LNDEX AND GLOSSARY 



^6i 



Glumales, 492, 500. 



Glumes, 500, 503 (Fig. 406). 



Gluten, 547. 



Glycogen, reserve carbohydrate of 

 Fungi, 405. 



Goat Willow (Salix), 505. 



Gonidial layer, the stratum in a 

 Lichen thallus where the green cells 

 lie, 439 (Fig. 373). 



Gooseberry, 517 ; analysis of, 544. 



Gorse, seeds transferred by ants, 294. 



Graft-hybrid, the reputed result of 

 complete fusion of tissues of graft 

 and stock, so that the characters of 

 both are mingled, 218. 



Grafting, 216 (Figs. 165, i66). 



Gramineae, 492, 503 (Fig. 406). 



Grape (Vitis vinifera), origin of, 543 ; 

 analysis of, 544. 



Grape-Hyacinth (Muscari), 495. 



Grasses, sensitive cotyledon of, 125 ; 

 haulm of, 150, 153 (Fig. 113) ; 

 leaf-arrangement, 171 ; embryo of, 

 278 ; flower of, 503 (Fig. 406). 



Grass-leaves, curling under drought, 

 133, 155 (Fig. 115)- 



Gravity, effect of, 8 ; stimulus of, 

 124 ; reception of stimulus by, 125. 



Green peas, analysis of, 542. 



Grimmia, gemmae of, 359. 



Groundsel, 535. 



Ground-tissue, 33, 35. 



Growing-point, the tip of the stem 

 or leaf or root, where new tissues 

 are being produced, 16 (Figs. 7, 

 8, 10). 



Growth, increase in bulk with re- 

 distribution of organic material, 

 5, 7 ; annual increment of, 13 

 (Fig. 6) ; (Chap. viii. p. 118) ; 

 conditions of, 119; rapidity of, 



121 ; effect of temperature upon, 



122 ; effect of light upon, 122 ; 

 of cell, 120 ; localisation of, 76 

 (Fig. 59). 



Guard-cells, the cells that control 



the pore of a stoma, 62 (Fig. 45) ; 



64 (Fig. 46) ; 65 (Figs. 47, 48). 

 Gummy walls, of mucilaginous 



character, 28. 

 Gussets, of mechanical tissue in 



leaves, 157 (Figs. 117, 118). 

 Gymnocladus, testa and endosperm 



of, 282 (Fig. 224). 

 Gymnosperms, seed-plants with their 



ovules exposed, such as the Pines 



and Firs, 3, 302 (Chap. xix). 



Gymnosporangium, 422. 

 Gynoecium, applied collectively to 

 all the carpels of a single flower, 



Hairs, appendages of the epidermis, 



12 ; effective in seed dispersal, 



289 (Figs. 232-236). 

 Hakea, stoma of, 66 (Fig. 50) ; 



sclerids in leaf of, 144 (Fig. 104) ; 



xerophytic leaf of, 177. 

 j Halimeda, matted and cemented 

 j filaments of, 141, 395. 

 I Haploid, having the simple number 



(x) of chromosomes in each nucleus, 



as in the gametophyte, 251 ; 



generation in Ferns, 348 ; in 



Ascomycetes, 435 ; in Puccinia. 



448. 

 Harveyella, parasitism of, 403 (Fig. 

 I 339). 

 Haustoria in ovules of Rhinanthus, 



280 (Fig. 222) ; of mildews, 431 



(Fig. 363). 

 Hay-Bacillus, 458 (Fig. 391). 

 Hazel, as host for Toothwort, 193 



(Fig. 144) ; Hazel nut, analysis 



of, 544- 

 Heart-wood, 53. 

 Heath (Erica), curled leaves of, 96; 



endotrophic mycorhiza of, 197 ; 



obligatory, 198 (Fig. 149) ; flowers 



of, 525 (Fig. 433). 

 Heather (Calluna), endotrophic my- 

 corhiza of, 198 (Fig. 149). 

 HeUanthus (Sunflower), root-cap of, 



126 (Fig. 87 bis.) ; development 

 of flower of, 238 (Fig. 188) ; double 

 fertilisation of, 270 (Fig. 214 tris). 



Heliotropism, response to stimulus of 

 light, 127 ; positive and negative, 



127 (Fig. 88) ; transverse, 127. 

 Helleboreae. follicles of, 285 (Fig. 



227). 

 Helleborus, floral diagram of, 230 



(Fig. 180) ; 511. 

 Hemerocallis, 495. 

 Hemicyclic, arrangement of parts 



of flower, 230 (Fig. 180). 

 Hemp, fibres of, 145. 

 Hems, of sclerotic tissue at leaf 



margins, 157 (Fig. ri8). 

 Hepaticae (Liverworts), 3 ; 353 ; 



365-370 ; sexual organs of, 366. 

 Heracleum (Cow Parsnip). 534 (Fig. 



432)- 



