Pylaiella littoralis (Linnaeus) Kjellman
Description: Thallus filamentous, up to 200
(-500) mm long. Erect vegetative system of branched uniseriate
filaments; branching irregularly opposite. Occasional
longitudinal cell divisions. Basal system of free
filaments and rhizoids. Many discoid chloroplasts per
cell. Unilocular sporangia intercalary, sometimes terminal;
plurilocular sporangia also intercalary, sometime terminal.
Habitat: Intertidal to shallow subtidal;
epilithic or epiphytic, particularly on fucoids (particularly
Ascophyllum nodosum). Occurs in marine and estuarine conditions.
Key characteristics: Rope-like appearance;
tolerance of emersion.
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