110 I'TKRIS AlUa'TA.
From the islands of Madeira, St. Tfelona, the Canaries, .Azores,
and Po rtu g a l.
In tro d u c ed into the Royal Gardens, Kew, in the year 1778.
T h e fronds are glabrous, spreading, somewhat deltoid, char-
tacoous, bitripinnatc. Pinn u le s linear-acuminate, with linear-
oblong segments, which are obtuse, and having a dentate margin.
Stipes usuall)' about h a lf the length of the frond. Roth stipes
and rachis of a shining greenish brown colour, with two blackish
narrow bands. Terminal adhe ren t to an erect rhizoma. Stipes
having few long hair-lik e scales. In a section the stipes is
ro u n d ed beneath and fluted above.
L en g th of frond from th re e to five feet; colour pale green.
In my specimens, in fronds five feet in length three feet are
naked.
Sori linear, extending from the base to nearly the apex of
the pinnules, and h a lf waj' down the d e cu rren t portions. Veins
well scon, being much paler in colour than th a t of the frond.
Aly thanks are due to Sir Oswald Alosley, B a rt., of Rolleston
F la il; Air. Ijamb, g a rdener to F. AVright, E sq ., of Osmaston
Alanor, near Ash b o u rn ; and to Air. Sim, of F o o t’s Cray, for
plants of P . a rg u ta ; and to Air. Norman, of H u ll, for fronds.
I t is in the Catalogues of Alessrs. Sim, of F o o t’s C ray ; AYltch,
Ju n ., of Chelsea; P a rk e r, of Ilo llow a jg Kenned^', of Covent
G a rd en ; Booth, of H am b u rg ; and Cooling, of Derby.
T h e mature fronds are too large to figure en tire ; the illustration
is from a young plan t in my own collection.