1914] BURLINGAME—ARAUCARIA BRASILIENSIS 507 
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EXPLANATION OF PLATES XXV-XXVII 
Fic. 1.—Longitudinal section of a young cone in which the rudiments of 
the ovule are just becoming visible; 12 
Fic. 2.—Longitudinal section of a stghtly older sporophyll, showing the 
beginnings of the oe integument, and ligule; X15. 
Fic. 3.—Longitudinal section through the meristem of the nucellus; X62. 
Fic. 4.—Longitudinal section of an ovule just before fertilization, showing 
the position and relative size of the gametophyte and a acta nucellus; 
Frc. 5.—Megaspore mother cell in synapsis; 900. 
Fic. 6.—Longitudinal section through an ovule in the latter part of June, 
showing the enlarging megaspore; 20 
Fic. 7.—A megaspore just before diesen: surrounded by spongy tissue; 
X62. 
Fic. 8.—A binucleate embryo sac in late June; 62. 
Fic. 9.—An 8-nucleate sac in July; 62 
Fic. 10.—A 64-nucleate stage in late Fol: X62. 
Fic. 11.—A 512-nucleate stage in late August; 
Fic. 12.—A small portion of the parietal prea and nuclei in late 
October; X 125. 
Fic. 13.—A whole embryo sac in October; X 20. 
Fic. 14.—An embryo sac in November; X 20. 
Fic. 15.—An embryo sac in December; - 20. 
Fic. 16.—An embryo sac in January; 
Fic. 17.—The beginning of centripetal ok of the cytoplasm; X 20. 
Fic. 18.—The micropylar end of the gametophyte shown in fig. 17; X 125. 
Fic. 19.—Centripetal growth half complete; note that some of the nuclei 
are how —— outward and that there are no indications of walls; X20. 
20.—A detail of the same gametophyte as shown in preceding figure; 
Fic. 21.—The completion of centripetal growth of the cytoplasm; X62. 
