404 INDEX 
Scapania, 349 Sexual cells, 112 
Scenedesmus, 172, 332 reproduction, 109, 170, 171 
Scheuchzeriaceae, 357 Shade plants, 320 
Schistostegiaceae, 350 : Shield-Ferns, 259 
Schizaeaceae, 352 Shoot, 329 
Schizogoniales, 332 Side Mosses, 252, 351 
Schulze’s reagent, 35 Sieve tissue, 38 
Scirpus, 300, 358 Sigillaria, 269 
Sclerenchyma, 32 Sigillariaceae, 354 
Scleroderma, 345 Silene, 306, 364 
Sclerodermataceae, 345 Silicic acid, 140 
Sclerodermatales, 344 Silks (of maize), 298 
Scleroderris, 341 Silphium, 375 
Sclerotinia, 342 Simarubaceae, 363 
Scotch Pine, 279 Simblum, 345 
Scouring-Rush, 264 Simple Algae, 170, 332 
Scrophularia, 367 pistils, 286 
Scrophulariaceae, 367 Sinapis, 364 
Scrophulariales, 367 Siphonales, 334 
Scytonema, 165, 331 Siphonophyceae, 184, 334 
Seytonemas, 165 Sirobasidiaceae, 346 
Scytonemataceae, 165, 331 Sisyrinchium, 360 
Scytopetalaceae, 362 Size of Cells, 7 
Sea Ferns, 192, 336 Skeletal tissue, 46 
Girdle, 201 Slime Algae, 163, 330 
Lettuces, 173 ‘$lit-Fungi, 218, 343 
Mosses, 338 -Lichens, 218, 342 
Palm, 201 Smuts, 347 
Tree, 201 Snapdragon, 304, 367 
Umbrellas, 192 Snowberry, 315 
Secondary leaves, 281 Snow-on-the-Mountain, 322 
thickening, 60 Soft Red Seaweeds, 339 
Secotium, 345 Solanaceae, 366 
Secretory cells, 66 Solanin, 148 
Sedges, 298, 358 Solanum, 366 
Seed, 271 Soleniaceae, 334 
distribution, 324 Solidago, 376 
-ferns, 272, 354 Solutes, 81 
scale, 278, 279 Solutions, 81 
Selaginella, 268, 354 Somatic cells, 112 
Selaginellaceae, 267 division, 112 
Selaginellales, 354 Sonneratiaceae, 369 
Self fertilization, 323 Sorbinose, 146 
Sematophyllaceae, 351 Sorbite, 142 
Senecio, 376 Sordariaceae, 343 
Sennas, 368 Sori, 232 
Sepals, 286 Spadix, 300 
Septoria, 239, 347 Spanish needles, 325 
Sequoia, 278, 356 Sparganiaceae, 357 
4 
Senecionidaceae, 376 Soredia, 215 
Seta, 250 Spathe, 296 
