528 



MANUAL OF BOTANY 



being separated by coiijuuctivc or 

 ground tissue 



Gamopelalous. Having the petals coher- 

 ing laterally (similai'ly gauiosepalous) 



Gamostelic. The condition when the 

 steles of a polystclic stem are arranged 

 in a ring and 'more or less completely 

 fused together laterally 



Geinmce. Vegetative reproductive struc- 

 tures found among tlie Thallophyta 

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



Genera, 4 



Genetic spiral. The line which may be 

 drawn round a stem with alternate 

 phyllotaxis, passing in regular succes- 

 sion through the bases of the leaves 



Cleotropism, 494 



Gills (of Mushroom), 91 



Globoids, 451 



Globule. The antheridium of Chara 



Glochidia, 147 



Glucase, 455, 456 



Glucosides, 4G2, 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 



Gonidiophylls. Leaves of the gameto- 

 phyte which bear gonidangia 



Gonimublasts, 51 



Growing points, 36 



Growth, 470 



— effect of light upon, 4S8 



— grand period of, 474 

 Gijnaridrous. A term used to indicate 



"'that the filament or filaments of the 



androecium of a flower are united with 



the upper part of the pistil, forming 



a central column 

 Gnnohasic sfijle. One which springs from 



'the base of the carpel instead of its 



ajicx 

 Giinoecium. The pistil, or collection of 



carpels in a flower 

 Gimophore. Tlie part of the axis of the 



flower between the insertions of the 



stamens and ovary 



Haptera. The organs of attaclmient of 

 certain Algfe, 36 



llauatoria. The outgrowths through 

 which many luirasites absorb nourish- 

 ment from their host plants. They 

 are generally of the nature of roots 



Heliotropism, 493 



He niicy die flowers. Those in which the 

 perianth leaves are arranged in whorls 

 and the sporophylls in spirals 



HermapJirodite. A term applied to 

 flowers possessing both stamens and 

 carpels, also to gametophytes produ- 

 cing reproductive ceUs of both sexes 



Heterocysts, 39 



Uelerodromous. A term used to indicate 

 that the genetic spiral of the leaves of 



a stem turns in a different direction 

 from those of the branches 

 Ileteroecious. A term applied to certain 

 fungi, which in different phases of 

 their life infest two different plants, 

 90 

 lleterogamons. Having differentiated 

 male and female gametes 



Heteromerous, 96 



Ileterospory. The peculiarity of produ- 

 cing macrospores and microspores, pos- 

 sessed by many of the Pteridophyta 

 and all the Phanerogamia, 514 



Ilomodromous. A term used to indicate 

 that the genetic spiral of the leaves 

 turns in the same direction in the 

 stem and its bi'anches 



Homoiomerous, 96 



Ilomosporoii.f = isosporous. Possessing 

 only one kind of spore 



llomotropous. Erect. A term applied to 

 the embryo 



llormogonia. Vegetative reproductive 

 bodies of the Cj'anophyceaj, 39 



Humus, 416 



Hybridisation, 521 



H3^drophilous, 519 



Hydrotropism, 499 



Hymenial layer, 84, 91 



Hyphoe. The thread-like cells or fila- 

 ments of the fungi 



Hypocotyl. That ))art of the axis of a 

 seedling which lies between the base 

 of the radicle and the insertion of the 

 cotyledons 



llyiwderma. The region immediately 

 underlying tlie epidermis 



Hypogynous. Springing from the axis 

 of the flower below the ovary. Applied 

 to petals and stamens 



Hypouasty, 475 



H\'pophysis, 185 



Hypsophyll. Bract 



Indiisium. The membrane covering a 

 sorus or collection of spora)igia, 133, 

 145. Also applied to the cup-shaped 

 expansion of the upper part of tlie 

 style in the Goodeniacece, 374 



Integuments, 171 



Inulase, 455, 456 



Invertase, 455, 456 



Involucre. A whorl or collection of bracts 

 at the base of a flower or an inflores- 

 cence 



Irritability. 484 



ho-hilateral. A term applied to leaves 

 whose upper and lower halves have 

 the same structure 



IsogamoKS. Having gametes which are 

 not differentiated into male and 

 female 



Isomerous flowers. Those which have 

 the same number of parts in each of 

 the flcral whorls 



Isosporous. A term applied to plants 

 which have spores of only one kind 



