Go to National Library of New Zealand Te Puna Mātauranga o Aotearoa
Volume 77, 1948-49
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(D) Banks of Clay or Sand.

The rapid weathering of freshly exposed granitic rock in roadside cuttings or on maritime banks produces a clay which is soon peopled with seedling forest trees, ferns, lichens, and bryophytes. Of the mosses, much the most characteristic is Polytrichadelphus magellanicus, which here, as on the mainland, is almost invariably associated with one or more species of Campylopus—in. this case C. clavatus as a rule. Two other common mainland associates, viz. Pogonatum subulatum and Polytrichum juniperinum, are rather rare in Stewart Island. Ditrichum flexifolium and less frequently D. punctulatum are two clay-bank mosses found most commonly in recesses in the

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bank, or on the underside of projecting ledges. Where the bank is peaty, Orthodontium sulcatum is more common than I have seen it elsewhere in New Zealand; where it is kept perpetually moist by seepage, Breutelia pendula, Hypopterygium novae-seelandiae, Philonotis tenuis, or less frequently Webera tasmanica may be expected. Damp banks, especially those with a southern aspect or not exposed greatly to direct sunshine, may have a complete cover of hepatics and be tinged either green or more commonly red. Two common associations leading to this result are Jungermannia inundata and Cephaloziella. sp. (e.g. near Golden Bay wharf) and Isotachis montana and Balantiopsis diplophyllum (frequent near Oban).

Other hepatics occurring in this station include Jamesoniella sonderi, Metzgeria hamata, Chiloscyphus echinellus, and even in damp places Monoclea forsteri or Marchantia, cephaloscypha ?, but many others not catalogued might be added.

Sandy banks near the seashore have quite a distinct florula from the clay banks, hepatics being few, and mosses usually from the following list: Eriopus apiculatus (common), Weisia viridula, Barbula australasiae, Tortella calycina, Brachythecium rutabulum, Thuidium furfurosum, Polytrichum juniperinum, Ceratodon purpureus, or Acrocladium auriculatum. Cockayne records Rhacomitrium lanuginosum var. pruinosum from the sand-dunes near Mason Bay. Bryum caespiticium occurs on sand, but flat soil rather than sandy banks. Mr. Cedric Smith has recently obtained Pottia heimii on a sandy bank on Bravo Island in Paterson's Inlet.