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Asparagopsis armataGametophyte plants occurri from June or July - August or September (sometimes overwinteri), pale purplish-red, quickly degenerati when removed from the water and becomi distinctly orae; fronds bushy, with a cylindrical axis to1 mm wide and 200 mm lo, arisi from bare, creepi stolons; irregularly branched, with 4 rows of branchlets, simple, short, branchlets alternati with loer ones with 4 rows of simple filamentous ramuli. Lower branchlets unbranched, lo, tapered, with harpoon-like barbs. Tetrapsorophyte (Falkenbergia-phase) occurri all year round, but most obvious in October-March, brownish-red, much branched, filamentous, in dense cotton-wool-like tufts to 15 mm in diameter.
Location/common name:- Harpoon weed an alien species in Europe algue à crochets harpoon-alga red limu supreme limBoth phases readily reproduce vegetatively. Drift specimens of gametophyte readily attach to other algae by barbed branchlets, and produce new shoots. Introduced from the Southern Hemisphere, the gametophyte was first recorded in Europe in 1925 (Cherbourg and Biarritz), arrivi in the British Isles at Galway in 1941, and is now well established in open sandy pools of lower intertidal and subtidal, on rock or epiphytic (mainly on Ulva spp.) in the Channel Is, S Eland (Swanage to Scilly Is.) and S and W Irelan