INDEX 



465 



megasporangium 256; megaspore 257; 

 microsporangium 243, 272; micro- 

 spore 2'/4; ovule 24s, 254; secondary 

 wood section 22g; seed 300; strobilus 

 238, 245, 246, 252; ventral canal cell 

 266, 26y 



Pitys 168 



Pityoxylon 304 



Platysperms 42 



Podocarpineae 313; archegonium 331; 

 male gametophyte 339, 340, 342 



Podocarpus, habit 314; leaf 31S; male 

 gametophyte 341; strobilus 324 



Polycotyledony 297 



Polystele 5, S 



Poroxylbn, stem 166 



Prepinus 304, 308 



Primofilices 54 



Proangiosperms 75 



Proanthostrobjlus 74 



Proembryo, Ephedra 3q$; Pinaceae 288, 

 28g, 2Q0, 2gi, 2g2, 2g3, 2g4; Taxaceae 



346, 347, 349 

 Prothallial tissue, Pinaceae 277, 278; 



Podocarpineae 339 

 Protopitys 20 

 Protostele 4; Gleichenia 5 

 Pseudotsuga, habit 223 

 Pteridophytes, vascular anatomy 4 

 Pteridostrobilus 75 

 Pteris, polystele 8 



R 



Rachiopteris 13 



Radiosperms 42 



Resin canal, Pinaceae 233 



Retinospora 225 



Root, Cycadales 112, 113 



S 



Saxegothaea, male gametophyte 341; 

 ovule 32Y 



Sciadopitys, proembryo 202 



Seed, Cycadofilicales 31, 32, 33, 34, jj, 

 3^, 3^1 39> 40,' paleozoic 42; Pinaceae 

 300; Stephanospermum 42, 43; Tax- 

 aceae 325; Torreya 332, 333 



tJeedling, Cycadales 98, gg, 100, loi, 

 H32, 103, 104, 10$, 106; evolutionary 



tendencies 427; Ginkgoales 188, igo; 



Pinaceae 231; Welwitschia 3gg 

 Sequoia, habit 224; megaspore 2^8; 



proembryo 292 

 Siphonostele 4; amphiphloic St ^! 



cladosiphonic 9; ectophloic 5, 7; 



phyllosiphonic 9 

 Solenostele 5 



Sperm, Cycadales 14s, 146, 147; evolu- 

 tionary tendencies 423 

 Sphaerostoma 37 

 Sphenopteris 22 

 Spicular cells, Welwitschia j<5p 

 Stamen, Cordaitales 174; evolutionary 



tendencies 415; Ginkgoales igi, ig2, 



ig3; Gnetales 371, 380; Pinaceae 



241; Taxaceae 319 

 Stangeria, megaspore 127; megasporo- 



phyll 130; microsporangium 119 

 Stauropteris 30 

 Stephanospermum 42, 43; microspore 



49,50 

 Strobilus, Bennettitales 72, 73, 76, 7g, 

 80, 81, 82; Cordaitales 172, 173, 17$; 

 Cycadales 114, 122, 123, 12s; evolu- 

 tionary tendencies 413; Ginkgoales 

 190, igi, ig2, ig3, igs, ig6, ig7, igS; 

 Gnetales 370, 372, 374, 37s, 376, 380; 

 Pinaceae 238, 23g, 240, 244, 246, 247, 

 252; Taxaceae 319, 320, 321, 322, 



323, 324 

 Suspensor, Pinaceae 295; Taxaceae 348, 



349 

 SutclifiBa 20 

 Synangium, Cycadeoidea 78 



T 



Taxaceae 220; archegonium 330; chro- 

 mosomes 329; distribution 349; em- 

 bryo 346, 347, 348, 34g; female game- 

 tophyte 329, 330, 337; fertilization 

 344, 345; history 349; leaf 317, 318; 

 megasporangium 321, 327; megaspore 

 membrane 332; microsporangium 319; 

 relationship 350; stamen 319; stro- 

 bilus 319, 320, 321, 322, 323, 324; 

 vascular anatomy 315; vegetative 

 organs 315 



