6p6 



BOTANY OF THE LIVING PLANT 



Suberin, 124. 



Suberised walls, of corky character, 

 24. 



Substituted sexuality, 587. 



Subularia, perigynous flower of, 272. 



Succulence, in xerophytes, 209 (Fig. 

 141). 



Suckers, organs by which parasites 

 extract nourishment from the host, 

 225 (Figs. 151, 152), 226 (Fig. 153) ; 

 shoots which appear above ground, 

 formed as adventitious buds on 

 roots, 247. 



Sucrose (cane sugar), 123, 131. 



Suction, of water from above, 107. 



Suction pressure, 37. 



Sugar, 123 ; formed in photosyn- 

 thesis, 115 ; storage of, 124 ; de- 

 rived from starch, 129. 



Sugar-beet, 654. 



Sugar Maple, 108. 



Sulphur, necessary to form proteins, 

 127. 



Sulphur Bacteria, 451. 



Summer buds or spores (uredo- 

 spores), of Puccinia, 433 (Figs. 331- 



333)- 

 Sundew (Drosera), motile tentacles of, 



164 (Fig. 99) ; leaves of, 239 (Fig. 



166) ; digestion by, 240. 



Sunflower, germination of, 12 ; petiole 

 of, 70 (Fig. 45) ; transition of leaf 

 arrangement, 202 (Fig. 135) ; de- 

 velopment of epigynous flower of, 

 272 (Fig. 198). 



Sunken stomata, 210 (Fig. 142). 



Superficial placentation of ovules 

 inserted on the carpellary surface, 

 291. 



Surface-volume ratio, 591. 



Suspended animation, 334. 



Suspensor, the" part by which the em- 

 bryo is attached, 311 (Fig. 230), 313 

 (Fig. 232) ; of Selaginella, 518 (Figs. 



412, 413)- 

 Suspensor of Mucor, 416. 

 Sweet Chestnut (Castanea vesca), 



leaf of, 350 (Fig. 262). 

 Sweet Pea, seeds of, 140. 

 Swelling, increase of bulk by taking 



up water into organised substance, 



5- 

 Sycamore, deciduous leaves of, 194 ; 



leaf -mosaic, 201 (Fig. 134) ; de- 

 layed germination of, 140. 



Symbiosis, a mutual existence of 

 two organisms with joint physio- 

 logical action, 221 (Chap. xii.). 



Symmetry, the proportions of a shoot 

 or root resulting from equal or un- 



equal growth round the axis of con- 

 struction : of root, 199 ; of shoot, 

 200 ; of flower, 274 ; radial or 

 actinomorphic, where development 

 is equal all round, 200, 274 ; dorsi- 

 ventral or zygomorphic, where 

 there are distinct upper and lower 

 faces, 70, 205, 274 (Fig. 199) ; bi- 

 lateral, 205. 



Sympetalae, Dicotyledons with co- 

 herent petals (gametopetalous, 638. 



Sympodium, a false axis built up of 

 parts which are branches of suc- 

 cessively higher order, 207 (Fig. 



139). 

 Synandreae, 647. 



Syncarpous, applied to carpels when 

 united, 289 (Figs. 209, 211). 



Synergidae, two cells which, with the 



ovum, form the egg-apparatus, and 



co-operate with it in fertilisation, 



295 (Fig. 216), 305 (Fig. 226). 



yngamy, the fusion of gametes, 309, 



353. 544. 557. 567- 

 Synthesis, 114 (Chap, viii.) ; of pro- 

 teins, 126. 



Tamus, 50 ; embryo of, 314 (Fig. 233). 

 Tangles, large size and mechanical 



demands of, 168, 378, 380. 

 Tapetum, a layer of cells surrounding 



the spore-mother-cells in sporangia; 



of pollen-sac, 284 (Figs. 205, 206) ; 



of Fern sporangium, 497 (Fig. 



389, i-)- 

 Taraxacum (Dandelion), flower of, 



652 (Fig. 502) ; somatic partheno- 

 genesis in, 587. 



Targionia, structure of, 472 (Fig. 368). 



Taxodium, 529. 



Taxus (Yew), 527. 



Teleutospores (or winter spores or 

 buds), of Puccinia, 433 (Fig. 334) ; 

 germination of, 435 (Fig. 335). 



Telome, morphology of, 353 a. 



Temperature ; effect on germination, 

 8 ; suitable for growth, 31 ; effect 

 on growth, 147 ; on flowering, 152 ; 

 on movements in cell, 31. 



Tenacity, limit of, 179. 



Tendril, haptotropic, 161, 216 (Fig. 

 145), 219 (Fig. 148). 



Tensions of tissues, mutual, 1 74 (Fig. 

 108). 



Testa, the seed-coat developed from 

 the integument, 318 (Fig. 237) ; of 

 Wheat, 658 ; impermeability of, 

 140. 



Tetanus Bacillus, anaerobic, 450. 



