1 58 Campbell . — The Gametophyte , &c. } of Bo try chium ohliquum . 
EXPLANATION OF PLATE VIII. 
Illustrating Mr. D. H. Campbell’s paper on the Gametophyte and Embryo of Botrychium obliqmim. 
Figs. 1, 2. Young gametophytes seen from above, x 20. 
Fig. 3. An older gametophyte, seen from above, showing the median antheridial ridge. 
Fig. 4. Adult gametophyte, with the root of the young sporophyte emerging on the ventral 
side, x 40. 
Fig. 5. Gametophyte with young sporophyte attached. The cotyledon emerges from the dorsal 
surface, the root, v, from the ventral side. A lateral root has formed from the primary root.,- x 5. 
Fig. 6. Gametophyte, with young sporophyte attached, x 3. 
Fig. 7. Young sporophyte, showing the ternate cotyledon, x 3. 
Fig. 8. Median longitudinal section of young gametophyte, showing the growing-point, x. 
X 58. The shaded portion indicates the region occupied by the mycorrhiza. 
Fig. 9. Apical region of the gametophyte. x 360. 
Fig. 10. Two cells from the gametophyte showing the endophytic fungus. , x 600. n, nucleus 
of the gametophytic cell ; sp., ‘ spore ’ of the fungus. 
Fig. 11. Transverse section through the antheridial ridge of a young gametophyte. x 95. 
young antheridia ; <j>, an archegonium. 
Fig. 12. Transverse section of an older gametophyte. x 58. The shaded area indicates the 
extent of the region occupied by the endophyte. 
Figs. 13, 14. Young antheridia seen in median longitudinal section, x 480. 
Fig. 15. An older stage, x 360. 0, opercular cell. 
Fig. 16. Surface view of an antheridium, showing the opercular cell, o. x 360. 
Fig. 17. Spermatocytes with nearly ripe spermatozoids. x 1120. 
Fig. 18. Two free spermatozoids. x 1120. 
Figs. 19, 20. Very young archegonia. x 480. 
Fig. 21. Archegonium, showing primary neck canal cell. X 360. 
Fig. 22. Venter of a ripe archegonium. The ventral canal cell, v, not separated by a wall from 
the egg-cell. Two nuclei in the neck canal cell. 
