GLOSSARY. 269 



Dimidiate.— Halved, or as if one half were wanting, as in the pinnules 



of some adiantunis. 

 Dimorphous, — Of two forms ; said of ferns whose fertile and sterile 



fronds are not alike. 

 Dissected. — Cut into many lobes or divisions. 



DORSI-VENTRAL.— Having- an evident upper and under surface ; flat- 

 tened in a plane parallel with the earth. 

 Ela I'ER. — One of the two bands into which the outer coat of the 



Equisetuin spore splits at maturity. 

 Elliptical. — Oblong with rounded ends. 

 Emarginate. — Notched at the summit. 

 Entire. — Not divided ; said of fronds or pinnules whose margins are 



without notches or teeth. 

 Falcate. — Scythe-shaped ; curved upward. 

 Fertile. — Producing spores. 

 Fibro-vasCular. — Consisting of wood-fibres and ducts, as in the 



stems of the fernworts. 

 Filiform. — Thread-like. 

 Flabellate. — Fan-shaped. 

 Foveolate. — Honeycombed. 

 Frond. — A fern leaf. Properly the word frond includes both stipe 



and blade, but frequently it is used simply to designate the 



leafy portion. 

 Fruit. — Sporangia. 

 Fruit-dot. — A sorus. 

 Fugacious. — Short-lived; falling early. 

 Glabrous, — Smooth. 

 Gland. — A minute globular or pear-shaped organ which usually 



secretes a resinous, waxy, gummy, or aromatic product. 

 Glandular. — Furnished with glands. 

 Glaucous. — Covered with a very fine powdery substance, as plums 



are. 

 Glutinous.— Covered with a sticky e,xudation. 

 Gynospore. — The larger spore in Isoctcs and other fernworts ; a 



megaspore. 

 Habit. — The general appearance of a plant. 

 Habitat. — The natural dwelling-place of an animal or plant. 

 Heterosporous. — Producing spores of two sizes or kinds. 



