427 
Rhabdonia tenera, % Ag. 
Fig. 9. More advanced stage than Fig. 8. The tip of the young plant is seen in 
median optical section, showing a central filament (c, c, c &c.) and the branches 
which proceed from it. At the base of the plant rhizoidal filaments, rh , are 
beginning to grow out. X 280. 
Fig. 10. Median longitudinal section of frond, showing the elongated cells of the 
medulla with highly refractive plates between the cells. At the right, two lateral 
branches of the cortex ; from the lower arises a young procarp. X420. 
Fig. 11. Median longitudinal section of frond, showing trichogyne reaching 
surface. X474. 
Fig. 12. Trichophore, tr, putting out a conjugating-tube which has reached an 
auxiliary cell, cpg, and conjugated with it. o, a second (abortive ?) conjugating-tube. 
Other letters as in Fig. 2. From a crushed preparation, x 128. 
Fig. 13. Trichophore sending out two conjugating-tubes ct ; the trichogyne, /r, 
is pushed to one side and is disintegrating at the end. From crushed preparation, 
x 535- 
Fig. 14. Part of Fig. 12 enlarged ; letters as in Fig. 12. The conjugating-tube, r/, 
proceeding from the trichophore shown in Fig. 12, fr } is seen conjugating with the 
auxiliary cell. From crushed preparation. X550. 
Fig. 15. Procarp showing the beginning of a trichogyne. From crushed 
preparation. x 77°* 
Fig. 16. Transverse section of male plant, showing antheridia. From living 
material, x 1 1 6o„ 
