(Schw.) to which the conidial stage had previousWbeen 

 referred. Last year's account made no mention of the 

 mildew, w^hose conidia is found occasionally on the 

 peach. Specimens of this have since been collected. To 

 what species is this form referable ? Fruiting specimens 

 are greatly desired. 



The two following have been added to the list. 

 Alicrosphaera Euphorbiiie (Peck) B.&C. on Euphorbia 

 corollata, Columbus, W. C. Werner and E. M. Wilcox. 

 Microsphaera Russselii (Clinton) on Oxalis, Columbus, 

 by W. A. Kellerman and E. M. Wilcox. 



Contributions of specimens of Ohio Erysipheai are 

 earnestly solicited. 



*G. Coadero Compt Kendu XVI, 1893. 



A Comparative Histological Study of Stems of 

 Ohio Species of Nymph.ea, Castalia and Nelum- 

 BiuM. By E. Mead Wilcox, Columdus. 



The histological differences are well marked both in 

 the libro-vascular bundles and in the parenchymous 

 tissue. The Nclumbo stem have exterior lignified cells, 

 which are very thick walled ; in the other two genera 

 no such tissue is found. Differences were noted also in 

 the internal stellate hairs and abundance of starch 

 grains. Several plates accompanied the paper. 



Notes on Drying Botanical Specimens. By W. A. 

 Kellerman, Columbus, 



To determine the extent of shrinkage of leaves in 

 different kinds of plant presses, the length and width 

 of a number of leaves were accurateh' determined both 

 before and after they were pressed. A board press 

 with no weight except the boards themselves — 2V^ 

 pounds, a board press with 40-pound weight and a 

 slat and cord press were used. The percentage of 



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