VOLUME XXXVI NUMBER I 
DO LANICAL @( AZEiaG 
JULY, 1903 
ON THE GAMETOPHYTES AND EMBRYO OF 
TAXODIUM. 
CONTRIBUTIONS FROM THE BOTANICAL LABORATORY OF THE 
JOHNS HOPKINS UNIVERSITY, No. 1. 
W. C. COKER. 
(WITH PLATES I—X!) 
In spite of the recent great increase in our knowledge of 
spermatogenesis in many groups of gymnosperms, this part of 
the life history of the Taxodieae remained, at the time this work 
was undertaken, almost unknown. A short contribution by 
Shaw (’97) on Sequoia had appeared in 1897, and Arnoldi 
(’99”>) has recently added two papers on the development of 
the reproductive organs in Sequoia. These observers have 
cleared up many salient points in the development of this genus, 
but the group as a whole is still to be studied. 
Taxodium itself, probably on account of its limited geograph- 
ical distribution, has been greatly neglected by investigators. 
Coulter on the histology of the leaf, Masters on the seedling, 
Lotsy and Meehan on the knees, and Von Schrenk on the dis- 
ease called ‘‘peckiness’’ are among the few papers that have 
been devoted, in whole or in part, to the study of Taxodium, 
and none is concerned with the development of the seed. 
The present work was suggested by Dr. D. S. Johnson, to 
whom I wish to express my gratitude for his unfailing kindness 
and helpful advice throughout its prosecution. I also wish 
‘A dissertation submitted to the Board of University Studies of the Johns Hop- 
__ kins University, June 1901, for the degree of Doctor of Philosophy. 
: I 
