INDEX AND GLOSSARY 



563 



Hymenium, the larger bearing asci 

 or basidia, in Fungi or Lichens, 

 440; of Hymenomycetes, 451 

 (Fig. 387) ; of Mushroom, 453. 



Hymenomycetes, 451. 



Hypha, the fungal filament. 404 ; 

 non-septate, 410 ; septate, 410 ; 

 traversing tissue of host, 407 

 (Fig. 342), 419 (Fig. 354). 



Hypobasal tier, the part of an 

 embryo lying below the basal wall : 

 in Ferns, 346. 



Hypocotyl, region of stem below the 

 Cotyledons, n (Fig. 4), 49 (Fig. 36). 



Hypoderma, tissue below the epider- 

 mis, often mechanically strength- 

 ened, 63. 



Hypodermal cells, those lying below 

 the epidermis, 249. 



Hypogynous, of flowers, with stamens 

 and other outer parts seated below 

 the gynoecium, 237 (Fig. 185). 



Hypophysis, cell giving rise to the 

 root-tip in the embryo of Dicoty- 

 ledons, 275 (Fig. 217). 



Iceland Moss (Cetraria), 439. 



Imbibition, water of, 84. 



Immune varieties, of Potato, 419 ; of 

 Wheat, 449. 



Immunity, where two organisms may 

 be in relation, but neither has 

 power against the other, 203. 



Inarching, or approach-grafting, 217 

 (Fig. 1 66). 



Indusium, of Ferns, 337 (Fig. 278). 



Inferior, applied to the ovary when 

 sunk below the level of the other 

 floral parts, 254 (Figs. 187, 188). 



Inflorescence, a common branch- 

 system bearing a number of flowers, 

 220 (Chap, xiii.) ; 223 ; definite 

 or cymose inflorescence, 224 (Fig. 

 170) ; indefinite or racemose, 224 

 (Fig. 170), 225 ; radial and dorsi- 

 ventral, 228. 



Integuments, the coverings investing 

 the nucellus of an ovule, 258 (Figs. 

 206, 207). 



Intercellular spaces, 36, 62 (Fig. 45), 

 63 (Fig- 46), 64 (Fig. 47), 70. 



Interchange of gases, in photo- 

 s'yii thesis and respiration, 115. 



Interpolation of plants, where extra 

 primordia appear in spaces norm- 

 ally unoccupied, 232. 



Inulase, the ferment converting inulin 



into sugar, 112. 



Inulin, storage of in Dahlia, 109. 

 Invertase, an enzyme which converts 



cane sugar into invert-sugar, 112. 

 Involucre, a group of protective 



bracts, 226 (Fig. 175), 227 ; 534 



(Fig. 440), 538 (Fig. 444). 

 Iridaceae, 492, 496. 

 Iris, perennial stock of, 164 (Fig. 



122) ; leaf arrangement of, 171 ; 



dehiscence of anthers, 245 (Fig. 



191) ; flower of, 492, 496 (Fig. 400). 

 Iron, importance of, 94. 

 Irregular nutrition, obtaining organic 



substance by some other process 



than by photo-synthesis, 187 (Chap, 



xi.) ; secondary in Flowering Plants. 



210; in Thallophytes, 372. 

 Irregular propagation, 477. 

 Irritability, power of reaction to 



stimulus, 124 ; referable to the 



living protoplast, 128. 

 Isoetes lacustris, 317. 

 Isogametes, sexual cells of equal size, 



461 ; of Brown Seaweeds, 379. 

 Ivy, skeleton of lamina, 60 (Fig. 43) : 



climbing shoots negatively helio- 



tropic, 127; adhesive roots, 183. 



Juncaceae, 492, 500. 

 Juncus lamprocarpus. 501 (Fig. 403). 

 Jungermanniales, 365, 366 (Fig. 310). 

 Juniper, 302. 



Kidney Bean, 8 ; analysis of, 542. 



Klinostat, a clock-work arrange- 

 ment for slowly rotating a plant 

 under experiment, 125. 



Krakatau, new flora of, 295. 



Labellum, 499 (Fig. 402). 



Labiatae, 532 (Fig. 438) ; glandular 

 hairs of, 177. 



Laburnum, hard wood of, 53 ; zygo- 

 morphy of, 240 (Fig. 189). 



Lactuca scariola v. sativa (Lettuce), 

 percentage of water in, 84 ; analy- 

 sis of, 541 ; origin of, 542. 



Lamina, the leaf-blade, 58 ; struc- 

 ture of, 61 (Fig. 44), 62 (Fig. 45), 

 64 (Fig. 46) ; venation of, 156 

 (Fig. 1 1 6). 



Laminaria, 377, 378 (Fig. 317). 



