36 BOTANICAL GAZETTE [JANUARY 
22b. , The Podocarpeae. Ann. Botany 26:443-514. pls. 46-48. 1912. 
23. STRASBURGER, E., Die Angiospermen und Gymnospermen. Jena. 1870. 
24. THOMPSON, Rowen eae On the Pollen of Microcachrys tetragona. 
Bor. Gaz. 47:26-29. 1909. 
25a. TISON, A., Sur le Saga conspicua. Mém. Soc. Linn. Normandie 
23: 139-160. pls. 1909. 
Pye sur ies gouttelettes collectices des ovules des coniféres. 
Author’s reprint from Mém. Soc. Linn. Normandie (?):51-66. pis. 
3d Lo): 
26. YounG, Mary, The morphology of the Podocarpineae. Bor. Gaz. 50: 
81-100. pls. 4-6. 1910. 
25b. 
EXPLANATION OF PLATES I-III 
Fic. 1.—A pollen tube branching after entering the nucellus; the tip of 
the tube is just at the upper border of the figure. 
Fic. 2.—A part of the body cell, showing part of the upper male nucleus 
and what appears to be the remains of the nuclear spindle concerned in the 
division of the body cell nucleus; the male nuclei are in the resting state, but 
the cytoplasm has not yet begun to divide. : 
Fic. 3.—The two male nuclei in a body cell whose cytoplasm has not yet 
completely separated into distinct male cells; X 250. 
Fic. 4.—Two male nuclei in a pollen tube running horizontally between 
the nucellar cap and the female gametophyte; the cytoplasm is unusually 
scanty and shows no sign of division, nor does either nucleus appear larger or 
more active than the other; X 250. 
G. 5.—A binucleate body cell rounding a sharp corner of the pollen tube 
where it turns back from the surface of the scale to enter the nucellus; a part 
of the pollen tube wall is shown above and another part in the bend on the 
right; X 250. 
Fic. 6.—A fully formed male cell or sperm about half-way down the 
pollen tube; the nucleus is at the forward end and a fragment of the degen- 
erating nucleus that should have formed a separate male cell out of the part 
of the cytoplasm above and to the left of the cleavage furrow; 250 
Fic. 7.—The egg nucleus and disintegrating ventral canal nucleus; X 250. 
Fic. 8.—Upper end of an archegonium with a large ventral canal nucleus 
(at the top), a small egg nucleus (bottom), and a small extra nucleus between; 
X 250. 
Fic. 9.—A mature egg nucleus showing the dense chromatin masses dis- 
tributed on the delicate linin network and to a less extent in contact with the 
nuclear membrane; the wrinkles in the nuclear membrane are doubtless due 
to the effects of the reagents used in preparation; X 560. 
Fic. 1o.—The neck of an archegonium through which a pair of male cells 
has entered; note that the neck has not been ruptured, though the passage is 
