LIST OF ILLUSTRATIONS 



FIG. 



73. Lepidostrobus Veltheimianus. Transverse section of cone through 



megaspore-region ... . .184 



74. Lepidostrobus Veltheimianus. Longitudinal section of cone . 185 



75. Spores of Lepidodendreae. A. and B. Spencerites insignis. C. 



Lepidostrobus Veltheimianus. D. A single megaspore . 186 



76. Lepidostrobus foliaceus. Megaspore . . . 186 



77. Lepidostrobus Veltheimianus. Megaspore in section showing 



prothallus . . . t T 88 



78. Mazocarpon. Isolated megaspore showing prothallus 188 



79. Spencerites insignis. Somewhat diagrammatic radial section 190 



80. Lepidocarpon Lomaxi. Sporangium and sporophyll . . 194 

 81 ■ ,, ,, Upper part of integumented " seed " 195 



82. ,, ,, Diagrammatic section of " seed " . . 196 



83. Miadesmia membranacea. Approximately transverse section of 



seed-like organ . . ..... 198 



84. Miadesmia membranacea. Radial section of seed-like organ . 199 



85. Stump and roots (Stigmaria ficoides) of a Lycopodiaceous 



tree ... . ... 206 



86. Sigillaria tessellata [Favularia type). Surface of stem . 207 



87. Sigillaria mamillaris {Rhytidolepis type). Surface of stem . 208 



88. Sigillaria Brardi (Leiodermaria type). Part of surface of stem 209 



89. Sigillaria Menardi (Clathraria type). Section and surface 216 



90. Sigillaria spinulosa. Part of transverse section of stem 220 

 9 1 - .. .. Part of wood more highly magnified 220 



92. , , , , A. Tangential section of outer cortex. B. 



Leaf. C. Sigillaria latifolia. Transverse section of leaf . 222 



93. Sigillaria [Rhytidolepis type). Segment of stem in transverse 



section ... . .... 



94. Sigillaria scutellaia. Transverse section of a portion of the 



wood .... 



95. Sigillariopsis sulcata. Transverse section of leaf 



96. Sigillariostrobus rhombibracteatus. A. Part of cone. B. S. 



ciliatus. Part of axis with sporangia. C. Megaspores . 234 



97. Stigmaria Jicoides. Part of surface ..... 238 



98. , , , , Transverse section of a small specimen 243 



99. , , , , Part of tangential section through wood 245 



100. , , , , Part of transverse section with rootlet 247 



101. ,, ,, Transverse section of rootlet . 250 



102. ,, ,, Part of transverse section of rootlet . . 252 



103. ,, ,, Transverse section of rootlet showing vascular 

 system .... 254 



104. Stigmaria ficoides. Transverse section of central part of rootlet . 255 



105. , , , , Transverse section of rootlet showing 

 dichotomy ... . 256 



106. Stigmaria, sp. Transverse section of an axis with centripetal 



wood ... .... 258 



107. Pecopteris (Dactylotheca) dentata. Part of a frond . . . 271 



108. Ptychocarpus unitus. Fructification. A. Part of a fertile pinnule. 



B. Synangia in side view. C. A synangium .... 278 



109. Group of Palaeozoic fructifications of Ferns or Pteridosperms. A. 



Asterotheca. B. Renaultia. C. Dactylotheca. D. Sturiella. 

 E. Oligocarpia. F. Crossotheca. G. Senfienbergia. H. 

 Hawlea. J. Urnatopteris . ..... 280 



no. Scolecopteris polymorpha. A. Lower surface of a fertile pinnule. 



B. Transverse section of half a pinnule showing synangium . 283 



227 

 229 



