Spiral bands, 27. 

 Spiral tracheides, fiS. 

 Spirogyra nitida, '27 



Germination, 29 ; Eepro- 



duction of, 28. 

 Spongy parenchyma, 68. 

 Sporangium, 4, 59, 71. 

 Spore capsule, 47, 54. 

 Spore mother cells, 47. 60, 71- 

 Spores, 2, 5, 21, 48, 49, 53, o4, 



tl. 

 Spore sac, 54. 

 Sporogonium, 47, 53, 54. 

 Sporophyte, 49, 53, 55. 

 Starch, 1, 32, 49, 68. 

 Starch-cellulose, 21. 

 Stem of Aspidium, 66, 75. 



,, Fiicus, 33. 



,, Funana, 51. 



,. Selaginella, 56. 

 ^terigmata, 9. 15. 

 Stigmatic (iells, 4 6, 74 

 Stomata, 39, 51, 58, 68. 

 Stylospoies, 9. 

 Sub-hymenial layer, 14, 21. 

 Succinic acid, 3. 

 Suspensors, 7. 

 Suspensor, the, 63. 

 Swimming bladdeis, 33. 

 Symbiosi.'^, 18. 

 Sympodial, 30. 

 Sympodium, 31. 



Tapetum, 59. 



Teeth, 55. 



Tetrahedral apical cell, 71. 



Thallus. 16, 30. 



Theca, 53. 



I'hrush, 3. 



Tissues. 57. 



Torula, 1. 



Trabecule, 58. 

 Tracheides, 52, 57, 68. 

 Trama, 14. 



Transversal wall, 75. 

 Tnchomes, 34. 



Vacuole, 1, 5, 6, 14, 17. 



Vag inula, 54. 



Vascular bundles, 66. 



Vascular cylinder, 69. 



Vegetative cell, 60. 



Vein, 68. 



Ventral canal cell, 4o, 53, 62, 



73. 

 Ventral cell, 45. 

 Ventral cortical layer, 40, 

 Ventral portion, 45, 53. 

 Vernation, 65. 



Wall, the, 47. 

 Water, 68. 

 Water-withdrawino" medium, 



27. 

 Vv^iiigs, the, 32. 

 Wood, 57, 68, 69. 



Xvlem, 57, 68. 



*/ 7 7 



Ypast, Distribution of, 2 ; Ee- 

 production of, 2 ; Structure 

 of, 1. 



Zoospore, 25. 

 Zygnemace.ie, 27. 

 Zygomycetes, 4. 

 Zygospore, 7, 29. 

 Germination of, 8. 



