192 INDEX 



Protohyenia, 95, g6, 178 

 Protohyeniaceae, 94 

 Protolepidodendraceae, 50 

 Protolepidodendrales, 51 

 Protolepidodendron, 51, 52, 178 

 protophyll, 64 

 protostele, 18, jp 

 protoxylem, 21 

 Psaronius, 129 

 Pseudosporochnaceae, 115 

 Pseudosporochnus, 117, 118, 178 

 Psilophytaceae, 28 

 Psilophy tales, 28 

 Psilophyton, 33, J5, i79 

 Psilophytopsida, 28 

 Psilotaceae, 38 

 Psilotales, 38 

 Psilotopsida, 38 

 Psilotum, 38, 41, 47, 180 

 Pteridium, 156, 163, 180 

 Pteridoideae, 163 

 Pteris, 156, 164, 180 

 Pteropsida, 114 



QUiLLWORT, 76 



RECAPITULATION, doctrine of, 57 

 recurving, 176, J77 

 reduction, J77, 178 

 Regnellidium, 168 

 resvirrection plants, 82 

 Rhacophyton, 121 

 rhizophores, 84, 87 

 Rhopalostachya, 54 

 Rhynia, 29, 31, 179 

 Rhyniaceae, 28, 182 

 royal fern, 142 



Salvinia, 172, 173 

 Salviniaceae, 171 

 Salviniales, 171 

 Schizaea, 153 

 Schizaeaceae, 152 

 Scolecopteris, 128, 129 

 secretory tissue, 70 

 Selaginella, 82, 84 

 Selaginellaceae, 50 

 Selaginellales, 82 

 Selaginellites, 91 

 Senftenbergia, 146 

 Sigillaria, 71, 73 

 Sigillariaceae, 68 

 Simplices, 150 

 siphonostele, 20 

 solenostele, 18, jp 

 solenoxylic stele, 136 

 SphenophyUaceae, 94 



Sphenophyllales, 97 



Sphenophyllostachys, g6, 99 



Sphenophyllum, g6, 97 



Sphenopsida, 94 



sporangia, 16 



sporocarps, 168, i6g, 171, 173 



sporophore, 170 



sporophyll, 17, 52, 54, 73, 75, 81 



sporophyll theory, 17 



sporophyte, 13 



'Stag's horn' fern, 167 



Stauropteridaceae, 116 



Stauropteris, 123, 123, 178 



steles, 18, Jp 



Stenochlaena, 164 



Stigmaria, 71, 74 



stomium, 124, 126, 144 



strobilus, 56 



Stylites, 78, 81 



Stylocalamites, 104 



suspensor, 61, 63, 134, 140 



Syncardia, 117, 118 



syngenesis, 177 



TAPETUM, 42, 60, 133, 144, 147 



telome theory, 176 

 teratology, 44 

 Thamnopteris, 141 

 Thelyptens, 180 

 Tmesipteridaceae, 38 

 Tmesipteris, 41, 42, 47 

 Todea, 142, 145, 181 

 tree ferns, 158, 160 

 Trichomanes, 156, 157, 180 

 Triletes, 91 

 Tuhicaulis, 123 



UNLIMITED GROWTH IN FERN FRONDS, 

 152, 154, J56, 159 



Urostachya, 54 



VALLECULAR CANALS, Io8 



velum, 78, 79 

 ventral canal cell, 46 

 vessels, 86, 109 



WATER FERNS, l68 



Woodwardia, 166 



Yarravia, 31, 32 



Zalesskya, 141 

 ZosterophyUaceae, 28 

 Zosterophyllum, 31, 33 

 Zygopteridaceae, 115 

 Zygopteris, 122 

 zygote, 13 



