VI 



CONTENTS 



[volume Lxvn 



PAGE 



Basis of succulence in plants 



D. T. MacDougal, 

 H. M. Richards, and H. A. Spoehr 405 



A coniferous sand dune in Cape Breton Island (with 

 eight figures) ------- 



Embryo sac and embryo of Pentstemon secundiflorus. 

 Contributions from the Hull Botanical Labora- 

 tory 248 (with plate XII) ----- 



Structure, development, and distribution of so-called 

 bars or rims of Sanio (with plates XIII-XV) 



Apospory in Pteris sulcata L. (with plates XVI, 

 XVII, and four figures) - - - - - 



Hydrogen cyanide fumigation. Contributions from 

 the Hull Botanical Laboratory 249 (with two 

 figures) -------- 



Studies of some Porto Rican fungi (with plate 

 XVIII) -------- 



Briefer Articles — 



Byron D. Halsted (with portrait) - - - - 

 Hybrid perennial sunflowers - - - - - 

 Relationships within the Rhodosporeae - - - 

 George Francis Atkinson (with portrait) - 

 Depressed segments of oak stems (with four figures) 

 Importance of epidermal coverings (with two figures) 



LeRoy H. Harvey 417 



Arthur T. Evans 427 



/. W. Bailey 449 



W. N. Steil 469 



E. E. Clayton 483 



H. H. Whetzel 366 

 /. W. Bailey 438 

 R. B. Harvey 441 



Current Literature 



93, 171, 268, 369, 445, 512 



For titles of book reviews see index under author's 

 name and reviews 



Papers noticed in "Notes for Students" are in- 

 dexed under author's name and subjects 



DATES OF PUBLICATION 



No. I, January 18; No. 2, February 15; No. 3, March 18; No. 4, April 18; 

 No. s, May 19; No. 6, June 21. 



