466 



MORPHOLOGY OF GYMNOSPERMS 



Taxmeae3i3; archegonia 332; male cell 

 337, 33S, 339; male gametophyte 335, 

 336,337 



Taxodineae 221; archegonium 268; dis- 

 tribution 301; history 304; male cell 

 27p; proembryo 2gi, 2g2; prothallial 

 tissue 277 



Taxodium, embryo 2gy; habit zz6; male 

 gametophyte 27p; proembryo zgi 



Taxus, female gametophyte 330; male 

 cell 338; megasporangium 328; micro- 

 sporangium 24.3 



Thuja, archegonium 270; juvenile leaves 

 22y; male gametophyte 280; pro- 

 embryo 2g3 



Torreya, embryo 341, 34g; female 

 gametophyte JJ7; male gametophyte 

 336, 331; microspore 336; ovulate 

 branch 322; ovulate strobilus 323; 

 seed 332, 333 



Trigonocarpum 41, 44, 45 



Tumboa 363 



Tyloses, Pinaceae 235 



V 



Vascular anatomy, Bennettitales 70; 

 Cordaitales 165; Cycadales93; Cyca- 

 dofilicales 12; endarch 10, 11; evolu- 

 tionary tendencies 411; exarch 10, 11; 



Ginkgoales 187; Gnetales 366; leaf 

 gap 9, 10; mesarch 10, 11; Pinaceae 

 228; polystele s, */ protostele 4, 5; 

 Pteridophytes 4; siphonostele 4, 6, 7, 

 9; solenostele s; Taxaceae 315 



Ventral canal cell, Pinaceae 265, 266, 

 267; Taxaceae 331 



Ventral nucleus, Cycadales 136 



W 



Welwitschia, embryo 3g8; female game- 

 tophyte 37g; flower 373; habit 365, 

 366; seedling 3gg; spicular cells 36g; 

 strobilus 374 



Williamsonia, habit 68, 6g 



Yezonia 307 

 Yezostrobus 307 



Zamia, embryo 151; fertilization i$o; 

 habit J J2; leaf iio; male gametophyte 

 144; megaspore 127; megasporophyll 

 124; microspore 140; microsporophyll 

 117; sperm 14s; stem apex 11$; 

 stem section g6 



Zygopteris 54; sporangium 55 



FEINTED m THE U.S.A. 



