3 7^ GLOSSARY. 



Glaucous (pale green, gray). Whitened with a bloom, like 

 that on a cabbage-leaf. 



Glume (a husk). A chaff-like bract belonging to the inflores- 

 cence of grasses; the outer glumes subtend the spike- 

 let; the flowering glume is the bract of the flower. 



Gluten (glue). A term used for the glue-like products of 

 plants, especially of seeds. 



Grain. A seed-like fruit, like those of grasses, with pericarp 

 adnate to the seed; also any small rounded body, as of 

 starch or chlorophyll. 



Growing point. The group of meristem cells at the growing 

 tip of an organ, from which the various tissues arise. 



Gynaecium (female household). The pistil or, collective, pistils 

 of a flower. 



Haustorium, pi. haustoria (drinking-organs) . The absorbing- 

 organs of certain parasitic plants. 



Hermaphrodite (both male and female). Having both kinds of 

 sexual organs borne together on the same axis. 



HeterogamousJ (having unlike gametes). Applied to plants 

 whose pairing gametes are dissimilar. 



Heterosporous (having unlike spores). Applied to plants in 

 which the sporophyte produces two kinds of asexual 

 spores. 



Homosporous (having similar spores). Applied to plants in 

 which the sporophyte produces but one kind of asexual 

 spore. 



Host. The plant upon which parasitic plants (or organisms) 

 develop, and from which they derive their nourishment. 



Hygroscopic (moisture-seeing). Having an avidity for water. 



Hymenium (a membrane). In Fungi, a surface layer of vertical 

 filaments containing or bearing spores. 



Hypha, pi. hyphcz (a web). The slender vegetative filaments 

 of Fungi which may or may not be woven into a mat 

 (mycelium), or a plant -body. 



Hypoderma (under the skin). The thick- walled tissues beneath 

 the epidermis, which serve to strengthen it, but do not 

 belong to the fibro-vascular bundle. 



Hypogynous (being under the ovary). Applied to those 

 flowers whose parts are at or below the base of the ovary. 



Incumbent (leaning or resting upon). Said of cotyledons, when 

 the radicle is against the back of one; of anthers, when 

 they lie against the inner face of the filament. 



