INDEX 



475 



Gleichenia, stem of, 278 



Gnetales, 357; and Bennettitales, 370; 



parenchyma in, 358; vessels in, 358; 



vine habit in, 364 



Gnetiim, 363; stem of, 363; vessels of, 367 

 Grape vine, septate fibers of, 34 

 Grinding wheels, 453 

 Guard cells, 129; number of, 131 



H 



Hairs, 130 



Hard tissues, preparation of, for sec- 

 tioning, 447 



Heartwood: condition of parenchyma 

 in, 56, 57; heartwood or duramen, 55 



Helianthus: compared with Casuarina, 

 404; diagram to illustrate herbaceous 

 type, 403; H. hirsutus, ray situation in, 

 400, 402, 404; H. tnberosus, oil canals 

 of ; 434 



Hematoxylin, 457 



Herbaceous and arboreal types in rela- 

 tion to climatic conditions, 430 



Herbaceous dicotyledons, 186 



Herbaceous type: geographical distribu- 

 tion of, 430; in geological time, 431; 

 origin of, in cryptogams, 387, in the 

 dicotyledons, 186, 387, in Helianthus, 

 400, 402, 404, in Potent ilia, 187, in 

 Salvia, 189, in Urtica, 397 



Herbs, substitute fibers of, 35 



Heterangium, stem of, 293 



Hones, types of, 453 



Hydrofluoric acid, uses of, 447 



Hypoderma, 128 



Imbedding in nitrocellulose, 450 



Inclusion of pith: within leaf traces, 285; 

 within stele of stem, 284 



Intercellular spaces, 2 

 Iodine, uses of, 446 

 Iris, pericarp of, 2 

 Iron alum, 457 

 Isoetes, 255 



K 



Kinds of plates useful for photomicrog- 

 raphy, 463, 466 



Knives, 453; position of, 453 



L 



Labiates, origin of herbaceous type in, 189 

 Lamium, origin of herbaceous type in, 190 



Lantern slides, 467 

 Larch, root of, 22, 145 



Large storage rays in relation to climatic 

 conditions, 430 



Laticiferous system in the Compositae, 



435 

 Lattices, 122 



Leaf: centripetal wood of, in Prepinus, 

 208; concentric bundles of, in Cycas, 

 201, 302; cortical bundles of, in Cycas, 

 201, 302; of Cycadales, 199, 300; defi- 

 nition of, 141; gap of, in Casuarina, 

 8 1, in conifers, 80, in Cordaitales, 203; 

 organization of, in Alnus, 213, in 

 Casuarina, 211, in dicotyledons, 213, 

 in Gnetales. 211, in monocotyledons, 

 213, in Pitms, 205, 330, in Prepinus, 

 207, 331; rachis of Cycadales, 199; 

 transfusion tissue in Casuarina, 311, 

 in Cordaitales, 203, in Pinus, 206, in 

 Prepinus, 207; vegetative, 199 



Leea, organization of stem in, 184, 389, 

 396; origin of woody cylinder of, 184, 

 389 



Leguminosae: fibers and tracheids of, 33; 

 origin of herbaceous type in, 191 



Lenses, photomicrographic, 462 

 Lepidocarpon, 224 



Lepidodendraceae, 250, 255; secondary 

 wood of, 16, 260 



Lepidodendron, 256; primary wood of, 

 170; rays in, 258; septate tracheids of, 

 38 



Libriform fibers, 32 



Lights for photomicrographic purposes, 



466 



Ligulifloreae, laticiferous system of, 435 

 Liquidambar, fibers of, 106 

 Liriodcndron, parenchyma of, 51; vessels 



of, 97, 100 



Lycopodiales, 250, 252 

 Lyco podium, 19, 252; root and stem of, 



Lycopods, wood of, 252 



Lycopsida, geological range of, 244; 

 microphylly in, 245 



Lyginodendron, 296 



M 



Maceration, 446 



Magnolia, fiber tracheids of, 32; paren- 

 chyma of, 5 1 



Marginal tracheids: of Cupressineae, 73, 

 341; of Taxodineae, 72, 339 



