668 
Campbell. — The Structure and Affinities of 
but its affinities are with Archangiopteris rather than with Angiopteris. Of 
the two species examined, M. Smithii is nearer to Angiopteris than is 
M. Alidae. 
EXPLANATION OF PLATES XLVI-XLVIII. 
Illustrating Professor Douglas H. Campbell’s paper on the Structure and Affinities 
of Macroglossum Alidae , Copeland. 
PLATE XLVI. 
Fig. i. Young gametophyte seen from below, showing the first antheridia. x 2. 
Fig. 2. The apical region of the same, x 20. Young archegonia. 
Figs. 3, 4. Older gametophytes. x 2. Fig. 4 seen from below, showing the thick midrib 
covered with old archegonia. 
Fig. 5. An old gametophyte, showing the formation of adventitious buds, b. x 2. 
Fig. 6. Gametophyte, with very young sporophyte attached, x 2. 
Fig. 7. A large gametophyte which has branched dichotomously ; each branch has a sporophyte. 
x 2. 
Fig. 8. Sporophyte with three fully developed leaves, still attached to the gametophyte, pr. 
x 2. 
Fig. 9. Base of the third leaf, showing the stipules, si. x 4. 
Fig. 10. Young fifth leaf, x 2. 
Fig. 11. Base of a young sporophyte, with eight fully developed leaves ; si., stipules, x 2. 
Fig. 12. Surface view of the apical region of the gametophyte. x 365. 
Fig. 13. Longitudinal section passing through the apical region of the gametophyte. x , one of 
the marginal initial cells ; <j>, young archegonium. x 365. 
Fig. 14. Cross-section of the gametophyte, showing the position of the mycorrhiza, m. x 90. 
Figs. 15-19. Stages in the development of the antheridium, seen in longitudinal section ; Figs. 
15-17, x 600 ; Figs. 18, 19, x 365. m ., mantle cells. 
Fig. 20. Surface view of a young antheridium. 
Fig. 21. Surface view of an older antheridium, showing the triangular opercular cell. 
Figs. 22, 23. Spermatocytes, showing the development of the spermatozoid. bl., blepharoplast. 
x about 900. 
Fig. 24. Spermatozoid of Angiopteris. x about 900. 
PLATE XL VII. 
Figs. 25-31. Development of the archegonium, seen in longitudinal section, x 600. 0., egg- 
cell ; v.c . , ventral canal cell. 
Fig. 32. Full-grown archegonium, showing two distinct neck canal cells, x 365. 
Fig. 33. Two archegonia of Angiopteris. x 365. 
Fig. 34. Archegonium containing a one-celled embryo, x 600. 
Fig- 35- One-celled embryo, elongated laterally. 
Fig. 36. Two-celled embryo ; the upper (hypobasal) cell becomes the suspensor. 
Fig. 37. Median section of an older embryo, showing the very large suspensor, sus. 
c x about 90. 
Fig. 38. The same embryo more highly magnified ; the large shaded cell is perhaps the initial 
cell for the stem-apex. 
Fig- 39- A young embryo which was arrested in its development. 
Figs. 40-42. Three horizontal sections of an embryo somewhat older than that shown in Fig. 38. 
The initial of the root, r., is shown in the middle section, st., stem-initial (?) ; sus., base of the 
suspensor. 
