446 AtpEN: LIFE HISTORY OF UVULARIA SESSILIFOLIA 
1878; 8: 261-390. 1879; Compt. Rend. 88: 1359-1361. 1879; Bot. 
Zeit. 377: 505-509. 1879. 
The last reference is taken indirectly through Coulter and Chamberlain, Mor- 
phology of angiosperms. 
Explanation of plates 34, 35 
Uvularia sessilifolia 
All drawings have been made with the aid of a Bausch and Lomb microscope and 
camera lucida 
PLATE 34 
Fic. 1. Portion of cross section of anther of inner stamen of flower on August 8. 
(X 310.) H, hypodermal cell. D, hypodermal cell dividing into primary spo- 
rogenous and primary wall cell. Three hypodermal cells apparently give rise to 
archesporium. 
Fic Portion of cross section of anther of outer stamen of flower on August 8. 
(X 310.) D, derivatives of ae wall cell. P, primitive archesporium. Five 
hypodermal cells ‘gee tly divid 
IG. ne of cross section ee inner anther of flower on August 8. (X 70.) 
FIG. 4. tices of cross section of outer anther of flower on August 8. (% 79.) 
Fic. 5. Single hypodermal cell of anther on August 8. (X 720.) Note 
two nucleoli. 
Fic. 6. Portion of cross section of anther on September 21. 
(X 70.) W, wall 
cells, 3 layers. M, middle layer, disappearing. 7, tapetum. S, microspore mother 
cells 
(% 310) S, micro- 
Portion of cross section of anther, September 27. 
er cells. 
Fic. : 
spore mother cell. T, tapetum cells elongated, nuclei close to spore moth 
M, middle layer disorganized. , 
1G. 8. Cross section of pollen grain, April 25. (X 
nucleus. TJ, tube nucleus: note the prominent nucleolus and 
IG. 9. Outline of portion of cross section of ovary showing two nuce 
(X 70, material somewhat shrunken. 
0.) G, generative 
72 
poor reticulum. 
lli, Oct. 21- 
PLATE 35 
Fic. 10. Outline of portion of cross section of ovary showing two nucelli, 
(X 70, material somewhat shrunken 
Fic. 11. Outline of pee of cross section of ovary 
swelling at one side, Mar. : 
Fic. 12. Portion of Lag section of nucellus, showing enlarging hyPo 
dermal the Mar. 3. (X 310.) M, probable megaspore mother ce hte 
Fic. 13. Portion of longitudinal section of nucellus, showing me; 
cell enlarging, Mar. 14 3 
Fic. 14. Portion of longitudinal section of nucellus showing megas 
cell, April tac, CX Fro, 7 
Fic. 15. Portion ge longitudinal section of nucellus, showing nucleus a go 
spore mother cell in synapsis and origin of inner integument, Apel as 
Dec. 8. 
showing nucellus with slight 
gaspore mother 
pore mother 
