Polysiphonia simulansPolysiphonia simulans is a small marine alga in the division Rhodophyta.DescriptionThis small alga is no more than 8 cm long. It appears as a tuft of irregularly branched erect axes. The branches show 10 periaxial cells forming a collar around a central axis without cortication. The pericentral cells are all of the same length. Rhizoids are attached to the lower periaxial cells.ReproductionTetraspores have been recorded in the final branches.DistributionRecorded from the south coast of England, Ireland and the Channel Islands. Also recorded from north-west France. Occurs southwards to Morocco.