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1909] PACE—GAMETOPHYTES OF CALOPOGON 137 
Fic. 30.—Two mother cells after recovery from synapsis. 
Fic. 31.—Two mother cells with several cells of nucellar tissue between; 
ovule cut across. 
Fic. 32.—Ovule with two daughter cells; and probably another mother cell 
r it, or another daughter cell with slight traces of the second disintegrating. 
— —Eight megaspores from two mother cells. 
—Two-celled embryo sac, three disintegrating megaspore nuclei, and 
a sede cal recovered from synapsis. 
G. 35.—One mother cell in ee the other already divided, giving two 
ee nuclei without separating wa 
PLATE IX 
Fic. 36.—Diagram of anther, showing four pollen masses; massulae shaded. 
Fic. 37.—Pollen mother cells in synapsis. 
Frc. 38.—Pollen mother cell with spindle. 
Fic. 39.—Pollen mother cell in telophase. 
Fic. 40.—Telophase of second division. + 
Fics. 41, 42.—Pollen tetrad; microspore nuclei. : 
IG. 43.—Two tetrads, each pollen grain of which shows tube and generative 
nucleus. 
Fic. 44.—Pollen tube from within ovary. 
Fic. 45.—Pollen tube near ovule. 
Fic. 46.—Two-celled embryo sac. 
Fic. 47.—Both nuclei in sac in mitos 
Fic. 48.—Four-celled embryo sa ae disintegrating megaspores 
Fic. 49.—Four-celled sac; traces a spindle of preceding division; megaspore 
nucleus within sac disintegrating. 
Fic. 50.—Four-celled sac; prophase for next division; traces of disintegrating 
megaspore nucleus and micropylar daughter ce 
Fic. 51.—Eight-celled sac; traces of spiniding of preceding division. 
Fic. 52.—Nuclei beginning to assume usual position in sac. 
Fic. 53.—Sac ready for fertilization; egg apparatus of egg and two synergids; 
two polars, one a sister to the egg; three antipodals; pollen tube between 
integuments. 
Fic. 54.—Pollen tube within the sac; egg and two polars in late < = 
metaphase. 
Fic. 55.—Pollen tube in sac; egg with thick spirem; polars with chromosomes. 
Fic. 56.—Double fertilization. 
