Polysiphonia fibrillosa
Polysiphonia fibrillosa Sprengel is a species of marine red alga in the Rhodophyta.
Description
Polysiphonia fibrillose is a fine red alga which grows to 25 cm long. The erect cylindrical branches are themselves branched and are attached by a discoid holdfast. The branches consist of a central axis of cells each surrounded by 4 pericentral cells of equal length and all elongate and of the same length. Corticating filaments grow down in the grooves between the pericentral cells. Rhizoids grow from the pericentral cells. Trichoblasts are numerous.Other similar species include: P. rhunensis Thuret et Bornet, P.orthocarpa Rosenvinge. P.sertularioides and P.sanguinea C.Agardh.