GLOSSARY AND IXDEX. 



Dentate (Lat. dens, a tooth), 

 toothed. 



Denticulate (Lat. denticulus, di- 

 minutive of dens, tooth), finely 

 toothed. 



Devonian Age, Pteridophytes of, 

 66. 



Dichotomous (Gr. i\a, asunder, 

 and re'/LLi'eir, to cut), two-forked. 



Dicksonia. Vide Dennstaed- 

 tia. 



Dimorphism, 3. Literature of, 7. 



Dimorphous (Gr. Sis, twice, and 

 /uo>p4>7J, shape, form), of two forms; 

 said of ferns whose fertile fronds are 

 unlike the sterile. 



Dioecious (Gr. Sis, twice, and <HKOS, 

 house), bearing the male and female 

 organs on different plants. 



Distichous (Gr. Sis, twice, and 

 OTI'XOS, a ro\v\ disposed in two rows. 



Distribution, Geographic, 60. 

 Geologic, 61. Local, 4. 



Dryopteris, no; also 2, 5, 7, 8, 10, 

 ii, 16, 26, 42, 80. 



E 



Ebeneous (Lat. ebenus, ebony), 

 black like ebony. 



Elater, the spirally coiled append- 

 ages of the spores of Equisetum. 



Endospore (Gr. ivlov, within, and 

 <7ropds, a seed), the inner wall of the 

 spore. 



Epidermis (Gr. em, upon, and 

 Sc'pfia, the skin), the external cover- 

 ing of the plant. 



Epiphytic (Gr. tn-i, upon, and 

 <f>vTov, a plant), growing upon an- 

 other plant, but not nourished by it. 

 Equisetaceae, 126; also 31. Lit- 

 erature of, 34. 



Equisetum, 126; also 3 i, 33 . 

 Exospore (Gr. efw, outside, and 

 o-iropds, a seed), the external covering 

 of the spore. 



Falcate (\*a\..falx, a sickle), scythe- 

 shaped; slightly curved upward. 



Farinose (Lat. farina, ground 

 corn), covered with a white or yel- 

 lowish powder. 



Fern Allies, 28. 



Fern Structure, Literature of, 

 28. 



Ferns, Artificial Synopsis of genera 

 of, 79. Mode of growth, 2. Time of 

 fruiting, 4. Variation in, 2. 



Ferruginous (Lat./<rrr>, iron), 

 resembling iron rust. 



Fertilization, 21. 



Fibrill ose (Lat. fibra, a thread), 

 formed of small fibres. 



Filiform (Lat. filum, a thread, 

 forma, form), thread-like. 



Filix, 119; also, 4, 5, 6, 1 6, 27, 80. 



Flabellate (Lat. Jlabellum, a fan), 

 fan-shaped; broad and rounded at 

 the summit and narrow at the base. 



Flaccid (Lat. flaccus, flabby), soft 

 and weak. 



Floating-fern. Vide Cera- 

 topteris. 



Flowering-fern. Vide Os- 

 munda. 



FoliaceOUS (Lat. folium, a leaf), 

 having the nature of a leaf. 



Fovea (Lat. a small pit), the depres- 

 sion in the leaf of Isoetes containing 

 the sporangium. 



Frond (Lat. frons, a leafy bough), 

 that which answers to the leaf in 

 ferns, 8, 26. 



Fructification of Ferns, 10; of 

 OPHIOGLOSSACE.B, 30; of Equisetum, 

 33; of Club-mosses, 35; of Isoetes, 38; 

 of Marsilia, 39; of Pilularia, 39; of 

 Asolla, 39; of Salvinia, 40. 



Fulvous (Lat. fulvus, reddish-yel- 

 low), tawny. 

 Fungi, 56- 



Genera, 45- 

 Generic Names, 47- 

 Geographic Distribution, 60. 

 Geologic Distribution, 61. 



