CONTENTS 
Lioyvp, Francis E. Leaf water and stomatal movement in ic 
and a method of direct visual observation of stomata in situ. - 
GorTNER, Ross AIKEN, and Harris, J. ARTHUR. On a possible lation: 
ship between the structural peculiarities of normal and ils 
fruits of Passiflora heer and some et aa -chemical pipers 
their expressed juices - 27 
RYDBERG, PER AXEL. Studiés on ‘ie Rucky Mountain flora-XXVII - - 43 
SMITH, Mae MorGAN. Tetradesmus, a new four-celled coenobic alga 
(plate 1) Oe eee 
EvANs, Agee W. See iioomus. Henn toe ys Development of 
the peristome in Ceratodon purpur - 
ButTLer, O. A note on he significance of sugar in alees of ae 
tuberosum (plate 2) - 110 
PENNELL, FRANcIS W. Studies in the Agalinanae, a Sah of she 
Rhinanthaceae - - 119 
LEVINE, MICHAEL. Studies i in ‘thie cytology of ihe Hymenomyoetes, espe- 
cially the Boleti (plates 4-8 ~ 457 
SLossON, MARGARET. New ferns from oneal hawace 1 (plat — - 183 
pregerie WINIFRED J. A taxonomic cape of the rheahanesr of the 
Hawaiian Islands—III (plates 9-12 193 
PICKETT, F. L. The development of he embry0- “sac of Asiilens tri- 
phyllum (plates 13 and 1 
RicG, Georce B. Is rnd a iste: in cite distributios of Nereocystis 
Luetkeana? - - 237 
BRAINERD, Ezra. Four hybrids of Viola ‘Dedatilidg (plates 15-17) - - 249 
BICKNELL, EUGENE P. Viola obliqua Hill and other violets - 261 
Knupson, L. Observations on the inception, season, and soatok of 
cambium development in the American larch sake: sonra = a 
Koch] (plates 18 and 19) - 71 
GLEASON, HENRY ALLAN. Sede a on ie West fallin erates sith 
one new species from Mexico - - 305 
Hoyt, W. D. Some toxic and antitoxic effects i in Sateen col Gamnaves - 333 
KUNKEL, OTTo, The production of a pheas iohees xs the aecidiospores of 
Caeoma nitens Burrill - See - 361 
Strout, A. B. A case of ‘at onsen in i accion (lati a - - 367 
HARPER, Rotanp M. A botanical cross-section of northern Mississippi 
ith notes on the influence of soil on vegetation (plates 21, 22) - 77 
PENNELL, Francis W. Studies in the A aoioenens a subtribe of the 
thaceae - 401 
ANDREWS, FRANK ial ‘ua ee ae Maia: Seine aicitioge 
concerning 
the reactions of the leaf hairs of Salvinia natans_~ - - 441 
Harris, J. ARTHUR. On.-the relationship between the number of ovules 
formed 
and the capacity of the ovary for maturing its ovules into seeds 447 
iii 
