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This is a dark green to black, almost rosette-forming ‘jelly lichen’ with very conspicuous swollen, squashy lobes, especially noticeable when moist. The reddish-brown discs (to 3mm diam.) are frequent. It occurs mostly on basic soils and clays and man-made substrata such as mortar. Its close relative, Collema tenax var. ceranoides, is distinguished by an abundance of narrow, thin, ascending lobes arising from spongy cushions often found embedded in paths and tracks, frequently in gardens. Both varieties are abundant in Ireland.
Original text submitted by Simon Davey