GLOSSARY. 



917 



Gills, the radiating plates on which the basidio- 



spores of Agarics are produced. 

 Glabrous, without haiis; quite smooth. 

 Glandular, having the nature of a gland, bearing 



glands. 

 Gleba, the chambered, sporogenous layer of a Gas- 



teromycetous Fungus. 

 Globoid, the tiay mass of magnesium and calcium 



phosphate which is often present in aleurone grains 



(which see). 



Glomerule, a cymose inflorescence formed into a 

 head, as in the Globe-thistle. 



Glucoside, a compound consisting of glucose and an 

 aromatic body. 



Glumes, the chaffy, bract-like scales on the inflores- 

 cences of Grasses and Sedges. 



Goneoclinic, used of hybrids which approximate to 

 one or other parent-form rather than standing mid- 

 way between them. 



Graft-hybrid, a hybrid supposed to have arisen by 

 budding or grafting. 



Gynandria, the 20th class of the Linnean system. 

 Of. vol. ii. p. 290. 



G3moeceum, the carpel, or aggregate of carpels, in a 

 flower ; the female portion of a flower as a whole. 



Habitat, the natural abode of a plant. 



Haematochrome, the red pigment found in the eye- 

 spots of Chlamydomonadeae and zoospores. 



Halophytes, plants which flourish on soils rich in 

 salt; saltworts. 



Haulm, the stalk of a grass of any kind. 



Haustorium, the sucker of a parasitic plant. 



Herbaceous, of the colour, texture, &c., of a herb. 



Herbal, a book of descriptions of plants with especial 

 reference to their medicinal properties ; herbals 

 were usually copiously illustrated. 



Herbarium, a collection of dried plants systemati- 

 cally arranged. (Formerly it signified an illustrated 

 herbal.) 



Hermaphrodite, applied to a flower which has both 

 stamens and carpels. 



Heterochromatism. Vide vol. ii. p. 669. 



Hetercecism, the act of passing through different 

 stages of development on different hosts ; as in 

 Fungi. 



Heterogamous, applied to plants that bear two 

 kinds of flowers which differ sexually. 



Heterogamy, the state or quality of being hetero- 

 gamous (which see); cross-pollination. 



Heteromorphism, here used to designate the various 

 modifications of equivalent members in connection 

 with different functions, analogous to that existing 

 among the polyps of a coral. 



Heterophyllous, bearing leaves of more than one 

 form on the same stem; applied especially in respect 

 of foliage-leaves. 



Heterosporous, having spores of different kinds, 

 especially macrospores and microspores. 



Heterostyled, when the flowers of a plant differ in 

 the relative length of their styles: opposed to homo- 



Hilum, (1) of starch-grain; the centre around which 

 the stratifications are deposited ; (2) of a seed ; the 

 scar or place of attachment. 



Hirsute, bearing rather stiff hairs. 



Holosericeus, covered with fine silky hairs. 



Homochromatism. Vide vol. ii. p. 569. 



Homosporous, having spores all of a kind. 



Horaostyled. See Heterostyled. 



Hortus vivus, an old term for a dried collection of 

 plants, now called a herbarium {hortus siccus is also 

 used in the same sense). 



Humus, vegetable mould ; a soil largely composed of 

 decajring vegetable matter. 



Hybrid, a plant resulting from the intercrossing of 

 more than one species. 



Hybridization, the act of crossing different species 

 and so producing hybrids. 



Hydrophytes, plants which live in water. 



Hydrotropism, the particular irritability of plant- 

 members (especially roots) whereby they respond by 

 curvatures to moisture in the environment, turning 

 towards or away from it. 



Hymenium, hymenial layer ; the spore-bearing sur- 

 face of a fungal receptacle. 



Hypanthium, a term given to any special enlargement 

 of the receptacle, as in the Rose. 



Hypha, the filamentous element of the thallus of a 

 Fungus. 



Hyphodromous, used when the veins of a leaf 

 run so that they are not visible on the surface. 



Hypocotyl, the portion of the stem below the coty- 

 ledons. 



Hypocrateriform, salver-shaped: used of corollas, 

 &c., which are tubular below and suddenly expand 

 into a flat limb. 



Hypogeal, underground; growing beneath the surface 

 of the earth. 



Hysterophyta, Endlicher's term for the parasitic 

 flowering plants. 



Idioplasm, name apphed by Naegeli to that portion 

 of the protoplasm in which the formative activity 

 was supposed to reside — the active, organizing 

 portions of the protoplasm. 



Illegitimate union in heterostyled flowers. Vide 

 vol. ii. p. 405. 



Imbricate aestivation. Vide vol. ii. p. 210. 



Imbricating, overlapping Uke the tiles of a roof. 



Incised, of leaves, cut irregularly and sharply. 



Indumentum, a hairy covering or coating. 



Indusium, the scale-like outgrowth of a Fern leaf 

 enveloping the sorus. 



Inferior, (1) of the ovary; adherent to the calyx (cf. 

 also vol. ii. p. 79) ; (2) of the calyx, free from the 

 ovary ; (3) in regard to the relation of parts of 

 flower to the axis ; farthest from the axis. 



Inflorescence, the mode of branching of the flower- 

 bearing part of a plant ; or, the actual cluster of 

 flowers (the common use of the term). 



Infundibuliform, Infundibular, funnel-shaped. 



Innovatio, a new-formed shoot. 



Insectivorous plants, plants which catch insects 

 and absorb their juices. 



Integument, the envelope — single or double — of an 

 ovule. 



Internode, the portion of a stem between the points of 

 insertion of leaves. 



Intine, the internal layer of the wall of a pollen-grain. 



Introrse, of the anther; dehiscing towards the centre 

 of the flower. 



Intussusception, the taking up by a living organism 

 of new particles between those already in existence. 



