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INTRODUCTION. 
margin of the leafit, inserted in the covering j covering, 
being a continuation of the leafit’s outer skin, scale-like, 
opening on inner side. 
HYMENOPHYLLACE.E. 
Fructification placed on a receptacle at the margin of the 
frond at the end of a vein. Eing horizontal. Vernation 
coiled. 
Trichomanes. —Masses on the margin in a somewhat 
hell-shaped receptacle, with a central bristle-like column, to 
which the masses are attached. 
Hymenophyllum.— Masses attached to a central, rather 
club-like column, in an erect two-valved receptacle. 
OsMUNDACEJE. 
Fructification naked, arranged in a cluster on a stalk at 
the end of a frond. Vernation coiled. 
Osmunda.— Masses in cases nearly globular, netted, 
stalked, opening lengthwise from their base as high as a 
transparent dorsal projection; the cases borne in a cluster 
or panicle. 
OrmoGtossACE.E. 
Fructification naked, arranged in a cluster on a stalk 
attached to a frond. Vernation straight. 
Ophioolossum. —Masses in a jointed two-rowed spike, in 
cases joined at the base, one-celled, opening at the side. 
Botrychium —Masses in compound one-sided spike, 
adnate; capsules globular, stalkless, leathery, half two- 
valved, opening rather on the side. 
