462 



MORPHOLOGY OF GYMNOSPERMS 



321, 322, 323, 324; vascular anatomy 

 228, 315; vegetative organs 222, 315; 

 ventral canal cell 266, 267 



Coniferophytes 59 



Conostoma 37 



Cordaianthus 173, 175; ovules 176, 177; 

 microspore 177; stamen 174 



Cordaitales 163; archegonium 17 g; dis- 

 tribution 180; embryo 180; female 

 gametophyte I7g; history 180; leaf 

 168, i6g, 170; male gametophyte 177, 

 178; megasporangium 174; micro- 

 sporangium 172, 173, 174; microspore 

 177; relationship 180; root J71; stamen 

 174; strobilus 172, 173, 17s; vascular 

 anatomy 165; vegetative organs 164 



Cordaites, leaf i6g, 170; root 171; stem 

 section 165, 166, 167; strobilus 172 



Cotyledon, evolutionary tendencies 428, 

 42g; Pinaceae 297 



Crossotheca 25, 26, 27, 28, 2g 



Cryptomeria, female gametophyte 261; 

 male gametophyte 27g; strobilus 324 



Cunninghamia, male gametophyte 27g; 

 proembryo 2gi; strobilus 324 



Cupressineae 221; archegonia 269, 270; 

 distribution 301; history 305; male 

 cell 280; proembryo apj, 2g4; pro- 

 thalhal tissue 277 



Cupressus, male gametophyte 280; stro- 

 bilus 324 



Cycadales 91; archegonium 133, 135; 

 distribution 156; embryo 150, 151, 

 152, J53, 154, 155; female game- 

 tophyte 132, 137; fertilization 148, 

 150; history 156; leaf 108, log, no; 

 male gametophyte 139, 141, 143, 144; 

 megasporangium 121; megaspore 127; 

 megaspore membrane i3g; megasporo- 

 phyll 124, 131; microsporangium 114, 

 118, iig, 120; microspore 140; micro- 

 sporophyll 116, 117; relationship 157; 

 root 112, 113; seedling structure 98, 

 gg, 100, loi, 102, 103, 104, IDS, 106; 

 sperm 145, 146, 147; strobilus 114,. 

 122, 123, 125; vascular anatomy 93; 

 vegetative organs 93 



Cycadella, ramentum 70 



Cycadeoidea, microsporophyll 77; seed 

 84; strobilus 73, 76, 80, 81, 82; synan- 

 gium75; trunk 57 



Cycadinocarpus, ovule section i7g 



Cycadofilicales i; distribution 51; em- 

 bryo 46; female gametophyte 48; 

 history 51; leaf i, 21, 22, 24; male 

 gametophyte 49; megasporangium 31; 

 microsporangium 25, 26, 27, 28, 2g; 

 microspore 4g, 50; origin 55; relation- 

 ship 51, 58; seed 31, 32, 33, 34, 3S, 36, 

 38, 3g, 40, 42, 43, 44, 45; vascular 

 anatomy 12; vegetative organs 3 



Cycadophytes 59 



Cycadoxylon 16, 17 



Cycas, archegonium 135; embryo 152; 

 leaf log, in; male gametophyte 143; 

 megaspore membrane I3g; megasporo- 

 phyU 124; microsporophyll 117; root 

 tubercle 113; seed 130; sperm J4S; 

 strobilus 123; ventral nucleus 136 



D 



Dacrydium, male gametophyte 340 



Dadoxylon 168 



Dioon, archegonium 133, 13^, 138; 

 embryo IS3, 154; female gametophyte 

 132; fertilization I4g; habit pa, g4; 

 leaf no, in; male gametophyte 141; 

 megaspore membrane jjp; megasporo- 

 phyll 124; microsporangium 120; 

 microsporophyll 116; ovule 126, 128, 

 I2g; poUen tube 128; seedling struc- 

 ture 104, los; sperm 146; strobilus 

 122, 125; ventral nucleus 136 



Dorycordaites 164 



Ectophloic siphonostele s; Osmunda 7 

 Embryo, Bennettitales 83, 84; Cordai- 

 tales 180; Cycadales 150, 757, 152, 

 ^53t IS4, 155; Cycadofilicales 46; evolu- 

 tionary tendencies 426; Ginkgoales 

 210, 211, 212, 213; Gnetales 393, 

 394, 395, 397, 39^, 400; Pinaceae 287, 

 288, 28g, 2go, 2gi, 2g2, 2g3, 2g4, 29s, 

 2g6, 2g7, 2g8, 2gg; Taxaceae 346, 

 347, 348, 349 



