940 FILICES. | Hymenophyllun. 
ment near the base of the pinnz 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 con- 
spicuously spinulose-dentate.—A. Rich. Fl. Now’. Zel. 91; A. Cunn. 
Precur.n. 243; Raoul, Choix, 39; Hook. Sp. Fil. 1. 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. pyg- 
meeum, Col. l.c. xii. (1881) 376. H. zeelandicum, Van der Bosch. 
Var. cupressiforme, Hook. f. Fl. Nov. Zel. ii. 11.—Fronds taller and nar- 
rower, More erect, 1-4in. high. Pinne distant; segments more rigid, narrower, 
often decurved. Sori free, almost stipitate.—H. cupressiforme, Labill. Pl. 
Nov. Holl. ii. 102, t. 250. H. revolutum, Col. in Tasmanian Journ. Nat. Sci. 
(1845) 26. 
NortH AND SoutH IJs~tanps, STEWART ISLAND, AUCKLAND ISLANDS: 
Abundant throughout. Sea-level to 3000 ft. 
An abundant plant in most temperate and subtropical countries, and 
everywhere highly variable. Var. cupressiforme has much of the habit of the 
next species, but the valves of the indusium are spinulose-dentate. 
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 1-4in. long, linear- 
oblong, dark-green, rigidly membranous, pinnate below, pinnatifid 
above. Stipes $-l1din. long, slender, wiry, naked; rhachis winged 
in the upper portion only. Pinne narrower and more rigid than 
in H. Tunbridgense, often pinnatifid on the upper side alone. Seg- 
ments fewer and narrower, frequently decurved, usually involute, 
margins conspicuously spinulose-dentate. Sori terminal on short 
lateral segments near the base of the pine on their upper mar- 
gin, exactly as in H. Tunbridgense. Indusium obovate-oblong or 
broadly oblong, turgid, slightly immersed at the base, deeply 
9-valved ; valves smooth; margins quite entire.—Hook. f. Fl. Nov. 
Zet. ii. 11; Fl. Tasm. ii. 184; Handb. N.Z. Fl. 353. H. Wilsoni, 
Hook. Brit. Fl. (edit. 1) 450; Sp. Fil. i. 95. H. Tunbridgense 
var. Wilsoni, Hook. ana Bak. Syn. Ful. 67. 
NortrH anp SoutH Is~tanps, StEwart IstaAnpD: From Te Aroha Mountain 
southwards, not common, chiefly in mountain forests. Sea-level to 3500 ft. 
Very closely allied to H. Tunbridgense, and sometimes hardly to be dis- 
tinguished from it in the absence of fruit, but usually the frond is taller and 
narrower and more rigid, the pinne are sparingly divided and decurved, the 
segments often unilateral, and the indusia narrower and more turgid, with the 
margins of the valves quite entire. 1ts geographical range is nearly the same 
as that of H. Tunbridgense, but it is a much less abundant plant. 
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 
