Volume 41 November-December, 1941 Number 6 



TORREYA 



A Bi-MoNTHLY Journal of Botanical Notes and News' 



EDITED FOR 



THE TORREY BOTANICAL CLUB 



BY 



WILLIAM J. BONISTEEL 



CONTENTS 



Gametophytes of Equisetum Arvense L Edwin B. Matzke 181 



Distribution in Ontario of Dracocephalum thymiflorum Herbert Groh 187 



Linnaeus' Rules of Nomemclature H. W. Rickett 188 



An Unstable Dicentra P- J- van Melle 191 



An Introduced Ladysthumb from Asia Harold N. Moldenke 192 



Book Reviews 



Amos Eaton John Hendley Barnhart 199 



Laboratory Guide in Elementary Bacteriology Wm. J. Bonisteel 200 



Field Trips of the Club 201 



Proceedings of the Club 206 



Comments and News Notes 211 



Dates of Publication of Torreya in 1941 212 



Index to Torreya, Volume 41 213 



Published for the Club 



By the Free Press Printing Company 

 1S7 College Street, Burlington, Vermont 



Entered as second class matter at the post office at Burlington, Vermont, 

 October 14, 1939, under the Act of March 3, 1879 



