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Polysiphonia japonica : ウィキペディア英語版
Polysiphonia

''Polysiphonia'' is a genus of red alga with about 19 species on the coasts of the British Isles 〔 and about 200 species world-wide, including Crete in Greece, Antarctica and Greenland.  Its members are known by a number of common names.〔Recorded common names are olann dhearg, craonach, cúnach triosgar, cluaisíní, mileara, millreacha, salata tou yialou (σαλάτα του γιαλού) and lobster horns.〕〔 It is in the Order Ceramiales and Family Rhodomelaceae. 
==Description==
''Polysiphonia'' is a red alga, filamentous and usually well branched, with some plants reaching a length of about 30 cm. They are attached by rhizoids or haptera 〔 to a rocky surface or other alga. The thallus (tissue) consists of fine branched filaments each with a central axial filament supporting pericentral cells. The number of these pericentral cells, 4–24, is used in identification.  ''Polysiphonia elongata''  shows a central axial cell with 4 periaxial cells with cortical cells growing over the outside on the older fronds. 〔 Its cuticle contains bromine.
Features used in identification include the number of pericentral cells, the cortication of main branches, constriction of young branches at their base, whether the branching dichotomous or spiral, and the width and length of thalli.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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