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plant, commonly known as Hypolepis repens; but I fear the name 
has been changed by recent writers, and probably another name will 
be required for the genus, as many cormophyls, of the genus Chei- 
lanthes, have lately been mixed up with rhizophyllaceous species, 
under the name of Hypolepis. 
Genus Litolobium. 
In which the fructification is marginal and punctiform, and the 
rhizome subterranean. Example, Litolobium punctilobulum, a plant 
that has received an endless variety of names; it is very abundant in 
the United States. 
Genus Eupteris. 
In which the marginal fructification is continuous. Example, 
Kupteris aquilina (the Pteris aquilina of Linneus), perhaps the most 
abundant and familiar fern in the whole world. [I will not give an 
opinion whether the various forms now associated under the name of 
aquilina constitute a single species or many; but I observe that an 
extended knowledge of ferns is invariably accompanied by a ten- 
dency to reduce the number of species. 
Family HyMENOPHYLLEE. 
In which the rhizome is slender and wiry ; the frond semidiapha- 
nous, composed of compoundly divided, winged veins; the stipes 
persistent and not articulated ; the fructification in marginal cups. 
A most natural family, including twenty genera, some of which | feei 
disposed to believe it desirable to drop: I believe all the species with 
with which I am acquainted may be incorporated in three genera. 
Genus Loxsoma. 
Of which the characters are given thus :—* Sori marginal, pointing 
forward, but partially sunk in the axil of a tooth or lobe from the apex 
ofavein. Involucres suburceolate, coriaceous, the outer apparently 
formed of a changed portion of the frond; the mouth truncated, en- 
tire.” Example, Loxsoma Cunninghami. 
Genus Trichomanes. 
In which the seeds are seated on a naked vein, the basal portion of 
which, to which the capsules are adherent, is surrounded by a cup, 
the apical portion projecting like a bristle. Example, Trichomanes 
