X 



458 



MORPHOLOGY OF GYMNOSPERMS 



Taxineae3i3; archegonia 332; male cell 

 337, 338, 339; male gametophyte 335, 



33'^, 337 



Taxodineae 221; archegonium 268; dis- 

 tribution 301 ; history 304; male cell 

 2jg; proembryo 2gi, 2g2; prothallial 

 tissue 277 



Taxodium, embryo 2gj; habit 226; male 

 gametophyte 279; proembryo zgi 



Taxus, female gametophyte ;}^o; male 

 cell 238; megasporangium ^28; micro- 

 sporangium 242 



Thuja, archegonium 2yo; juvenile leaves 

 22y; male gametophyte 2S0; pro- 

 embryo 2g^ 



Torreya, embryo 247, 3491 female 

 gametophyte 337; male gametophyte 

 jjd, 237') microspore j?j(5; ovulate 

 branch J22; ovulate strobilus 323; 

 seed 332, 333 



Trigonocarpum 41, 44, 42 



Tumboa 363 



Tyloses, Pinaceae 235 



V 



Vascular anatomj', Bennettitales 70; 

 Cordaitales 165; Cycadales 93; 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 5, S; protostele 4, 5; 

 Pteridophytes 4; siphonostele 4, 6, 7, 

 9; solenostele 5; Taxaceae 315 



Ventral canal cell, Pinaceae 265, 266, 

 267; Taxaceae 331 



\"entral nucleus, Cjxadales 136 



W 



Welwitschia, embryo 3g8; female game- 

 tophyte 3yg; flower 373; habit 365, 

 366; seedling 3gg; spicular cells 36g; 

 strobilus 374 



Williamsonia, habit 68. 6g 



Yezonia 307 

 Yezostrobus 307 



Zamia, embryo iji; fertilization ijo; 

 habit 112; leaf no; male gametophyte 

 144; megaspore 727; megasporophyll 

 124; microspore 140; microsporophyll 

 117; sperm 143; stem apex 113; 

 stem section g6 



Zygopteris 54; sporangium 55 



