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Sphaerococcus coronopifolius, Stackh

Sphaerococcus coronopifolius, Stackh

Abstract

University Scholar in Botany, Demonstrator of Botany in the Normal School of Science, Kensington. Downloaded from aob.oxfordjournals.org at Infovell on November 13, 2010 With Plate XVIII. VEGETATIVE THALLUS. H E red sea-weed Sphaerococcus coronopifolius, Stackh., occurs, in England, along the south-west coast from the Isle of Wight to Land's End, being found attached to rocks at extreme low-water and deeper levels, by means of a disc-like ' root,' from which one to three main ' stems' arise. The main stem produces irregularly placed branches, from which very numerous short upwardly directed branchlets spring. These alternate or subdichotomously formed branchlets are flattened and relatively wide, and have the whole length of their two edges closely beset with small cylindrical filaments, often themselves slightly branched (Fig. i). The whole plant may be a foot long, and as broad as it is long. Each cylindrical filament repeats on a smaller scale the structure of its parent branchlet, and this of its parent branch (Fig. 2). Running through the middle of the filament is a central axis consisting of a uniseriate row of large tubular cells in which the usual Floridean characters are wellmarked. From the distal end of each joint-cell of
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