Volume LXVII Number 6 



THE 



Botanical Gazette 



Editor: JOHN M. COULTER 



JUNE 1919 



Structure, Development, and Distribution of So-called Rims or Bars of 



Sanio --------- Irving W. Bailey 449 



(With Plates XUI-XV) 



Apospory in Pteris sulcata L. ------ W. N. Steil 469 



(With Plates XVI, XVII, and four figures) 



Hydrogen Cyanide Fumigation. Contributions from the Hull Botanical 



Laboratory 249 E. E. Clayton 483 



(With two figures) 



Studies of Some Porto Rican Fungi - - - - Leo R. Tehon 501 



(With Plate XVra) 



Current Literature 



Book Reviews ----------- 5^2 



The living cycads 



Notes for Students ---------- 513 



The University of Chicago Press 



CHICAGO, ILLINOIS, U.S.A. 



THE CAMBRIDGE UNIVERSITY PRESS, London and Edinburgh 



THE MARUZEN-KABUSHIKI-KAISHA. Tokyo. Osaka. Kyoto. Fukuoka, Sendai 



THE MISSION BOOK COMPANY, Shanghai 



