ETYMOLOGY. 
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Hymenophyllum, hymen, membrane, phyllon, leaf ; “ Filmy - 
leaf Fern.” 
Hymenostachys, hymen, membrane, stachys, a spike ; the fruc- 
tification on spikes. 
Hypoderris, hypo, under, derma, skin ; the indusium under the 
sori, like a thin skin. 
Hypolepis, hypo, under, lepis, a scale ; the sporangia under 
the indusium. 
Isoetes, isos, equal, etes, the year ; remaining the same through- 
out the year. 
Isoloma, isos, equal, loma, a border or margin ; the indusium 
and margin equal. 
Kaulfussia, in honour of D. G. F. Kaulfuss, of Halle, a cele- 
brated writer on ferns. 
Lastrea, in compliment to Chev. de Lastre, a French nobleman. 
Lepicistis, lepis, scale, Icistis, a cyst or cell; the sori being im- 
mersed in scales, which form a cyst. 
Leptochilus, leptos, slender, clieilos, lip ; narrow indusium. 
Leptogramma, leptos, slender, gramma, a line ; short linear sori. 
Leucostegia, leukos, white, stegos, a cover ; the indusium being 
pale-coloured, approaching white. 
Lindsasa, in honour of Dr. Lindsay, of Jamaica, a writer on 
the germination of mosses and ferns. 
Lithobrochia, lithos, a stone, brocha, spots ; the areoles of the 
reticulated veins like pavement. 
Llavea, named by Lagasca after a Mexican traveller. 
Lomaria, loma, a fringe or border ; relating to the indusium. 
Lomariopsis, lomaria, opsis, like ; like Lomaria. 
Lonchitis, logche, a lance ; form of pinnae. 
Lopholepis, loplios, a crest, lepis, scale ; the sori being furnished 
with a tuft of slender scales. 
Lophosoria, loplios, crest or tuft ; sori furnished with hairs like 
a tuft. 
Lorinseria, in honour of Gustave Lorinser, a Bohemian 
physician. 
Loxsoma, loxos, oblique, soma, band ; the oblique broad ring of 
the sporangium. 
Lycopodium, lykos, wolf, pous ; foot-resemblance. 
Lygodium, lygodes, flexible ; climbing plant. 
