Allen—Spermatogenesis and Apogamy in Ferns. 
47 
27. Resting cell at eight cell stage. Nucleus contains large 
nucleoles and finely divided chromatin. 
28. Antherid. Shows section through thick end of blepharo¬ 
plast. 
29. Same cell. Shows section of same blepharoplast at 
smaller end. 
30. Same stage. Surface view of blepharoplast 
31. Blepharoplast elongating. Cut obliquely. Projection 
on the nucleus below the blepharoplast. 
Plate 3. 
Figures 32-37. Development of antherzoid in Aspidium fab 
catum. 
Figures 42-47. Nuclear fusion in spore-soc of Aspidium 
falcatum. 
32. Blepharoplast elongated further. Nucleus touches mid¬ 
dle region of blepharoplast. 
33. Cross section, somewhat oblique, at the same stage, 
sh owing pro j ection. 
34. Shows long anterior beak. 
35. Median cross section through nucleus. Blepharoplast on 
outer side. Anterior projection below. 
36. One and a half coil stage. Anterior and posterior pro¬ 
jections slender. Bulk of nucleus in the center. The cell 
shows a pointed projection containing the anterior end of the 
blepharoplast. 
37. Posterior coil from nearly mature antherozoid. Starch 
grains in the cytoplasm. 
42. One of the eight equatorial plate stages in a spore-sac. 
43. One of the sixteen young spore mother cells. Cell small 
and angular. 
44. Beginning of fusion of spore mother cells. Cytoplasm 
of the two cells fused at the right. Projection on each nucleus 
extends toward the other. 
45. A broad lobe of one nucleus extends over to the other 
nucleus. Cytoplasm is still separate through more than half 
of the surface of contact between the two cells. 
