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F E R N S OF NO R TH AM E R IC A . 33
P l a t e L .
A S P L E N IU M T H E L Y P T E R O ID E S , M i c h a u x .
Silvery Spleenwort.
A s p l e n i u m t h e l y p t e r o i d e s : — Root-stock creeping, covered,
on the upper side at least, rvith persistent stalk-bases;
stalks nearly a foot long, sparingly chaffy when young; fronds
growing in a crown, one and a half to nearly three feet
long, lanceolate in outline, slightly narrowed towards the base,
membranaceous, often somewhat hairy along the veins, pinnate;
pinnæ spreading, linear-lanceolate, acuminate, deeply pinnatifid;
lobes crowded, oblong, obtuse, obscurely serrulate,
each with a central midvein and three to eight oblique simple
veins on each side, all but the few uppermost veins of
each lobe fertile; indusia oblong, mostly single, but those on
the acuminations of the pinnæ often double, when young
arched and with a silvery lustre, soon opening along the
outer margin and disclosing the sporangia.
Asplenium thelypteroidesp M i c h a u x , F L Bor.-Am., ii., p. 2 6 4 . — S w a r t z ,
Syn. Fii., p. 8 2 .— SCHKUHR, Krypt. Gew., p. 7 1 , t. 7 6 , h .—
■This name w.as w.itten thdyptcrmdes by Michaiix, Schkuhr, Pi.rsli and Torrey
Willdenow has ¡1 tk c lyt tro ties . The remaining an.hors h.ave the orthography here t.sed.
Which IS m accord with common usage i.i words o f like derivation. S w a r t z ’s name
Asflleniu^n acrostichoides, is really the oldest by throe years, but is badly chosen, and
has never come into general use.
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