INDEX AND GLOSSARY 



693 



Sclerotic cells, with thick woody 



walls, of Hakea, 77 (Fig. 53). 

 Sclcrotinia, varying virulence of, 395, 



397- 

 Scots Pine (or Scotch Fir), ecto- 



trophic mycorrhiza of, 228 ; char- 

 acters of, Chap, xxxiii. 



Screw Pine, stem of, 67, 603. 



Scrophularia, vascular strand of, 44 

 (Fig. 23), 46 (Fig. 24) ; abortion of 

 fifth stamen, 268 (Fig. 192) ; 

 flower of, 643 (Fig. 494). 



Scrophulariaceae, meiomery in, 268 

 (Figs. 192, 193) ; flower of, 643 

 (Figs. 494. 495)- 



Scurvy, a deficiency disease, 662. 



Scutellum, suctorial organ of grass- 

 embryo, 658 (Fig. 503). 



Sea Buckthorn, root-nodules, 239. 



Season, biology of, 194. 



Seaweeds, Brown, 378 ; Red, 388. 



Secale (Rye), analysis of, 660 ; origin 

 of, 661. 



Secondary growth, by activity of 

 cambium, 55 (Figs. 34-37) ; of 

 root, 91 (Figs. 66, 67). 



Sedge (Carex), stems of, 191 (Fig. 

 127) ; leaf arrangement of, 207 ; 

 flowers of, 615 (Fig. 463). 



Seed, the result of maturing of a 

 megasporangium or ovule, de- 

 tached at ripeness, having an 

 embryo within : 5, 256, 311, 521; 

 viability of, 140 ; structure of, 310 ; 

 dispersal of, Chap. xix. ; reduc- 

 tion in number of, 322 ; increase 

 in number, 322 ; of Neottia, 233 

 (Fig. 161) ; w T inged of Bignoniaceae, 

 326 (Fig. 248) ; 353 a. 



Seed-coat, the covering of the seed 

 developed from the integuments, 

 6, 318 (Fig. 237) ; of Coniferae, 538 

 (Fig. 426). 



Seed-habit, origin of, 521, 550. 



Seed-leaves, the first leaves or coty- 

 ledons formed on an embryo, 7. 



Seed Plants, 2, 5. 



Segregation, theory of, 278. 



Segregation of chromosomes in tetrad- 

 division, 566 (Fig. 430), 563 (Fig. 

 430, B) ; Mendelian, 571 ; of genes, 

 572 (Fig. 436) ; in hybrids, 574. 



Selaginella, Chap, xxxii. ; ligule of, 

 512 ; rhizophores of, 513 (Fig. 405); 

 sporangia of, 516 (Figs. 406-410) ; 

 heterospory in, 512 ; embryology 

 of, 518 (Figs. 412, 413). 



Semi-permeable membrane, 35. 



Semolina, granules of endosperm 

 of wheat, sifted out in milling, 660. 



Senecio, chromoplasts in petal of, 

 (Fig. 200) ; flower of, 649. 



Sensitive filaments of Centaurea, 651 

 (Fig. 501). 



Sensitive plant (Mimosa), movements 

 of, 163 (Fig. 98). 



Sepals, the outermost series of floral 

 parts, constituting the calyx, 255 ; 

 structure of, 280. 



Septate structure, of plants, 173, 

 (Fig. 107). 



Sequoia, Big Tree of California 

 (Frontispiece), 527 ; conical stem 

 of, 590. 



Sera, 453. 



Seta, stalk of the capsule in Mosses, 

 461 (Figs. 355, 364), 469. 



Sex, Chap. xxxv. ; functions of, 531. 



Sex-difference, reflected back to 

 sporophyte, 555. 



Sexual act, polyphyletic, 556. 



Sexual-differentiation, in Algae, 370 

 (Fig. 275), 381. 



Sexual fusion, 307, 308, 382, 386. 



Sexual organs, 353 ; of Ferns, 501 

 (Figs. 393, 394) ; of Mosses, 467 

 (Figs. 362, 363) ; of Fucus, 384 

 (Figs. 287, 288) ; of Fungi, 398 

 (Fig. 296), 410 (Fig. 310) ; of 

 Ascomycetes, 421 (Fig. 319). 



Sexual reproduction, significance of, 

 558 ; its difference from vegetative 

 propagation, 245. 



Sheep Sorrel (Rumex acetosella), 112. 



Shelf Fungi, parasitism of, 393, 431, 

 442 (Fig. 340). 



Shepherd's Purse (Capsella), curved 

 ovule of, 319 (Fig. 239). 



Shoot, a morphological unit, made 

 up of a stem bearing leaves later- 

 ally, and in acropetal succession, 7 ; 

 shoot-system, 8 ; zones of growth 

 of, 143 (Fig. 88) ; symmetry of, 

 199 ; multiplication of, 347 ; gen- 

 eral purposes, 347 ; axillary and 

 distal branching of, 347, 348. 



Short-day type, 152. 



Sibbaldia, floral diagram of, 267 (Fig. 

 191). 



Sicyos, tendril of, 216 (Fig. 145). 



Sieve-plate, the perforated area of 

 wall of a sieve-tube, 48, 49 (Figs. 



25-27)- 

 Sieve-tubes, conducting tubes of the 



phloem : 44 (Figs. 23, 24) ; 48 

 (Figs. 25-27) ; 56 (Fig. 34) ; trans- 

 location by, 132 ; of Conifers, 532 

 (Fig. 419) ; of Ferns, 488 (Figs. 



377- 378)- 

 Sigillaria, 511. 



