70 x 20-33/*. On leaves of Physostegia 
pwrviflora. Shiocton, Plover and Dexterville, August, 1917. The 
conidia are imbricated in a compact head, bending of the pedicel 
(about 3/* long) allowing adjustment of position under pressure. 
The flattening of the conidia is perhaps the result of crowding; 
at least it facilitates close packing. 
