Rhizoma creeping. Fronds crowded.
L en g th of frond eighteen inches; b readth in widest p a rt two
inches and a half.
Sori diminutive, numerous, thickly scattered over the up p e r
h a lf of the frond.
ATins inte rn a l and scarcely to be seen.
Aly thanks are due to Alessrs. Rollisson, of Tooting, for plants
and fronds of this F e rn .
I t is in Alessrs. Rollisson’s collection at Tooting.
The illustration is from a plan t in my own collection.
T h e re seems to be some obscurity reg a rd in g this class of Ferns.
F e e gives six species, namely, irioides, irreguläre, longissimum,
sessile, trifidum, and p almatum. T h e irreguläre of L in k seems
to be a very different F e rn to the P . irioides; and another
species known in gardens as the P . platyo tis is also distinct,
as indeed the p resent F e rn appears to be. T h e re is a marked
difference in the hab it and venation of these species, y et, owing
to the la tte r being so imperfectly seen, the differences are not
well understood.
