INDEX AND GLOSSARY 



575 



Sieve-tubes, conducting tubes of the 

 phloem : 38 (Fig. 24) ; 39 (Figs. 

 25-28) ; 41, 50 (Fig. 37) ; of 

 Conifers, 306 (Fig. 249), of Ferns, 

 332 (Figs. 270, 272). 



Siliqua, the fruit of Cruciferae, 513 

 (Fig. 419). 



Silver grain, radial aspect of medul- 

 lary rays, 51. 



Silver wire, qualities of, 146. 



Sinistrorse twining, reverse of hands 

 of watch, 182. 



Siphonales, non-septate Algae, 139 

 (Fig. 98), 394 ; vegetative propa- 

 gation of, 395 ; gametes of, 397. 



Siphonocladiales, 394. 



Sisyrinchium, 497. 



Size, limit of, 154. 



Snowdrop, 492, 495. 



Snowflake, 495. 



Soja Bean (Dolichos soja), analysis 

 of, 542 ; origin of, 543. 



Solanaceae, 528 (Fig. 435). 



Solanum : jasminoides, prehensile leaf 

 of, 183 ; porous dehiscence of 

 anthers of, 245 ; tuberosum 

 (Potato), 'seedling of, 211 (Fig. 

 I 59) '> correlation in, 185 (Fig. 

 138) ; origin of, 540 ; analysis of 

 tubers, 541 ; flower of, 529 (Fig. 



435). 



Somatic budding, separation of buds 

 from the soma or plant-body, 215. 



Somatic-division of nucleus, 464 

 (Fig. 392), 469 (Fig. 349, A] ; of 

 cells, 19, 20 (Fig. n). 



Somatic parthenogenesis, where an 

 embryo is formed without fertilisa- 

 tion from a diploid egg, 477, 478. 



Soredia, organs of vegetative propa- 

 gation of Lichens, 439. 



Sori of Ferns, 327 (Fig. 266), 337 (Fig. 

 278). 



Specific mechanical tissues, 143 ; 

 physical qualities of, 146, 147 ; 

 disposition of, 148. 



Spermatium, a naked non-motile 

 male gamete ; of Red Seaweed, 

 388 (Fig. 327), 440 ; of Puccinia, 

 448. 



Sperrnatocytes, cells giving rise to 

 spermatozoids : of Selaginella, 321 

 (Fig. 264) ; of Ferns, 342 (Fig. 

 284). 



Spermatozoids, motile male fertilising 

 bodies : of Zamia, 315 (Fig. 257) ; 

 of Selaginella, 321 (Figs. 264, 265) ; 



of Ferns, 342 (Fig. 284), 345 (Fig. 

 286) ; of Mosses, 360 (Fig. 303), 

 362 ; of Liverworts, 367 ; of 

 Brown Seaweeds, 379, 381 ; of 

 Fucus, 385 (Fig. 325) ; of Oedo- 

 gonium, 394, 331 ; of Mono- 

 blepharis, 422 (Fig. 358). 



Spermogonia, flask-shaped bodies con- 

 taining spermatia : in Lichens, 440 ; 

 in Puccinia, 443 (Fig. 383), 448. 



Sphaerotheca, 429, 431 (Figs. 364, 



365). 



Sphagnum (Bog Moss), 358. 

 Spike, an indefinite inflorescence with 



sessile flowers, 225 (Fig. 172). 

 Spikelet, of Glumales, 501 (Fig. 404), 



502, 503 (Fig. 406). 

 Spinach (Spinacia oleracea), analysis 



of, 541 ; origin of, 542. 

 Spindle-fibres, in dividing nucleus, 



465 (Figs. 392, 393). 

 Spindle-Tree (Euonymus), arillus of, 



283. 

 Spiral arrangement, of leaves, where 



an ascending spiral line may be 



drawn round the stem, threading 



together the bases of them all, 169 ; 



of parts of flower, 230 (Fig. 179). 

 Spireme-state, in the division of the 



nucleus where the chromosomes are 



disengaged, 470. 

 Spirillum, strongly spiral shape of 



Bacteria, 458. 



Spirogyra, 104, 398 (Fig. 337). conju- 

 gation of, 461, 462. 

 Splachnum, habitat of, 356. 

 Spongy-parenchyma, 61 (Fig. 44), 62 



(Fig. 45), 64 (Fig. 46), 67. 

 Sporangiophores, hyphae bearing 



sporangia, of Mucor, 423 (Fig. 359)- 

 Sporangium, an organ of propagation 



producing spores internally, 222 ; 



of Fern, mechanism of, 133 (Fig. 



95), 337 (Figs. 278, 281); of 



Selaginella, 319 (Figs. 260, 261) ; 



of Brown-Algae, unilocular, 380 



(Fig. 320, A] ; plurolocular, 380 



(Fig. 320, B) ; of Mucor, 424 (Fig. 



359), 360. 

 Spores, of Selaginella, 320 ; of Ferns, 



336, 339 (Figs. 280, 281) ; in 



Mosses, germination of, 355 > 



origin of, 363, 364; of Bacteria, 



458. 

 Spore-mother-cell, of Ferns, 339 (Fig- 



280) ; tetrad-division of, 466 (Fig. 



393)- 



