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RHODOPHYTA (red algae)
Polysiphonia nigrescens
(Hudson) Greville,, 1833
Lenght
: ~20 cm
Width:
0.1-1 mm
Thallus
thin filiform, firm to coarse, bushy, dark purple to black. Pericentral cells 12-20. Litophyte and epiphyte. In sublittoral, mainly in sheltered localities.Rare, boreal species.