vl CONTENTS [VOLUME 
LXV 
PAGE 
Notes on some southern California plants - - = - 0: B. Partsh 334 
Effects of rest and no-rest periods upon growth of 
ee ee es ee eS W.F. Gericke 344 
Further results in desiccation and “balan of 
Echinocactus (with one figure) - - - - Esmond R. Long 354 
Mass mutations and twin hybrids of Oenothera dates 
flora Ait. (with six figures) - - - Hugo De Vries 377 
Notes on North American trees. I. Quercus -— - C. S. Sargent 423 
Uredinales of the Andes, based on collections by Dr. 
and Mrs. Rose - ies Tee hie ae J.C. Arthur 460 
Aecial stage of Puccinia oxalidis - - - - W.H. Long and 
R. M. Harsch 475 
Successions of vegetation in Boulder Park, Colorado. 
Contributions from the Hull Botanical Labora- 
tory 238 (with fourteen figures) - - W.W. Robbins 493 
Quantitative measurements of permeability - Walter Stiles and 
. Jorgensen 526 
The zoocecidia of northeastern United States and 
eastern Canada. Contributions from the Hull 
Botanical Laboratory 239 - - - - B.W. Wells 535 
Direct assimilation of organic carbon ee Ceratodon 
purpureus (with five figures)  - - Wm. J. Robbins 543 
Systematic relationship of Clithris (with plate IX) - Leo R. Tehon 552 
Structure of wood in nahin dp and ee a 
plates X, XT) - - - = = Esther M. Flint 556 
BRIEFER ARTICLES— 
Charles Horton Peck (with two portraits) - - - Geo. F. Atkinson 103 
A new poisonous mushroom (with three figures) - T. Ichimura 109 
Regeneration of Bryophyllum calycinum (with two 
gures) i Oe a ee E. Lucy Braun 191 
_ Mistletoe vs. mistletoe (with one figure) - - - J.G. Brown 1093 
Growth of treesinsphagnum - - - - - - George B. Rigg 359 
Prothallia of Lycopodium in America - - - - E. A. Spessard 362 
Purple bud sport on pale flowered lilac tee 
persica) (with one figure) -  - - Frieda nie and 
H. H. Bartlett 
