786 
Spermatophyta, 14, 443 
Spermatophytes, 14, 15, 443 
Spermatozoid of fern, 68 
Spermoderm, 312 
Sperms, 16 
Sphagnacee, 425 
Sphagnales, 425 
Sphagnum, 425 
acutifolium, 424 
palustre, 425 
squarrosum, 424 
Spharella, 338 
Spicebush, 523 
Family, 522 
Spiderwort, 36, 40 
Spigelia, 583, 585 
Spigelia marilandica, 584, 585 
Spike, 259 
Spikelet, diagram of typical, 484 
Spikelets, 259, 484 
Spikenard, 575 
Spinach, 514 
Spine, defined, 189 
Spirea, 535 
Spireme, 47 
Spirilla, types of, 371 
Spirillacea, 372 
Spirillum, 365, 372 
Spirochzta, 348 
Spirogyra, 343, 344 
Spirosoma, 372 
Spirulina, 335 
Spondiea, 552 
Spongy parenchyma, 117, 223 
Sporangiophores, 377 
Sporangium, 67, 353, 377, 379 
Spore, 68 
bacterial, 368, 369 
brand, 398 
daughter-cells, 280 
germination of, 346 
mother-cells, 67, 280, 447, 457 
print, 405 
swarm, 375 
Sporogonium, 428 
Sporophore, 402, 404, 406 
Sporophyll, 433 
Sporophyte, 53, 418, 431 
Sporulation, 368 
INDEX 
Spring Beauty, 514 
Spruce, 211, 465 
Spruce Gum, 466 
Spur shoot, 446 
Spurge Family, 550 
Spurs, sepaline, 268 
Squash, 188 
Squill, 192, 490 
St. John’s Wort, 277 
St. John’s Wort Family, 564 
Staff Tree Family, 552 
Stain, 
Delafield’s hamatoxylin, 701 
Fast Green, 682 
Gentian violet, 683 
Heidenhain’s hamatoxylin, 683 
Ruthenium Red and Lead Acetate, 
686 
Safranin, 686 
Staining, 688 
double, 688, 689, 690, 691 
of celloidin sections, 701 
of material in paraffin ribbons, 699 
Stains, 680 
Stamen System, 274 
Figs. of, 276 
Stamens, color of, 277 
