MORPHOLOGY, ANATOMY, AXD PHYSIOLOGY. 



589 



Heterochlatnydeous, 457. 

 Heteroclinous, 335. 

 Heterocyclic, 449. 

 Heterocyst, 245 (Figs 135, 136). 

 Heteroecism, 299. 

 Heterogamy, 58, 241, 277. 

 Heteromerous lichen-thallus, 306. 



floral whorls, 449. 

 Heterophylly, 41, 

 Heterosporous, 51, 349, 394. 

 Heterostylism, 411. 

 Hilum, 79, 399. 



Histological differentiation, 65. 

 Histology, 63. 



of Gymnospermae, 419. 



of Phanerogamia, 400. 



of Pteridophyta, 365, 377, 383, 

 387, 391. 



of the development of secondary 



members, 132. 

 Homochlamydeous, 457. 

 Homoiomerous lichen-thallus, 306. 

 Homospprous, 51, 349, 380. 

 Hook-climbers, 171. 

 Hormogonium, 244 (Fig. 136). 

 Humus, 190. 

 Hybrid, 232. 

 Hybridisation, 232. 

 Hydrogen, 186, 188, 190. 

 Hydrotropism, positive, 169. 

 Hy menial layer, 293. 302. 

 Hymenophore, 302 (Fig. 183). 

 Hymenium, 302 (Fig. 183). 

 Hypha, 275. 



Hypobasal cell, 314, 346. 

 Hypocotyl, 404. 

 Hypoderma, 111. 

 Hypogean cotyledons, 405. 

 Hypogynous, 444 (Fig. 261). 

 Hyponasty, 211. 



Hypophysis, 403 (Figs. 238, 239). 

 Hypopodium, 29, 30. 

 Hypsophyllary leaves, 55, 57 (Fig. 

 27), 175. 



Ice, formation of, 161 (Fig. 122). 



Imparipinnate, 35 (Fig. 23). 



Incubous leaves, 326 (Fig. 202). 



Incumbent, 536. 



Indefinite inflorescences, 439. 



Indehisceut fruits, 473, 475. 



Induced movements, 211. 



Indusium, 348, 361. 



Inferior ovary, 444 (Fig. 261). 



Inflorescence, 54, 394, 439. 



Infundibuliform, 458. 



Initial cells, 101. 



Innate, 460. 



Innovation, 23, 333. 



Insertion-of leaves, 11. 



Integument, 415. 



Intercalary growth, 239 (Fig. 138). 

 Intercellular spaces, 89 (Fig. 67). 

 Interfascicular cambium, 138. 



conjunctive tissue, 118, 120. 

 Internal hairs, 92. 

 Internode, 11, 261. 

 Interruptedly pinnate, 85. 

 Intine, 50, 897. 



Intra-seminal development, 401. 

 Introrse, 464. 

 Inulin, 83 (Fig. 59), 187. 

 Invert-enzyme, 198. 

 Involucel, 440. 

 Involucral leaves, 384. 

 Involucre, 57, 810, 334, 440 (Fig. 



259), 579 (Fig. 397). 

 Iodine, 189. 

 Iron, 188, 192. 

 Irregular spontaneous variations in 



rate of growth, 209. 

 Irritability, 158. 



conditions of, 223. 

 localisation of, 220. 

 to differences in the degree of 

 moisture in the surrounding 

 medium (hydrotropism), 169, 

 219. 



to direction of incidence of the 

 rays of light (heliotropism), 

 169,171,214. . 

 to mechanical stimuli, 211. 

 to the directive influence of 

 gravity (geotropism), 169, 171 , 

 217 (Fig. 182). 

 to variations in the intensity 



of light, 213. 

 to variations of temperature, 



212. 

 Isobilateral arrangement, 17. 



symmetry, 4, 6 (Fig. 2fl), 454. 

 Isocyclic, 449. 

 Isogamy, 58, 240, 277. 

 Isomerous, 449. 



Juga primaria, 548. 

 Juga secundaria, 549. 



Kinetic energy, 194, 197. 

 Knight's machine, 218. 



Labellum, 418 (Fig. 244), 503 (Fig. 



814). 



Lsevulose, 198. 

 Lamella, 302 (Fig. 183). 

 Lamina, 29, 32. 

 Lanceolate, 87. 

 Lateral branching, 19. 



buds, 11. 



members, development of, 9, 182. 



