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/* 26 x 20/* 



26 x 18 22 x 19 



30 x 21 22 x 18 



29 x 17 26 x 22 



26x16 25x22 



34 x 24 22 x 18 



26 x 22 24 x 18 



29 x 20 22 x 19 



30 x 25 26 x 19 

 29 x 18 



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 Peronpsporales. 



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//. : ascospores 55-100 x Sy^-Ap. 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 V. B. Stewart with 

 the ascigerous fungus Laestadia aescidi Pk. (Phytopath. 

 4:399.) 



