INDEX 



255 



Selaginella, megasporangium, 



*164 



megaspores, 163 



microspores, 163 



prothallus, 165 



roots, 162 



spinosa, 161, 162, 167 



sporangia, 163 



stem, 162 



Wildenovii, 161 

 Selaginellacea;, 156, 160 



fossil, 169-175 

 Selaginellites, 168 



primcevus, 169 



sporangia, 169 



Suissei, 169 

 Sigillaria, 177, 178, 179, 180, 



184, 234 



Silurian formation, 27 

 Solms-Laubach, Count, 80 

 Spermatozoids, 71, 122, 165, 

 236 



Cycads, 70, 76 



Equisetum, 197 



Maidenhair-tree, 71 



Microcycas, 75 



Zamia, *72 

 Sperms, 73 

 Sphenophylls, 212-219, 221 



relation to Calamites, 216- 



219 



Sphenophyllum, 210, 212-215, 

 *212 



cones, 214, *216 



Dawsoni, 215, *216 



fertile, 215 



fructification, 213, 214 



leaves, 213 



Rdmeri, 215 



roots, 214 



sporangia, 215 



sporangiophores, 215 

 Sphenophyllum 



sporophylls, 215 



Sphenophyllum, spores, 216 



stem, 212, 214 

 Sporangia 



Calamite, 206 



Cheirostrobus, 215 



Equisetum or Horsetail, 

 196 



Isoetes, 167 



Lepidodendreffi, 183 



Lycopodium, 158 



Marattiacese, 149 



Osumudaceae, 140 



Primofilices, 144 



Selaginella, 162 



Sphenophyllum, 215 

 Stauropteris, *146 

 Sporangiophore, 215, 217 

 Spore-plants, 101, 134 

 higher, 135 

 primitive, 219, 221 

 Spores 



Calamite, 206 



Equisetum, 195 



fossil germinating, *146 



Lepidodendrese, 183 



Lycopodium, 158 



Primofilices, 144 



Sphenophyllum, 216 

 Sporogonium, 223 



theory, 223-225 

 Sporophylls, 68, 157 

 Spurge, 45 



Stability periods, 231, 232 

 Stamens, 44 



Bennettites, 83, 90 



Cordaites, 129 



Cycads, 63 



Cycas, 67 



Dolerophyllum, 119 



Zamia, 65 

 Stangeria, 60 



leaf, 62 



schizodon, *59 

 Stapf, Dr., 8 



