942 FILICES. [Hymenophyllum. 
Nort Istanp: Hilly forests from the Great Barrier Island (C. P. Winkel- 
mann !) and Cape Colville southwards, not common to the north of the Hast 
Cape. SoutH Isuanp, Stewart IsLanD, CHaTHAM IsLaNDs: Not uncommon 
throughout. Sea-level to 3000 ft. 
Confined to New Zealand, Allied to H. multifiduwm, but a larger and less 
rigid plant, of a paler-green colour, and with smaller indusia immersed in the 
tips of the segments, not axillary. 
2. TRICHOMANES, Smith. 
Ferns, usually of small size. Rhizome slender or rather stout, 
often much branched, glabrous or tomentose. Fronds compound 
or rarely simple and entire, of the same delicately membranous 
texture as Hymenophyllum, often pellucid, usually of a single layer 
of cells, rarely of 3-6 layers. Ultimate segments linear or narrow- 
oblong, entire or rarely toothed at the margin, with a stout central 
costa. Sori marginal, terminal or lateral, more or less immersed in 
the frond or quite free, always terminating a vein. Indusium 
tubular or trumpet- -shaped, truncate at the mouth or with a narrow 
spreading lip or border, usually of the same texture as the frond. 
Receptacle elongated, filiform or columnar, usually exserted beyond 
the indusium. Sporangia sessile, depressed, surrounded by a broad 
complete horizontal ring, bursting transversely. 
A genus of about 90 species, of almost precisely the same aoogtanhia range 
as Hymenophyllwm, and agreeing with it in habit and in the delicate texture of 
the frond, but differing in the shape of the indusium, which is cylindrical or 
urceolate, and either truncate at the mouth or very shallowly 2-lipped. Of the 
7 species found in New Zealand, 4 appear to be endemic, 2 occur in the Poly- 
nesian islands, one of them extending as far north as Java, the remaining one 
is found in Australia and Tasmania. 
* Fronds simple and entire. 
Fronds 2-4 in. diam., broadly reniform with a deep sinus 1. T. reniforme. 
** Fronds small, 3-4 in. long, usually pendulous, delicately membranous, 
pinnately or 2- pinnately divided; divisions comparatively few. 
Fronds 3-14 in., digitately or flabellately divided, margins 
ciliated with branched rufous hairs. Indusium ob- 
conical, immersed .. 2. T. Lyall. 
Fronds 1-3in. ., dull dark- -green, irregularly 2- pinnatifid, 
segments with a single unbranched costa ; 3. T. humile. 
Fronds 1-4 in., pale-green, irregularly 2- pinnatifid, costa 
of the segments siving off numerous dichotomous 
veinlets .. .. 4. ZT. venosum. 
Fronds 1-4 in., dark- -green, 2- 3. pinnately divided ; rhachis 
not winged. Segments very narrow-linear, acute ; costa 
not branched nits a BR ie .. 5. LT. Colensot. 
*** Fronds larger, 4-9in. long, rigidly erect, subcoriaceous, 3-4-pinnatifid ; 
divisions numerous. 
Fronds lanceolate, pale se sa ultimate segments 
narrow-linear, obtuse > ‘ Pe .. 6. Z. stractum, 
Fronds ovate - deltoid, dark - green ; ‘ultimate segments 
broad, oblong, incised at the tips ie 55 .. 7. T. elongatum. 
