Davis—Notes on Parasitic Fungi in Wisconsin — IV. 681 
ADDITIONAL SPECIES 
Not hitherto recorded as occurring in Wisconsin. 
Synchytrium cellulare n. sp. 
Galls of summer sporangia 130-240/x wide x 110-150^ high, 
consisting of a central cell surrounded on the sides bj smaller 
(30-40/i) thin walled, superhemispherical cells which form 
an investment about two cells thick; central cell often 
divided by a horizontal septum into an empty basal cell 
and a larger upper cell which contains the summer sporangia; 
sporangia 30 or more, yellow, spherical to elliptical, 18-26 x 15- 
22/l; resting spores globose to\ elliptical, brown, 50-90 x 40-80/x, 
single in simple galls but little larger than the spores, and of¬ 
ten at the base of the summer galls. Amphigenous on the 
leaves and on the petioles of Boehmeria cylindrica. This has 
been found only at the bottom of a kettle hole in the glacial 
drift at Devils Lake. It was first observed in 1913 on the few 
plants at the bottom of the kettle hole. In 1914 the quantity 
was less and in 1915 but a single infected leaf was seen which 
was not disturbed, but in 1916 no trace of the organism was 
found and careful search has not revealed it elsewhere. This 
recalls the career of Doassansia ranunculina Davis which was 
first collected in the early 90’s. It increased in abundance and 
range year by year until it could be found wherever the host oc¬ 
curred in any direction within a radius of five miles or more 
from, | the city of Kacine. In about ten years it suddenly dis¬ 
appeared and has not been seen since nor has it ever been re¬ 
ported from any other locality. I suspect that its extermina¬ 
tion was due to freezing weather in late spring that killed the 
infected leaves. 
Aphanomyces phycophila D By. 
On Spirogyra spp. indet. Madison (E. M. Gilbert). 
What is probably Sphaeria solidaginis Schw. has been col¬ 
lected on Solidago altissima at Petersburg and Gays Mills. The 
character of this production was discussed by Farlow in the 
Bibliographical Index, 270-1. 
Phyllachora Wittrockii (Erikss.) Sacc. was collected in an 
immature condition on Linnaea borealis americana at Solon 
