INDEX AND GLOSSARY 



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Gynoecium, applied collectively to 

 all the carpels of a single flower, 



255- 



Haematococcus (see Sphaerella), 



3°3- 



Haemoglobin, in root-nodules, 239. 



Hairs, appendages of the epidermis, 

 12 ; effective in seed dispersal, 

 325 (Fig. 245), 351. 



Hairiness, 210. 



Hakea, stoma of, 77 (Fig. 53) ; 

 sclereids in leaf of, 177 (Fig. in) ; 

 xerophytic leaf of, 210. 



Halimeda, matted and cemented 

 filaments of, 173, 369. 



Halophytes, 113, 211. 



Haplobiontic Algae, 546, 556. 



Haploid, having tihe simple number 

 (x) of chromosomes in each nucleus, 

 as in the gametophyte generation, 

 299 ; in Algae, 375 ; in Ferns, 506 ; 

 in Ascomycetes, 424 ; in Puccinia, 



437- 

 Haptotropism, 160. 



Hardening of plants, 148. 



Harveyeila, parasitism of, 389 (Fig. 



291), 392. 

 Haustoria in ovules of Rhinanthus, 



316 (Fig. 235) : of mildews, 419 



(Fig. 317). 

 Hay-bacillus, 448 (Fig. 346). 

 Hazel nut, analysis of, 657. 

 Heart- wood, 64. 

 Heat, evolution of, 137. 

 Heath (Erica), curled leaves of, 106, 



211 ; endotrophic mycorrhiza of, 



230, 231 (Fig. 158) ; flowers of, 



639 (Fig. 49i)- 

 Heather (Calluna), 113 ; endotrophic 



mycorrhiza of, 231 (Fig. 158). 

 Helianthus (Sunflower), root-cap of, 



156 (Fig. 95) ; development of 



flower of, 273 (Fig. 198) ; double 



fertilisation of, 306 (Fig. 227). 

 Heliotropism, response to stimulus of 



light, 158 (Fig. 96) ; diaphoto- 



tropic, 159. 

 Helleboreae, follicles of, 322 (Fig. 240). 

 Helleborus, floral diagram of, 264 



(Fig. 189), 624. 

 Hemerocallis, 608. 

 Hemicyclic, arrangement of parts of 



flower, 264 (Fig. 189). 

 Hemp, fibres of, 177. 

 Hems, of sclerotic tissue at leaf 



margins, 190 (Fig. 125). 

 Hepaticae (Liverworts), 3, 460, 472 ; 



archegonia of, 474. 



Heracleum (Cow Parsnip), 637 (Fig. 



490). 

 Herbaceous Dicotyledons, stem of, 



42. 

 Heredity (Chap, xxxv.) ; mechanism 



of, 341. 

 Hermaphrodite, where male and 



female organs are on the same 



individual : applied to flowers 



when they contain both stamens 



and carpels, 256, 301. 

 Heterocysts, of certain Cyano- 



phyceae, 376. 

 Heteroecism, where the life-cycle of a 



parasite is completed by stages on 



distinct hosts, 432. 

 Heteromorphic alternation, 390. 

 Heterosporous, applied to vascular 



plants in which there are distinct 



magaspores and microspores, 352 ; 



a derivative state, 517 ; adoption 



by Pteridophytes and seed-plants, 



539, 553- 

 Heterothallic, in Mucorales, where 



zygospores are only produced on 

 meeting of branches of two differ- 

 ent mycelia, 416 (Fig. 315) ; in 

 Rusts, 439. 



Heterotrophic, applied to nutrition 

 by some accessory or irregular 

 method, in addition to or even 

 superseding self-nutrition, 220 

 (Chap. xii.). 



Heterotype division, another name 

 for meiosis : conveying the fact 

 that the resulting nuclei are of a 

 type different from their pre- 

 decessors, 565 (Fig. 430). 



Heterozygote, formed by union of 

 two genetically dissimilar gametes, 



572. 

 Hieracium, somatic parthenogenesis 



in, 587. 

 Higher animals and plants compared, 



555- 

 Hilum, scar of attachment of a seed 



to the parent plant, 6. 

 Himanthalia, 386. 

 Hip, of Rose, a succulent hollow 



receptacle, 329. 

 Hippuris, Mare's tail, 16, 17 (Figs. 



7, 8), 43, 47- 



Hofmeistenan Cycle, 353, 390, 545. 



Holdfast, 378. 



Holly, indurated leaf -margin of, 190. 



Homodynamy, 345. 



Homogeny, in parts genetically re- 

 lated by having a single repre- 

 sentation in a common ancestor, 



345- 



