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(B). Rocks in the Open.
(a) Lowland Rocks. Mosses practically restricted to this sub-stratum are few in number in Stewart Island — Rhacomitrium crispulum and its variety rupestre (not observed by me), Grimmia trichophylla, and Zygodon menziesii—but many others not so restricted occur. Of these, Sematophyllum tenuirostre is almost limited to rocks emergent from the water in a stream-bed and in good light. Barbula australasiae is a plant of rocky banks and stone walls, while Campylopus introflexus, C. clavatus, or C. appressifolius are amongst the commonest rupestral mosses. Breutelia pendula is abundant on perpetually moist rocks, and Polytrichum juniperinum and Poly trichadelphus magellanicus abound on distintegrating rock on the sides of banks and cuttings. In dry stations one finds Ceratodon purpureus and Funaria hygrometrica and on damp, somewhat shaded rock faces Fissidens asplenioides and Catagonium politum, often with the hepatic Metzgeria hamata. Maritime rocks are the optimum station for Macromitrium longirostre. Hepatics are rare on lowland rocks exposed to full sunlight save near running water from which species of Riccardia and Ghioscyphus with others are rarely absent.
(b) Subalpine rocks. Rocks exposed at altitudes above the upper forest margin have a much more numerous list of associated bryophytes, of which 50% are hepatics, a reflex of the prevailing moistness
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of the atmosphere and freedom from drought. The following is a list of bryophytes collected on and near the summit of Mount Anglem (3,200ft.).
Mosses: Andreaea acutifolia, Breutelia elongata, B. pendula, Acrocladium auriculatum, Camptochaete gracilis, Campylopus clavatus, C. introflexus, Dicranoloma billardieri, D. robustum var. setosum, D. integrifolium, Holomitrium perichaetiale, Rhacocarpus australis, Rhacomitrium lanuginosum var. pruinosum, Stereodon cupressiforme, Thuidium furfurosum.
Hepatics: Chandonanthus squarrosus, Chiloscyphus menziesii, Goebeliella urnigera, Gymnomitrium stygium, Herberta alpina, Jamiesoniella colorata, J. sonderi, Isotachis montana, Lepicolea scolo-pendra, Lepidolaena clavigera, Plagiochila circinalis, P. conjugata, P. sp., Radula uvifera, Riccardia sp.
On Table Hill, the subalpine rocks have a similar flora save that Andreaea acuminata replaces A. acutifolia, while Camptochaete gracilis and Thuidium furfurosum were not observed. On the other hand, the following, not seen on Mount Anglem, were gathered: Dicranoloma grossialare, Sematophyllum tenuirostre, and Dendro-ligotrichum dendroides, this last in rock crevices near the summit and far removed from any forest cover. With it grew Plagiochila ramosissima, a hepatic also normally growing in forest. On wet rocks emergent from bog Isotachis montana and I. gigantea were taken, the latter also in Sphagnum bog and on rocks margining a subalpine stream.