Page:Manual of the New Zealand Flora.djvu/995

Dicksonia.] At Whangarei, Bay of Islands, and other northern localities this usually produces a short stout trunk, but to the south of Auckland it is invariably stemless. Possibly there may be two distinct varieties with a different geographical range, but so far I have failed to find distinctive characters to separate them.

Rhizome usually long and creeping, paleaceous. Fronds large or small, usually compound, very variously divided, rarely simple, stipitate; texture coriaceous to membranous. Veins always free. Sori dorsal, but close to or at the margin of the frond, terminating a vein or veinlet, globose or more or less elongated. Indusium oblong or ovate to orbicular or broader than long, attached by a broad base under the sorus, its sides either free or adnate to the frond, open at the top. Sporangia numerous, stalked, girt by an incomplete vertical ring, bursting transversely.

1. D. Tasmani, ''Cheesem. in Trans. N.Z. Inst''. xxiii. (1891) 416.—Rhizome long, stout, as thick as the finger, wide-creeping, densely clothed with chestnut-brown subulate ciliated scales. Stipes strong, rigid, smooth, 3–9 in. long. Fronds 4–12 in. long, 3–9 in. broad, broadly deltoid or pentagonal, very thick and coriaceous, quite smooth and glabrous, 2–3-pinnatifid. Lower pinnæ much the largest, broadly deltoid or rhomboidal; upper narrower, ovate or lanceolate. Pinnules oblong, cut down nearly to the base into 6–9 segments; segments short, oblong, obtuse. Sori very numerous, usually one to each segment, marginal, the segment usually produced on the outer side into a stout projecting horn. Indusium narrow cup-shaped, attached by the sides as well as the base.—Field, N.Z. Ferns, 75, t. 24, f. 5; ''Bak. in Ann. Bot''. v. (1890–91) 201.