yi: 



Gills, the radiating plates on which the basidio- 



spores of Agarics are produced. 

 Glabrous, without hairs; quite smooth. 

 Glandular, having the nature of a gland, bearing 



glands. 

 Gleba, the chambered, sporogenous layer of a Gas- 



teromycetous Fungus. 

 Globoid, the tiny 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 j 



aromatic body. 

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

 : cences of Grasses and Sedges. 

 I Goneoclinic, used of hybrids which approximate to 



one or other jjarent-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. 



Cf. vol. ii. p. 290. 

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



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



I Habitat, the natural abode of a plant. 

 Hasmatochrome, the red pigment found in the eye- 

 spots of Chlamydomonadese 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. 

 j 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. 569. 



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- 

 styled. 



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 8i)oreH all of a kind. 



Homostyled. See Heterostyled. 



Hortus vivus, an old term for a dried collection of 

 plants, now called a hcrltarium (kortui iieeus in klao 

 used in the same sense). 



Humus, vegetable mould ; a soil largely comi>o««l of 

 decaying vegetable matter. 



Hybrid, a plant resulting from the inttrcnming of 

 more than one species. 



Hybridization, the act of crossing different h|xxjwi 

 and so producing hybrids. 



Hydrophytes, plants which live in water. 



Hydrotropism, the particular irritability of plant- 

 members (especially roots) whereby they resjxmd by 

 curvatures to moisture in the environment, tuntiug 

 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 thallas 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 eartli. 



Hysterophyta, Endlicher's term for the jmni-sitic 

 flowering plants. 



Idioplasm, name applied by Nsegeli 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 like the tiles of a nx)f. 



Incised, of leaves, cut irregularly and sharply. 



Indumentum, a hairy covering or coating. 



Indusium, the scale-like outgrowth of a Fini 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-shafwd. 



Innovatio, a new-formed shoot. 



Insectivorous plants, plants which catch in-MxU 

 and absorb their juices. 



Integument, the envelope — single or double — of »n 

 ovule. 



Internode, the portion of a stem between the points of 

 insertion of leaves. 



Intine, the internal layer of the wall of a poUenpuin. 



Introrse. of the anther; dehiscing towards the n-ntro 

 of the flower. 



Intussusception, the taking up by a living orjtranism 

 of new particles between those already in cxistcnos. 



