IS O L O M A . Sm .
L in d sæ æ sp. A u c t.
In d u s ium speciale marginale, bilabiatum, lineare, planum. S p o ra n g ia verticalia.—
Frondes 1—‘¿-pedales, lineares,p in n a tæ . Pinnæ ohlongo-ellipticæ v. lanceolato-
fa lc a tæ hasi truncatæ v. a u r icu la tæ hrevissime p e tio la toe ; p e tio lu s cum rachi
a rticu la tu s. Costa c entralis. Venæ fu r c a tæ : venulæ rectæ, apicibus receptáculo
sporangifero continuo unitis, in p ín n u la s te r ili liberis. J . Sm .
Isoloma lanuginosnm. J . S m .— Lindsæa ? lanuginosa, Wall.
H a b . East Indies.
The two Ferns placed in this Genus by Mr Smith are the Lindsæa lanuginosa and Vit-
taria (Lindsæa, Hook, et Grev. Ic. Fil. t. 226) divergens of Wallich: and he observes,
that though Isoloma resembles Nephrolepis in habit, its fructification is that of Lindsæa,
from which it differs in the pinnæ being deciduous, as in Nephrolepis, Didymochlæna, &c.;
and, like them, having the sterile veinlets usually thickened, and producing a white chalky
substance in the form of a dot on the superior side, near the margin of the frond.
Fig. I. Sterile p in n a; / 2. Portion of a sterile p in n a; / . S. Fertile p in n a: f . 4. Porlion o f the
latter ; / . b. Portion of the indusium, showing the sporangia on the receptacle : f . 6. Hair from the
pinnæ ; f . 7, 8. Sporangia ; f . 9. Sporules all more or less magnified.
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