562 



BOTANY OF THE LIVING PLANT 



Herbaceous Dicotyledons, 'stem of, 35. 



Hereditary transmission, a conse- 

 quence of sex, 462. 



Heredity, 461 (Chap. xxxi.). 



Hermaphrodite, where male and 

 female organs are on the same 

 individual : applied to flowers 

 when they contain both stamens 

 and carpels, 222, 265. 



Heterocysts. of certain Cyanophyceae, j 



457- 



Heteroecism, where the life-cycle | 

 of a parasite is completed by j 

 stages on distinct hosts, 422. 



Heterosporous, applied to vascular j 

 plants in 'which there are distinct 

 megaspores and microspores, 325, 

 351 ; a derivative state, 486 ; 

 adoption by Pteridophytes and j 

 seed-plants, 489. 



Heterothallic, in Mucorini, where I 

 zygospores are only produced on j 

 meeting of branches of two differ- i 

 ent mycelia, 426 (Fig. 361). 



Heterotrophic, applied to nutrition 

 by some accessory or irregular | 

 method, in addition to, or even 

 superseding self -nutrition, 187 

 (Chap. xi.). 



Hete retype division, another name ! 

 for Reduction-division : conveying I 

 the fact that the resulting nuclei \ 

 are of a type different from their j 

 predecessors, 468, 469. 



Heterozygote, formed by union of i 

 two dissimilar gametes, 475, 476. 



Hieracium, somatic parthenogenesis ; 

 in, 477. 



Hilum, scar of 'attachment of a seed , 

 to the parent plant. 6. 



Himanthalia 385. 



Hip, of Rose, a succulent hollow 

 receptacle, 293. 



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

 7, 8), 36, 40- 



Hofmann's apparatus, 103 (Fig. 76). j 



Holly, indurated leaf -margin of, 158. 



Homologous alternation, 479, 481. 



Homoplastic development, 160. 



Homoplasy, where similar morpho- 

 logical results are produced by 

 adaptation in two or more distinct 

 evolutionary lines : of parasites, j 

 193; in Algae, 401. 



Homosporous, applied to archegoni- ; 

 ate plants in which there is only ! 

 one type of spore, 325, 351 ; a 



primitive state, 485, 487 ; fully 



exploited in Pteridophytes, 489. 

 Homothallic. in Mucorini, where 



zygospores are produced on meet- 

 ing of two branches of the same 



mycelium, 426. 



Homotype-division, the second divi- 

 sion in the spore-tetrad, carried 



out like any somatic division, 



466, 469. 

 Homozygote, formed by union of 



two gametes similar in respect of a 



given character, or characters, 



475 (Fig. 396). 

 " Honey Dew," 406 (Fig. 341) ; 436 



(Fig. 369). 

 Honey Agaric, parasitism of, 404 



(Fig. 340) ; 411 (Fig. 347). 

 Hooks, in seed dispersal, 292 (Fig. 



238). 



Hop, twining stem of, 182. 

 Hop-mildew (Sphaerotheca), 431. 

 Hordeum (Barley) analysis of, 547 ; 



origin of, 548. 

 Horse-chestnut (Aesculus), 13 (Fig. 6); 



69 (Fig. 52). 

 Horse-tail, vegetative propagation of, 



218, 316. 

 Host, a plant or animal that supplies 



food to a parasite, 187. 

 Hottonia, 101. 

 Humble-bee, agent for pollination of 



Aconite, 266. 



Humus, leaf-mould, decaying vege- 

 table matter of the soil, 188. 

 Hura (Sand-box Tree) , explosive fruit 



of, 133 (Fig. 94) ; dehiscence of 



fruit, 287, 516. 

 Hyacinth, qualities of fibres of, 146 ; 



perennation of, 165 (Fig. 125). 

 Hybridisation, the result of crossing 



of more or less dissimilar parents, 



470. 

 Hydrom, water- conducting tissue of 



Mosses, 357 (Fig. 299), 370. 

 Hydrophytes, plants adapted to life 



in presence of plentiful water, 175, 



178. 

 Hydrotropism, response to stimulus 



of unequal water-supply, 128 ; 



positive, of pollen-tubes, 268. 

 Hygroscopic movements, due to 



changes in degree of moisture, 



r 33 (Fig 8 - 93, 94> 95) ' o f seeds and 



fruits, 297. 

 Hymenial gonidia, Algal cells in the_ 



hymenium of a Lichen, 440. 



