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VOLUME XLVIII NUMBER 4 
BOTANICAL GAZETTE 
OCTOBER 1909 
THE EMBRYO SAC OF HABENARIA* 
Wittram H. BROWN 
(WITH TWELVE FIGURES) 
The present investigation was made on Habenaria ciliaris (Michx.) 
R. Br, and H. integra (Nutt.) Spreng. The development of the two 
species is very much alike and the same description will apply to both. 
The material was fixed in medium chromacetic and the sections were 
Firs = Se Megaspore mother cell in apex of llus.—Fic. 2. Megaspores.—Fis. 3. 
division of functional megaspore and three degenerating megaspores. 
cut 10 thick and stained with Flemming’s triple or Haidenhain’s 
Iron alum hematoxylin. 
T The ovule of Habenaria is anatropous and has two integuments. 
h he archesporium differentiates in the apex of the nucellus as a single 
ypodermal cell ( fig. 1), which is the terminal cell of a row surrounded 
No “Contribution from the Botanical Laboratory of the Johns Hopkins > scbieganted 
- Io, 
24 
