Ig15} HUILCHINSON—MALE GAMETOPHYTE OF PICEA 299 
18. Lopriore, G., Uber die Vielkornigkeit der Pollenkérner von Araucaria 
Bidwillit. Ber Deutsch. Bot. Gesells. 23: 235-246. 1905. 
19. THompson, R. B., Preliminary note on the Araucarineae. Science N.S. 
22:88. 1905 
20 
De sintiwe: L. L., The staminate cone and pane gametophyte of 
Podocarpus. Bot. Gas. 46:161-178. 1908. 
EXPLANATION OF PLATES XV-XIX 
The drawings (figs. 1-53) have been made with the aid of the Abbé camera 
lucida. The original magnification was 2000. A reduction of one-half has 
been made in reproduction. 
Fics. 1-13.—The first primary division; the primary cell retains its iden- 
tity; the first primary wall cuts off an antheridial cell. 
Fic. 1.—Primary cell. 
Fic. 2.—A division at right angles to the longitudinal axis. 
Fic. 3.—A division in the plane of the axis; a chromatic extrusion is be- 
ing formed and is separating from the nuclear chromosomes. 
_ Fics. 4, 5.—Telophases: the primary nucleus and spindle fibers sepa- 
Fics. 6, 7, 8, 11.—Telophases: each shows the cell plate in one of 4 
positions; in fig. 8 both nuclei have escaped from the spindle fibers. 
Fics. 9, 12.—Two free nuclei in common cytoplasm; compare fig. 8. 
Fics. 10, 13.—The primary cell has given rise to two daughter cells, each 
of which may function as a sister primary ed 
Fics. 14-27.—The second primary divi 
Fic. 14.—The primary eg in contact ik ‘s first evanescent antheridial. 
Fics. 15, 16.—Prophase. 
Fic. 17.—Anaphase: spine fibers indistinct. 
Fics. 18-25.—Telophases: illustrate migration of primary nucleus and 
spindle fibers; fig. 24, a view from upper pole; figs. 23-25, the formation of 
the ag all. 
Fics. 26, 27.—Pollen grains with oe cell and two non-functioning 
antheridial cells; compare size with 
Fic. 28.—First antheridial (““prothallial”) cell in division. 
29.—Primary cell; also first and second antheridial cells; the former 
has vies to form two nuclei 
IG. 30.—First pathcettnt cell has divided to form a spermatogenous and 
Sterile cell. 
Fics. 31, 32.—Two sister primary cells (cf. figs. 11 and 13) have given 
rise to a banter gametophyte (disintegration). 
Fic —Four free nuclei, products of first antheridial cell; the primary 
cell and a antheridial cell disintegrating. 
Fics. 34~36.—Chromatic extrusions. 
