INDEX 



Selaginefla, 132 ; archegonium, 137; embryo, 

 137; female gametophyte, 136; habit, 

 133; sporangia, 134,' spores, 135. 



Selection, variable, 307. 



Selective action, 307. 



Sensitive plants, 429. 



Sepal, 252. 



Seta, loo, jo/, 103, 704, 105, 113, 116, 120. 



Shoot, permeable regions of, 311. 



Sieve plates, 242, 243. 



Sieve vessels, 242, 243; role, 394. 



Silphium, fertilization, 269; male gameto- 

 phyte, 267; microsporangium, 258. 



Siphonales, 33 ; conclusions, 37. 



Siphonostele, 133 ; amphiphloic, 157, 160; 

 ectophloic, 157, 162. 



Sleep movements, 455. 



Soil, 312 ; capacity for water, 313 ; effect of 

 roots, 315 ; water of, 313. 



Solids, 302. 



Solutes, 303; entry of, 316; natural, 303. 



Solution, 300, 303. 



Solvent, 303. 



Soredia, 79. 



Sorus, 156, 163, 165. 



Spadix, 277. 



Spathe, 277. 



Spectrum, absorption, 368, 369. 



Sperms, 17 ; thallophytes, 18, 19, 28, 30, 36, 

 43, 5> 5 2 > 56; bryophytes, 92, 05, 102, 

 112, 117; pteridophytes, 128, 129, 135, 

 140, 148, 167, 178, 444; gymnosperms, 

 199, 201, 211. 



Spermatium, red algae, 56 ; rusts, 83. 



Spermatophytes, 180. 



Spermatozoid, 17, 56. 



Spermogonium, lichens, 79 ; rusts, 83. 



Sphacelaria, 46. 



Sphaerella, 15. 



Sphaerocarpus, 105. 



Sphaeroplea, 27, 28. 



Sphaerotheca, 75. 



Sphagnales, no; conclusions, 114. 



Sphagnum, antheridia, 112; archegonia, 

 113; gametophyte, in ; habit, 112, 113; 

 leaf, in ; sporophytes, 113, 114. 



Sphenophy Hales, 143. 



Sphenophyllum, 143. 



Spiral vessels, 241, 243. 



Spirillum, n. 



Spongy region, leaf, 250, 251. 



Sporangiophore, 143, 146, 333. 



Sporangium, 3 ; thallophytes, 3, 27, 45, 58, 

 50, 67, 68; pteridophytes, 125, 126, 133, 

 '34, 139, 142, 143, 144, 146, 152, 153, 156, 

 157, 1 60,- 163, 164, 165, 352. 



Spores, 3, 16, 62, 147. 



Sporidia, 83. 



Sporocarp, 171, 172, 173, 174, 176, 177. 



Sporogouium, 95. 



Sporophores, 62. 



Sporophylls, 122. 



Sporophyte, 32 ; thallophytes, 32, 60, 84 ; 

 bryophytes, 92, 95, 07, 99, 100, 101, 103, 

 104, 105, 108, 109, 113, 114, 115, 116, 118, 

 IIQ, 120; pteridophytes, 122, 132, 138, 

 143, 149, 156, 171, 176 ; gymnosperms, 181, 

 185, 191, 203, 207, 213, 220, 229. 



Spirogyra, 39. 



Sprout chains, yeast, 7.0, 71. 



Squirting fungus, 68. 



Stalk cell, 200. 



Stamens, 183, 184, 186, 187, 195, 205, 208, 



213, 214, 220, 221, 230, 231, 252, 253, 256, 



257. 



Staminodia, 281. 



Starch, 358, 375, 389. 



Starch grain, 389. 



Statolith theory, 464. 



Stegocarpae, 121. 



Stele, 124, 239, 241. 



Stem, angiosperms, 239. 



Stemonitis, 3. 



Sterigmata, 80, 89. 



Stigeoclonium, 26. 



Stigma, 260. 



Stigmatomyces, 78. 



Stigonema, 10. 



Stimulus, 426 ; chemical, 438 ; formative, 



435 ; mechanical, 439 ; morphogenic, 435 ; 



tonic, 449. 

 Stink horns, 91. 

 Stipe, mushroom, 87. 

 Stomata, 109, 146, 250, 251, 319, 320, 327 ; 



regulation of, 327. 

 Stomium, 164. 

 Stone worts, 41. 

 Storage, 388. 



Straightening, twiners, 469. 

 Strains, sexual, 68. 

 Streaming, 444, 451. 

 Strobilus, 122 ; pteridophytes, 124, 132, 133, 



144; gymnosperms, 186, 187, 188, 189, 



192, 193, 195, 196, 204, 205, 206, 208, 209, 



213, 214, 22O, 221, 222, 228 t 229, 230, 231, 



232; theory of, 123. 



Stroma, chloroplasts, 367 ; fungi, 76, 77. 

 Style, 260. 



Substratum, fungi, 61. 

 Sugar, 390; cane, 359; fruit, 359; grape, 



359- 



Sulfur, source of, 379. 

 Summation, 432, 462. 

 Sundew, 387, 454. 

 Sunflower, nutation, 424. 

 Suspensor, angiosperms, 271, 272, 273, 274; 



