INDEX 



483 



Megasporophyll, evolution in Bennetti- 



tales, ijS; in cycads, ij8; theoretical, 



159 

 Metaplasm, 138 

 Microcachrys, 2gg 

 Microcycas, 6j, 66, 77, /j^ 

 Microspore, Cycadeoidea, 56 

 Microsporangia, in Cycadeoidea, 54, 55; 



in cycads, 114, 115, 116, 117; sori, 7/5, 



116; Coniferales, 284 

 Microsporophyll, in Cycadeoidea, 53; in 



cycads, 112, 113, 114; Coniferales, 2^^ 

 Monoecism, 275 

 Mosaic, leaf, 2^4 



Needle leaves, origin, 2g3 

 Neuropteris, 17 



Otozamites, 43 



Ovule, Ginkgo, igg-201; Coniferales, 2g8- 



302 

 Ovuliferous scale, 294, 295, 296, 2g8-30i 



Pecopteris, 25, 27 



Peels, 2 



Phanerostrobilares, 230 



Pherosphaera, ovule, 2gg 



Phloem, Cycadofilicales, ij; Bennetti- 



tales, 47; cycads, 86, 87; Ginkgo, igj; 



Coniferales, 246, 247, 248, 24g 



Phyllocladus, 237, 260 



Phylogeny, in Bennettitales, 59; in cy- 

 cads, 155; Cordaitales, 180; Ginkgo- 

 ales, 215; Coniferales, 427; Gnetales, 

 433 



Picea sitchensis, 222; P. nigra, 246; P. ex- 

 celsa, bisporangiate strobili, 278, 27g 



Pinares, 230 



Pinus lambertiana, 218, 220; P. ponderosa, 

 218; P. thiinbergia, 226; P. sabiniana, 

 234, 236; P. torreyana, 234, 238; P. 

 strobus, 242, 263; P. paliistris, 255, 7,jg; 

 P. laricio, leaf, 263; mother-cell, 303; 

 embryo, 344; P. edulis, root, 271, seed- 

 ling, 358; P. contorta, 276; P. maritima, 

 bisporangiate, 278, 2S0; P. banksiana, 

 strobilus, 286; ovuliferous scale, 2gj; 

 fertilization, 340; embryo, j^p, 353; 

 P. radiata, strobilus, 2go 



Podocarpiis, strobilus, 282; ovule, 301; 

 embryo, 347 



Polarity, in embryogeny, 140 



Pollen chamber, 36 



Pollen tube, in cycads, 129, 130; Ginkgo, 

 207; Coniferales, 308, 334 



Pollination drop, 313 



Pollination, in cycads, 127-29; pollina- 

 tion drop, 1 29 



'Polycotyledony, 354, 336 



Polyembryony, 348, j^p, 350 



Proliferation, 29^ 



Proteid vacuole, 327 



Prothallial cell, in cycads, 128, 130; Gink- 

 go, 207; Coniferales, 308, 309; Arau- 

 caria, 310, 311 



Protoxylem, 14, 83, igj, 271 

 Psaronius, 9 

 Pseudotsiiga, 218, 2gi 

 Pteridosperms, 28 

 Pterophylliim, 42 

 Ptilophylliim, 42 

 Piiccinia, 339 



Quaternary, 4 



Rachiopteris, 8 



Ramentum, 31 



Rays, medullary, 86, 87, 272; Ephedra, 367 



Ray tracheids, 242, 243, 244 



Recapitulation, 96, 261, 262, 338 



Reconstruction, Carboniferous, 35; life- 

 history, 37, 39 



Rhaetic, 4 



Rings, growth-, 81, 82, 83 



Resin canals, 250 



Root, cycads, g8; tubercles, gg, 100; my- 

 corrhiza, 262; hairs, 262, 267; adven- 

 titious, 26g; histology, 267, 270, 271, 

 272 



Rosette, embryos, 350, 333 



Salix, abnormalities, 279 

 Sanio, bars, 84, igi, 244, 243 

 Saxagothea, 2gg 

 Sciadopitys, 259; leaf, 264 

 Seed, 29; in Cycadeoidea, 58, 157; cycads, 

 148; Coniferales, 337 



Seedling, cycad, g8, i4g; anatomy, 130- 

 52; Ginkgo, 214; Pinus, 338, 33g 



Selaginella, 30, 157 

 Sequoia, 218, 223, 224, 343 

 Sieve areas, 248, 24g 

 Siphonostele, in Microcycas, 132 



