Isolhecium .] 
IV. MUSCI. 
465 
Northern and Middle Islands : not uncommon on rocks and stumps of trees, from 
the Bay of Islands, J. D. H., to Otago, Lyall. 
3. I. Arbuscula, Hook./, and Wils. FI. N. Z. ii. 104. Stems erect, 
2-3 in. high, naked below, rigid, rising from a stout rhizome, 2-pinnately 
branched ; branches sometimes decurved and rooting. Leaves pale straw- 
colour, imbricate, spreading, sometimes obscurely distichous, ovate, acute, 
quite entire, very concave ; nerves 2, indistinct. Fruitstalk ^ in. long, 
flexuous, stout, often curved at the top. Capsule suberect or cernuous, ovoid, 
straight or curved, not grooved ; operculum conical. — Hypnurn , Hook. Muse. 
Exot. t. 112. Stereodon, Mitten in Journ. Linn. Soc. iv. 88. 
Var. 0. deflexum. Apices of stem and branches elongated and deflexed, often rooting at 
the tips . — Stereodon deflexus, Mitten, 1. c. 
Throughout the islands, abundant on trees, Lord Auckland’s group and Campbell’s 
hold, J. D. H. (Australia, Tasmania, Aneiteuin.) Mitten regards var. dejlexurn as a dis- 
tinct species. 
4^I^ ramulosum, Mitten, mss. Very similar indeed to I. Arbuscula, but 
the leaves are not nearly so concave, and strongly acuminate. 
Northern and Middle Islands : common on trunks of trees and from the Bay of 
Islands, Jolliffe, to Otago, Hector and. Buchanan. Chatham Islands, Travers. (Victoria.) 
5. I. angustatum, Mitten (Stereodon), Journ. Linn. Soc. iv. 88. Very 
similar to I. Arbuscula, but smaller in all its parts, 2-3-pinnately divided. 
Leaves spreading, subcompressed, narrow-oblong ovate, acute, concave, quite 
entire, those in the branches serrulate above ; periehsetial subulate, spread- 
ing. Capsule short, ovoid, horizontal. 
Northern and Middle Islands : probably common, Raoul ; Auckland, Lyall, Knight ; 
Otago, Dunedin, Hector and Buchanan ; Chain Hills, Lindsay. 
6. I. pulvinatum, Hook./, and Wils. FI. N. Z. ii. 105. t. 88./. 5. 
Small, stems 1 in. high, curved or decurved; branches pinnate, subincurved. 
Leaves bright green, erecto-patent, second, ovate, long-acuminate, rather 
concave, quite entire ; nerve 0; periehsetial squarrose. Fruitstalk £ in. long, 
curved at the top. Capsule ovate, cernuous, terete ; operculum conical. 
Northern Island, Colenso ; Bay of Islands, J. 1). H. ; Auckland, Bolton. 
7. I, gracile, Hook.f.andWils.; — FI. N. Z. ii. 106. — Hypnam, FI. Antarct. 
141. t. 61. f. 3. Stems short, procumbent or suberect from a creeping rhi- 
zome, sparingly subpinnately branched ; branches straight or recurved. Leaves 
pale green, opaque, imbricate, secund, oblong or ovate-oblong, hardly acute, 
concave, obscurely toothed ; nerves 1-2, very short; periehsetial squarrose. 
Fruitstalk f in. long, quite smooth. Capsule cernuous, oblong ; operculum 
conic ; annulus large. Inflorescence dioecious. — Hypnum gracilescens, C. Muell. 
Stereodon, Mitten. 
Middle Island: Otago, Buchanan ; Nelson, Jolliffe. Lord Auckland’s group, 
J. D. H. (Tasmania.) Very similar in habit to Fterogonium filiforme. 
8. I. Menziesii, Hook./, and. Wils. Ft. N. Z. ii. 105. Stems stout, erect, 
2-5 in. high; fastigiately branched above; branches subumbellate, spreading. 
Leaves yellow-green, shining, lower squarrose, ovate-cordate, with very slender 
acuminate -.apices ; upper rather compressed, ovate, cuspidate, concave ; 
