252 Wisconsin Academy of Sciences, Arts, and Letters. 
exceed the dimensions given for this species. I append meas¬ 
urements made from the conidia of two collections: 
May 13, 1914. 
May 25, 1914. 
31 x 22 fa 
26 x 20 ^ 
26 x 18 
22x19 
30x21 
22 x 18 
29x17 
26x22 
26x16 
25x22 
34x24 
22x18 
26x22 
24x18 
29x20 
22x19 
30 x 25 
26x19 
29x18 
These measurements indicate that the conidia were larger on 
the earlier date. The meteorological records show that May 
13th was a day of low temperature and low relative humidity 
(44°-62°. 39-25) while on May 25 the temperature ranged 
62°-84° and the humidity 99-66. I take it that to the low 
temperature may be credited the larger conidia on May 13th. 
This reminds one of Melhus’ finding that a comparatively low 
temperature favors germination of conidia of P eronpsporales. 
During one season, somewhere in the ’nineties, there appeared 
at one station in the suburbs of Racine a destructive outbreak of 
Erysiphe on Galium aparine. On examination from time to 
time no spores were found in the asci and no specimens were 
preserved for that reason as I did not know at that time that 
they were not formed during the season. The mildew was 
looked for during subsequent years but was not again seen. 
From an examination of specimens of Lophodermium pinastri 
(Schrad.) Chev. on Pinus Banksiana collected at Millston June 
5, 1914, the following measurements were made: asci 115-185 x 
22-30 fx: ascospores 55-100 x 314-4 /a. It has been distinguished 
on the label in the herbarium as var. amplum. The affected 
leaves were still in situ. 
Phyllosticta paviae Desm. is connected by Y. B. Stewart with 
the ascigerous fungus Laestadia aesculi Pk. (Phytopath. 
4:399.) 
