484 EXPLANATION OE THE FIGURES. 



jig. 



26. Longitudinal section of the apex of a very young stipule, x 400. 



27. Same section of a half-developed stipule, x 200. 



28. Outline of a slightly more developed stipule, seen from the surface, 



x 100. 



29. Longitudinal section of the growing apex of a young fruit-branch, x 350. 



Pigs. 30, 31. Selaginella spinulosa. 



30. Rudiment of a fruit in longitudinal section, x 30. 

 30*. Young macrospore. 



31. Young macrospore. 



PLATE LVI. 

 Pigs. 1—9, 11 and 12. Selaginella Galeottii ; 10. Selaginella Martensi. 



1 . End of a shoot bearing only leaves ; seen in longitudinal section of the 



wide side (obtained by adjusting the microscope to the longitudinal 



axis), x 400. 

 l b . The same, seen from outside. 

 l c . The same, seen from outside the narrow side. 



2. Oblique view from above of the end of a shoot, x 400. 



3. Longitudinal section of terminal bud parallel to the wide side, X 400. 



4. Apex of the same seen from above, X 400. 



5. Middle of the fore-edge of a young superior leaf, x 300. 



6. Tip of a somewhat more developed inferior leaf, x 600. 



7. Pragment of the lateral margin of a perfect inferior leaf, x 300. 



8. Pragment of the same, nearer to the mid-rib. 



9. A very young stipule seen from the surface, x 500. 



10. Adventitious shoot of S. Martensi, produced by a fragment of a stem bitten 



off by wood-lice, x 10. 



11. Half of a longitudinal section of a very vigorous shoot of S. Galeottii, 



passing through the median lines of two opposite rows of superior and 

 inferior leaves (the former are to the right in the figure), X 200. 



12. Portion of a similar specimen, x 200. 



PLATE LVII. 



Pigs. 1 — 12. Selaginella Martensi. 



1. Mother-cell of large spores, with some of its abortive sister-cells, x 300. 



2. A similar mother-cell. 



3. Mother-cell of large spores, in which, near the large vauishing primary 



nucleus, four daughter-nuclei are formed (three only of the latter are 

 visible), x 300. 



