1918] PFEIFFER—THISMIA 363 
Fic. 10.—Four-nucleate embryo sac; non-functional megaspores disor- 
Fic. 11.—Eight-nucleate embryo sac. 
Fic. 12.—Embryo sac at maturity; chalazal walls conspicuously gela- 
Fic. 13.—Embryo. 
Fic. 14.—Young anther, showing 2 of 4 microsporangia. 
Fic. 15.—Microsporangium with mother cells in synapsis, longitudinal 
section. 
Fic. 16.—Microsporangium, showing large number of sterile pollen grains, 
tapetum disorganizing. 
Fic. 17.—Portion of stamen tube, showing glandular cells of inner surface 
(nearest style). 
