GLOSSARY. 269 



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



of some adiantums. 

 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. 

 ELATER. One of the two bands into which the outer coat of the 



Equisetiim 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 exudation. 

 C,\ XOSPORE. The larger spore in Isoetes 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. 



