528 



MANUAL OF BOTANY 



beiug separated by couj uuctive or 

 ground tissue 



Gamopetalous. Having the petals coher- 

 ing laterally (similarly gamosepalous) 



Gamostelic. The condition when the 

 steles of a polystelic stem are arranged 

 in a ring and more or less completely 

 fused together laterally 



Gemmce. Vegetative reproductive struc- 

 tures found among the Tliallophyta 

 and Bryophyta, 38, 65, 104, 110, 117 



Genera, 4 



Genetic spiral. The line "which may be 

 drawn round a stem with alternate 

 pbyllotaxis, passing in regular succes- 

 sion through the bases of the leaves 



G-eotropism, 494 



Gills (of Mushroom), 91 



Globoids, 451 



Globule. The antheridium of Chara 



Glochidia, 147 



Glucase, 455, 456 



Glucosides, 462, 458 



Gonidangia. The structures in which 

 gonidia are produced 



Gonidia. The asexual reproductive cells 

 produced upon gametophytes. They 

 are sometimes also called spores 



Gouidiophore, 71 



GonidiophylU. Leaves of the gameto- 

 phyte which boar gonidangia 



Goni'mublasts, 51 



Growing points, 36 



Growth, 470 



— efEect of light upon, 438 



■ — grand period of, 474 



Gynandrous. A term used to indicate 

 that the filament or filaments of the 

 audroecium of a flower are united with 

 the upper part of the pistil, forming 

 a central column 



Gynobasic style. One which springs from 

 the base of the carpel instead of its 

 apex 



Gy7io3Cium. The pistil, or collection of 

 carpels in a flower 



GynqpJiore. The part of the axis of the 

 flower between the insertions of the 

 stamens and ovary 



JJapiera. The organs of attachment of 

 certain Algae, 36 



Hausloria. The outgrowths through 

 which many parasites absorb noiurish- 

 ment fi'om their host plants. They 

 are generally of the nature of roots 



Heliotropism, 493 



Ilemicy die flowers. Those in which the 

 perianth, leaves are arranged in whorls 

 and the sporophylls in spirals 



Hermaphrodite. A terra applied to 

 flowers possessing both stamens and 

 carpels, also to gametophytes produ- 

 cing reproductive cells of both sexes 



Hcterocysts, 39 



Jlelerodromous. A term used to indicate 

 that the genetic spiral of the leaves of 



a stem turns in a difEerent direction 

 from those of the branches 



Heteroecious, A term applied to certain 

 fungi, which in different phases of 

 tbeir life infest two different plants, 

 90 



Heterogamous. Having differentiated 

 male and female gametes 



Heteromerous, 96 



Heterospory, The peculiarity of produ- 

 cing macrospores and microspores, pos- 

 sessed by many of the Pteridophyta 

 and all the Phanerogamia, 514 



Homodromous. A term used to indicate 

 that the genetic spiral of the leaves 

 turns in the same direction in the 

 stem and its branches 



Homoiomerous, 96 



Momosporous = isosporous. Possessing 

 only one kind of spore 



Homotropous. Erect, A term applied to 

 the embryo 



Hormogonia. Vegetative reproductive 

 bodies of the Oyanophycese, 39 



Humus, 416 



Hybridisation, 521 



Hydrophilous, 519 



Hydrotropism, 499 



Hymenial layer, 84, 91 



Hyphw. The thread-like cells or fila- 

 ments of the fungi 



BypocotyL That part of the axis of a 

 seedling which lies between the base 

 of the radicle and the insertion of the 

 cotyledons 



Hypoderma. The i-egiou immediately 

 underlying the epidermis 



liypogynous. Springing from the axis 

 of the flower below the ovarj'. Applied 

 to petals and stamens 



Hyponasty, 475 



Hypophysis, 185 



Hypsophyll. Bract 



Indusium. The membrane covering a 



sorus or collection of sporangia, 133, 



145. Aliio applied to the cup-shaped 



expansion of the upper part of the 



style in the Goodeniacece, 374 

 Integuments, 171 

 Inulase, 455. 456 

 Tuvertase, 455, 456 

 Involucre. A whorlorcollectioj of bracts 



at the base of a flower or an iuflores- 



cence 

 Irritability, 484 

 Iso-hilateral. A term applied to leaves 



whose upper and lower halves have 



the same structure 

 Isogamous. Having gametes which are 



not differentiated into male and 



female 

 Isomerous floioers. Those which have 



the same number of parts in each of 



the floral whorls 

 Isosporous. A term applied to plants 



which have spores of only one kind 



