M. Miiller on the Development of (he Lycopodiaccse. 325 



Fig. 8. Tlie branch-biul from fig. 6 a, unfolded ; «, pre-formed leaf. 250. 



Fig. 9. The same unfolded, with the terminal bud of the young branch a. 

 250. 



Fig. 10. The last magnified 400 times. 



Figs. 11 — 19. Germinating plants, more or less developed, magnified 5 to 

 10 times. 



Plate III. 



Fig. 1. Accessory organ of the leaf. 250. 



Fig. 2. The same cut across between the leaf and branch parenchyma. 400. 



Fig. 2a. The same cut across between a leaf and branch. 50. 



Fig. 3. The same, magnified, at the apex, 400 times. 



Fig. 4. The same, bifurcate. 250. 



Fig. 5. The same cut lengthways. 400. 



Fig. 6. The same in its earliest development on a young leaf from the ter- 

 minal bud of germinating plant, seen laterally. 400. 



Fig. 7. The same, seen crossvvays. 400. 



Fig. 8 and 8a. The same in course of development on the youngest branch 

 of the perfect plant. 250. 



Figs. 9 and 10. The same, isolated and more developed. 250. 



Fig. 11. Longitudinal section of the axis-branch, to show the various ana- 

 tomical relations : a, accessory organ with its basilar cells; b, cor- 

 tical layer of the branch ; c, inner leaf-cells ; d, the elongated base 

 of the leaf. 250. 



Fig. llx. Longitudinal section of the leaf. 50. 



Fig. 12. Cross section of the axis-branch. 250. 



Fig. 13. Longitudinal section of the apex of the branch. 50. 



Plate IV. 



Fig. 1. Cross section of a branch at a node with the branch-root forming. 50. 



Fig. 2. The same. 50. 



Fig. 3. The oophoridium, in situ. 50. 



Fig. 4. The same, ^en from beneath. 50. 



Fig. 5. The same, seen from above. 50. 



Fig. 6. Two branches producing, a, an oophoridium, and b, a spike with an- 

 theridia. 250. 



Fig. 7. An oophoridium in longitudinal section, in a very young condition : 

 «, the epidermis of the oophoridium ; b, the same, produced down- 

 ward at the base ; c, mother-cell of the spores ; d, contents of the 

 future fruit-stalk. 250. 



Fig. 8. The same, seen from behind. 250. 



Fig. 9. A similar one with a more highly magnified mother-cell a ; b, cells 

 on the base of the interior of the oophoridium. 400. 



Fig. 10. An oophoridium, very young, in situ, seen from above. 10. 



Fig. 11. The same, the longer side. 10. 



Fig. 12. The same, the shorter side. 10. 



Fig. 13. The spikelet with the oophoridium. 10. 



Fig. 14. Oophoridium a, and antheridia b, in situ on a fruit-axis cut longi- 

 tudinally. Only the central portion, represented with the cortical 

 layers of the axis removed. 50. 



Fig. 15. Mother-cells from the oophoridium of Lye. selaginoides, with four 

 young spores. 250. 



Fig. 16. the last magnified 400 times. 



Plate V. 

 Fig. 1. Spores from the antheridium. 

 Figs. 2 — 6. The terminal bud of the antheridia-spike, with the antheridia 



forming upon it. 400. 

 Fig, 7. An antheridium, more perfect. 400. 



