Page:Manual of the New Zealand Flora.djvu/980

940 near the base of the pinnæ on their upper margin and hence supra-axillary, rarely more than one to a pinna. Indusium sub-orbicular, compressed, its base slightly immersed in the segment, deeply 2-valved; valves thin, smooth on the back; margins conspicuously spinulose-dentate.—''A. Rich. Fl. Nouv. Zel. 91; A. Cunn. Precur. n. 243; Raoul, Choix, 39; Hook. Syn. Fil. i. 95; Hook. f. Fl. Nov. Zel.'' ii. 11; ''Handb. N.Z. Fl. 352; Hook. and Bak. Syn. Fil. 67; Thoms. N.Z. Ferns, 35; Field, N.Z. Ferns, 65, t. 14, f. 7. H. pusillum, Col. in Trans. N.Z. Inst.'' xii. (1880) 365; (?)H. pygmæum, Col. I.c. xiii. (1881) 376. H. zeelandicum, Van der Bosch.

18. H. unilaterale, ''Willd. Sp. Plant.'' v. 521.—Forming large patches on the ground among moss or on the roots of trees. Rhizome long, creeping, branched. Fronds 1–4 in. long, linear-oblong, dark-green, rigidly membranous, pinnate below, pinnatifid above. Stipes ½–1½ in. long, slender, wiry, naked; rhachis winged in the upper portion only. Pinnæ narrower and more rigid than in H. Tunbridgense, often pinnatifid on the upper side alone. Segments fewer and narrower, frequently decurved, usually involute, margins conspicuously spinulose-dentate. Sori terminal on short lateral segments near the base of the pinnæ on their upper margin, exactly as in H. Tunbridgense. Indusium obovate-oblong or broadly oblong, turgid, slightly immersed at the base, deeply 2-valved; valves smooth; margins quite entire.—''Hook. f. Fl. Nov. Zel. h. 11; Fl. Tasm.'' ii. 134; ''Handb. N.Z. Fl.'' 353. H. Wilsoni, ''Hook. Brit. Fl. (edit. 1) 450; Sp. Fil.'' i. 95. H. Tunbridgense var. Wilsoni, ''Hook, and Bak. Syn. Fil.'' 67.

19. H. multifidum, ''Swartz, Syn. Fil.'' 149, 378.—Forming matted patches upon the ground or on the trunks or branches of trees. Rhizome much branched, creeping, wiry. Fronds variable