364 



INDEX 



Spermatophytes, 208. 



Spike, 232. 



Spirogyra, 113. 



Spongy tissue, 18. 



Sporangium, Angiosperm, 224; 

 brown Algae, 121; conifer, 212; 

 Equisetum, 199; fern, 191; 

 Mucor, 141; red Algae, 126; 

 Selaginella, 203. 



Spore, 106; Angiosperm, 224, 235; 

 brown Algae, 121; Equisetum, 

 199; green Algae, 106; mildew, 

 145; (Edogonium, 108; red Algae, 

 126; rusts, 149, 151; swimming, 

 106; Vaucheria, 112. 



Spore-case, moss, 180. 



Spore-fruit, mildew, 146; red 

 Algse, 126. 



Sporophyll, 207; Equisetum, 199. 



Sporophyte, 171; Anthoceros, 173; 

 conifer, 215; club-moss, 202; 

 fern, 187, 195; Jungermannia, 

 173; leafy, 207; Lycopodium, 

 202; Marchantia, 170; moss, 

 179. 



Spring flowers, 67. 



Spur, 223. 



Squash, 315, 



Stamen, 224; Angiosperm, 221; 

 conifer, 212. 



Standard, 291. 



Starch, 21. 



Stem, 41; annual, 53; climbing, 

 47; direction, 42; erect, 42; ex- 

 ternal structure, 41; growth, 59; 

 internal structure, 50; perennial, 

 53; prostrate, 45; special forms, 

 59. 



Steppes, 344. 



Stigma, 227. 



Stimulus, 90. 



Stipe, 155. 



Stipule, 6. 



Stock, 56, 317. 



Stoma, 16. 



Stone-fruit, 239, 288. 



Strawberry, 286. 



Strobilus, club-moss, 202; conifer, 

 212; Equisetum, 198; Lycopo- 

 dium, 202; Selaginella, 203. 



Style, 227. 



Subsoil, 78. 



Subtropical desert, 341. 



Sucker, 70. 



Sugar-cane, 270. 



Summer spore, 149. 



Sundew, 38. 



Swamp, 331; forest, 336; thicket. 

 332. 



Sweet potato, 313. 



Swimming spore, 106. 



Sympetalae, 223, 282, 302. 



Tangerine, 299. 



Tap-root, 72. 



Tea, 300. 



Temperature, plant associations, 



325. 



Tendril, 35, 48, 60. 

 Testa, 85, 218, 237. 

 Tetraspore, 126. 

 Thallophytes, 165, 183, 208. 

 Thicket, mesophytic, 348; xero- 



phytic, 344. 

 Thorn, 35, 62. 

 Timber, conifer, 218; hardwood, 



284. 



Toadstool, 153. 

 Tobacco, 306. 

 Tomato, 306. 

 Tracheary vessels, 52; annular, 52; 



dotted, 53; pitted, 53; spiral, 



52. 

 Transpiration, 22. 



