Abstract
Oosting (1948) figures anad describes these 'peculiar dark concentric rings of dead or dying moss', together with isolated rinags of living moss which he finds to be a growth form of the 'eroded Rhacomitrietum' type (Watt, 1947), and implies that these concentric dead rings also are a feature of the growth habit of the moss. Russell & Wellington (1940) state: 'It was frequently observed on unbroken areas of moss that there were narrow bands of dead tissue. Such bands formed a variable pattern of circles and curves. It is difficult to offer an explanation of these as their form excluded * Botanical results of the Oxford University Expedition to Jan Mayen, 1947, and the Jan Mayen Expedition, 1950, no. 1.
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