INDEX AND GLOSSARY 



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Elasticity, limit of, that is the degree 

 of elongation which a strand or 

 wire will sutler and recover its exact 

 length when the stress is removed, 

 178-179. 



Elements, of plant-food, no. 



Eligulatae, those Lycopods which 

 have no ligule, 512. 



Elm, vascular bundle of, 56 (Eig. 34) ; 

 cambium of, 57 (Fig. 36) ; bark of, 



65. 

 Elodea, Canadian weed, 16, 120 (Fig. 



80) ; vegetative propagation of, 



245- 

 Elymus, Lyme Grass, leaf-structure, 



187 (Fig. 121). 



Embryo, a new individual resulting 

 from syngamy, 6 ; immature, 140 ; 

 initiated by syngamy, 311 (Figs. 

 230, 232 ) ; of Pine, 537 (Fig. 425) ; 

 of Selaginella, 518 (Figs. 412, 413) ; 

 of Fern, 504 (Fig. 397). 



Embryo-sac, the large cell or mega- 

 spore enclosed in the nucellus in 

 Seed Plants, which contains the 

 ovum and other cells, 295 (Fig. 

 216) ; development of, 296 (Fig. 

 217), 298 (Fig. 219). 



Embryology, internal, of Land Plants, 



455. 559- 



Emergences, appendages of the epi- 

 dermis, together with subjacent 

 tissue, 12, 352. 



Empetrum, rolled leaf, 211. 



Empusa Muscae, 401, 413 ; explosive 

 dispersal of conidia of, 415. 



Encysted state, where a proto- 

 plast is surrounded by a cell-wall, 

 169 ; of Euglena (Fig. 104, D, 

 E). 



Endodermis, the layer of cells de- 

 limiting the stele (= phloeoterma), 

 42 (Fig. 22), 44 (Fig. 23), 46 (Fig. 

 24) ; in root, 84 (Figs. 58, 59) ; 

 function of, 109 ; in Fern, 484 

 (Figs. 377, 378) ; at apex of Ferns, 

 598-600. 



Endogenous origin, development of a 

 new part from deeply-seated tissue, 

 e.g. roots, 90 (Fig. 65). 



Endosperm, a nutritive tissue pro- 

 duced within the embryo-sac ; it 

 surrounds the embryo, and often 

 persists till the ripeness of the 

 seed, which is then described as 

 albuminous, 319 (Fig. 239) ; in 

 albuminous seeds, n (Fig. 4) ; 

 function of, 319 ; in wheat, 658 ; 

 analysis of, 660 ; of Coniferae, 535 

 (Fig. 423), 538 (Fig. 426). 



Endothecium, the central tract of 

 cells of the young Moss sporo- 

 gonium, 470 (Fig. 365). 



Endotrophic mycorrhiza, where the 

 fungus occupies the living cells of 

 the host, 230 (Figs. 159, 160). 



Energy and photosynthesis, 138. 



Energy of light-rays, 116 ; needed by 

 cell, 133 ; liberated by, 134 ; fix- 

 ation of, 138. 



Enlargement of cell, 141. 



Enteromorpha, 365. 



Entomophthorales, 413. 



Enzymes, 33, 128. 



Ephebe, 427. 



Epibasal hemisphere, the part of an 

 embryo lying above the basal wall : 

 in Ferns, 504. 



Epicalyx, 633 (Fig. 434, B)„ 



Epidemic, 396. 



Epidermis, 42 (Fig. 22), 46 (Fig. 24) ; 

 as seen in surface view of leaf, 75 

 (Fig. 49). 



Epigynous, of flowers, where the 

 gynoecium is sunk in the abbre- 

 viated receptacle, so that the ovary 

 appears to be below the other 

 floral parts, 272 (Figs. 197, 198), 

 277. 



Epilobium, symmetry of shoot, 200 

 (Fig. 133). 



Epiphytes, plants which live attached 

 to the branches or trunks of other 

 plants ; water-supply of, 211 ; 

 xerophytic features of, 209. 



Epi-rachis, 351. 



Epithelium, in style of Rhododen- 

 dron, 305 (Fig. 225). 



Equisetales, the Horsetails, 3, 522 

 (Fig. 413, A). 



Equisetum arvense, vegetative pro- 

 pagation of, 252 ; sporangiophores 

 of, 522. 



Ergosterol, 663. 



Ergot or Rye (Claviceps), 395 (Fig. 

 2 93). 397 i general account of, 425 

 (Fig. 323). 



Ericaceae, Heaths, mycorrhiza in, 

 230 ; flower of, 639 (Fig. 491). 



Eriophorum, 615 (Fig. 462). 



Ervum lens (Lentil), analysis of, 655 ; 

 origin of, 056. 



Erysiphe, description of, 419 ; haus- 

 toria of, 420 (Fig. 317). 



Erysiphales, 419. 



Essential elements, 112. 



Ethyl alcohol, 136. 



Etiolation, result of growth of a plant 

 in the absence of light, 146 (Fig. 91). 



Eucalyptus, vertical leaves of, 211. 



