Art. LVI.—Description of a new Species of Hymenophyllum.
[Read before the Wellington Philosophical Society, 1st December, 1877.]
Rhizome slender, wiry, creeping; fronds few, 2–3 inches long, glabrous, linear oblong or oblong lanceolate, bipinnatifid; stipes about 1 inch long, winged nearly to the base; rachis flexuous, winged, pinæ in from 5–8 pairs, mostly alternate, spreading, about one-third of an inch long, cut nearly to the rachis into 2–4 spreading, linear, forked or bilobate segments. Involucres terminating the segments, small, oval, 2-lipped nearly to the base; lips deeply toothed or jagged; receptacle included.
This interesting addition to our flora was discovered on mountains at the head of Lake Wakatipu by Mrs. Mason, of Queenstown, to whose kindness I am indebted for specimens.
In habit our plant closely resembles Trichomanes humile, but the frond is broader at the base, the pinnæ more divided and spreading. It has affinities with H. javanicum, Spreng., and might possibly be overlooked as a stunted condition of that species but for its different habit. In addition to the larger and more highly divided frond, H. javanicum is distinguished from the present species by its rounded involucres and crisped wings and segments. H. montanum is distinguished from other New Zealand species by its narrow involucres with deeply toothed or jagged tips; it is of membranous texture and of a dull green hue.
In old specimens the segments are slightly constricted immediately below the base of the involucre.
Hymenophyllum montanum, natural size.
Fertile pinnæ, magnified.