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I I à m m ím
GENUS I.
H Y M E N O P H Y L L U M . S m i t h .
A G R O U P of dw a rf F e rn s for th e most p a r t more resembling
mosses th an F e rn s , two o f wh ich , H . tunhridgense and I I .
unilaterale, are natives of G re a t B rita in . T h e y are all difficult
to cultivate, which ren d e rs th e foreign species ra re in a living
state in this country.
T h e fronds are p e llu c id , membranaceous, simple, or decompound,
with a c reeping and mostly filiform rhizoma.
Sori situated w ith in a two-valved involucre.
Veins dichotomously b ran ch ed , be in g simple an d costEcform
in th e segments.
The name is d e riv ed from th e G re ek , h ymen— o. membrane,
and phyUon—a leaf.
Kn own in E n g la n d as th e “ F ilm F e rn ,” or “ F ilm y F e rn .”
Sir W . J . H o o k e r gives eighty-five species in his “ Species
Filicum ,” namely,—■
Cru en tum, Cavanilles, Chiloe.
Ma rginatum, Hooker, N ew
Hollan d .
Asplenioides, Sw a r tz, Jamaica.
A b ru p tum , Hooker, Jamaica.
H irsu tum , Sw a r tz, Jamaica.
Ciliatum, Sw a r tz, W e s t In d ie s.
P lum ie ri, Hooker, Hispaniola .
T richophyllum, Hooker, Cumana
Boryanum, Willdenow , Mauritius
H irte llum , Sw a r tz, Jamaica.
Chiloense, Hooker, Chiloe.
Organense, Hooker, Brazil.
Valvatum, Hooker, Columbia.
Beyriohianum, K u n z e , P e ru .
Mic rocarpum? De svaux, H is paniola.
Capillare ? Desvaux.
Eleg an s, Sprengel, Brazil.
Pu lch e llum , Schlechtendal,
Mexico.
Sericeum, Sw a r tz, Jamaica.
In te rru p tum , 7lM«2e,Pampayaco
P y ram id a tum , D e svaux, T ro p ical
America.
E la sticum, Do ry , Mauritiu s.
B e rte ro i, Hooker, J u a n F e r nandes.
Obtusum, Hooker, Oahu.
iE ru g in o sum , Carmichael, New
Zealand.
L anceolatum, Hooker, Oahu.
L in d e n i, Hooker, Caraccas.
Arbuscula ? Desvaux, IMauritius.