Allen—Spermatogenesis and Apogamy in Ferns. 
45 
Description of Plates. 
The drawings were made with a camera lucida. Figures 
1-25 are magnified 2250 diameters. Figures 26, 34, 35 and 
42-61 are magnified 1950 diameters. Figures 27-33 and 
36-37 are magnified 2700 diameters and 38-41 are 162 diame¬ 
ters. 
The drawings are arranged in regular sequence on the plates 
except number 38 to 41 which are omitted in plate 3 and 
placed by themselves on plate 4. 
Plate 1 —Adiantum Capillus-Veneris. 
1. Young antherid. Small. Nucleus containing heavy 
-chromatin network—-no nucleole. Blepharoplast large and ir¬ 
regular. 
2. Same stage. Blepharoplast comma-shaped. 
3. Same stage. Blepharoplast showing dense granules. 
4. Later. Nucleole present. Blepharoplast more sharply 
hounded. 
5. Later. Cell larger. Blepharoplast spherical, dense. 
6. Blepharoplast elongated to a band parallel to the surface 
of the nucleus. Nucleus in center of cell. 
7. Same stage. Nucleole present. Nuclear net more open. 
Blepharoplast cut twice at a and b. 
8. Same cell as 7. Surface view of blepharoplast. 
9. Same stage. Corresponds to 6. Space between blepharo¬ 
plast and nuclear membrane. 
10. Older. Cell rounded. Nucleus larger and at the side 
of the cell. Nucleus somewhat elongated, having formed an 
anterior beak. Blepharoplast seen in edge view. It extends 
along the whole convex outer surface of the nucleus and on 
into the cytoplasm at the anterior end. 
11. Same stage. Longitudinal section at right angles to 10. 
Width of blepharoplast seen at two points —a and b. 
12. Same stage. Median cross section showing the width of 
the blepharoplast. 
13. Later. Nucleus forms three-fourths of a coil. Nucleus 
