Art. IV.—A New Species of Hypolepis.
[Read before the Auckland Institute, 11th December, 1917, received by Editors, 24th December, 1917; issued separately, 24th May, 1918.]
Hypolepsis Petrieana sp. nov. Carse.
Hypolepis bipinnata, H. millefolio Hook. affinis: differt stipite glabro ± tuberculato; ramis primariis numerosis parum distantibus. Superioribus a rhachi angulis valde obtusis provenientibus; pinnis secundariis in lobos breves late obcuneatos, acutos, subacutos, v. fere obtusos, integros v. ± alte (plerumque a margine superiore) incisos, pro parte maxima alternos, sectis.
Sori parvi rotundati pauci, in lobis singulis, 1, rarius 2.
Rhizoma tenue, repens, squamis linearibus ferrugineis dense vestitum.
This undoubtedly new species of Hypolepis was discovered in December, 1907, by Mr. D. Petrie, M.A., Ph.D., with whose name I have pleasure in associating it.
Rhizome slender, creeping, thickly covered with linear rusty scales.
Stipes 4–6 in. long, rigid, moderately stout, erect, yellow (as are the rhachis and primary costae) or the lower part brownish, glabrous, somewhat rough with scattered depressed tubercles.
Fronds 12–14 in. long, 8–10 in. broad, broadly obcuneate-ovate, subrigid, bipinnate, secondary pinnae pinnatifid or their lower part pinnatisect; primary branches numerous, rather closely placed, the upper diverging almost at right angles.
Rhachis and primary costae sparingly or somewhat closely clothed with delicate crisped hairs; lower primary pinnae narrow ovate – lanceolate, 6–8 in. long, suberect or ascending, shortly stipitate, the upper gradually shorter, narrower, and more strongly diverging; secondary pinnae very shortly stipitate, broadly linear, 2 ¼ in. long or less, cut half-way down, or almost to the costa, into short entire or ± deeply cut (mostly at the upper edge) broadly obcuneate, acute, subacute, or almost obtuse, usually alternate, lobes, that are glabrous above and nearly so below; midrib with a few short hairs, chiefly on the under-surface.
Sori 1, or rarely 2, on each ultimate lobe, small, rounded, the common one partially covered by a very short reflexed lobule projecting from the upper basal border of the lobe, the second (when present) placed about halfway up the lower side of the lobe and more or less covered by its slightly expanded and recurved margin.
Indusium composed of the almost unaltered reflexed portions of the lobes described above.
Hab.—Vicinity of Otorohanga, Waipa County, and Port Charles, Coromandel County. D. Petrie!