Horrowav.—Studies in the New Zealand Hymenophyllaceae. 599 
of which it is pendulous. Less frequently it may be found pendulous from 
the under-side y leaning stems or on the bases of tree-ferns along the 
watercourses. the rather light forests of North Auckland 7. elongatum 
and T. humile are almost invariably in close Maioniatiog - on the banks of 
watercourses. 
our out of the seven New Zealand species of Trichomanes — 
T. Lyallii, T. venosum, T. Colensoi, and T. humile—are exceedingly delicate 
and slender plants, which are unable to modify the frond-form by stunting 
or imbrication, and probably on this account are confined to such low 
epiphytic or dy sede stations as allow them to adopt the mat growth- 
form e New Zealand species of Trichomanes with the exception of 
y Us reniforme means a restricted station. 
B. Description of Two Selected Localities. 
The above account of the species and of the associations in which they 
occur is based upon detailed field-notes taken in a large number of localities 
throughout Westland. In ех to gather together these facts I now pro- 
pose, before leaving this part of my subject, to give a description of the 
Hymenophyllaceae of two pa pes localities—viz., Mount Greenland, Ross, 
and the Otira Gorge (see map 2, on page 579). 
Mount Greenland may be considered as the well-defined, heavily forested 
block of high land, outlying from the main ranges, rising immediately at 
the back of Ross, and thus not far from the coast-line, and encircled by the 
Mikonui and Totara Rivers. Its base is no more than 100 ft. above sea- 
level, and its long flat summit, 2,970 ft. in height, rises a little above the 
of the effect of increasing altitude upon the distribution of the Hymeno- 
phyllaceae, and of the difference in the humidity of the gullies and of the 
spurs and ridges. 
The lower flanks and the larger valleys show only the сыныш 
uer ata associations—viz., H. dilatatum, H. scabrum, and T. ren 
horizon oughs and tree-trunks ; H. ferrugineum and T. venosum on run 
fern vain: ; H. australe and H. Tunbridgense on tree-bases, and the latter 
also on mossy stones and fallen logs ; luxuriantly growing H. sanguino- 
lentum and H. multifidum as mid-epiphytes; H. issum on the floor ; 
T. strictum in sheltered terrestrial =. Н. flabellatum and Н. rarum 
i trunks a 
on tree-ferns. Such of the species as can occupy a s high руне station 
—viz., H. sanguinolentum, H. multi, , H. Armstrongii, H. rarum, and 
llatum—ascend in the gullies iio 7 Ша tops of the tallest trees. The 
above species are pM in abundance up to an altitude of 1,000-1,200 ft., 
and: 
` The track to the summit traverses the Peirus flank of the mountain 
at an altitude of about 2,000 ft. The humidity of the forest on shaded 
flanks at these pp is фана bledly higher than on north-facing hill- 
sides, or even than on the hillsides at lower altitudes, on account of the 
frequent presence of а mountain-mists. Hence these shaded upland 
flanks will be favourable localities for such Hymenophyllaceae as occur 
