. British marine algae : being a popular account of the seaweeds of Great Britain, their collection and preservation. Marine algae. 154 BRITISH MARINE variably found growing on the long stems of Laminaria digitata (Fig. 46). Rhodymenia palmetta (Fig. 141) is a rarer and very much smaller plant. It rarely exceeds 2in. or 3in. in height and breadth. Its pretty little fronds are usually fan-shaped, and are divided rather numerously by repeated forkings, which are rounded at their axils, the tips being pointed. Fig. 142. Rhodymenia palmetta—var. Nicwensis. or tapered. The stem is long in so
. British marine algae : being a popular account of the seaweeds of Great Britain, their collection and preservation. Marine algae. 154 BRITISH MARINE variably found growing on the long stems of Laminaria digitata (Fig. 46). Rhodymenia palmetta (Fig. 141) is a rarer and very much smaller plant. It rarely exceeds 2in. or 3in. in height and breadth. Its pretty little fronds are usually fan-shaped, and are divided rather numerously by repeated forkings, which are rounded at their axils, the tips being pointed. Fig. 142. Rhodymenia palmetta—var. Nicwensis. or tapered. The stem is long in some specimens, but very short in others. Tubercles are borne near the tips of the segments or sometimes on their margins. Tetraspores are also produced in the terminal forks, and appear like little cloudy spots within the margins. This form of the species is usually parasitic on the stems of Laminaria digitata (Fig. 46). It is annual, and is found from May to August. The very pretty and distinct var. Nicceensis (Fig. 142) I have always found growing on rocks at extreme low-water mark. Our illustration was taken from a very perfect specimen found by me outside the Castle rocks at Hastings. In this species the fronds are tufted, and arise from a narrow horny stem ; the forkings are few, and the segments are cleft nearly to the base, each division being long, narrow, and rounded at the tips. The substance is at first very rigid, but it becomes soft and pliable in drying, and adheres very well to paper. The colour is brighter than that of the former plant, being of a beautiful rose-pink. The plant is a summer annual, and, like the fore- going, is widely distributed, but is usually considered a rarity, its diminutive size doubtless causing it to be frequently overlooked. Euthora cristata, which was formerly a Rhodymenia, is an extremely rare summer annual, found only on the northern coasts of this country, but pretty generally on the Scottish shores and at the Orkneys. This beautif
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