Polysiphonia nigra

Polysiphonia nigra
Scientific classification
(unranked):	Archaeplastida
Division:	Rhodophyta
Class:	Florideophyceae
Order:	Ceramiales
Family:	Rhodomelaceae
Genus:	Polysiphonia
Species:	P. nigra
Binomial name
	Polysiphonia nigra; (Hudson) Batters

Polysiphonia nigra is a species of marine alga in the division Rhodophyta.

Description

Polysiphonia nigra is a relatively small red algae which grows to a height of 20 or 30 cm. It consists of tufts of branched axes. The branches are cylindrical and erect, consisting of large axial cells forming about one third of the diameter of the branch, surrounded by periaxial cells in a collar around the axis, each cell of the same length, generally 9 - 13 in number. Cortication absent. Attached by rhizoids.[1][2]

Reproduction

The plants are dioecious with spermatrangial branchlets borne near the apices of the branches. Cystocarps are globular with a small ostiole. Tetrasporangia are arranged in short lateral branches.[1]

Distribution

Generally to be found around the British Isles and in Europe from Norway to Portugal. In America - Newfoundland to New Jersey.[1]

References

Maggs, C.A. 1993. Seaweeds of the British Isles Volume 1 Rhodophyta Part 3A Ceramiales The Natural History Museum, London
Bunker, F.StPD., Maggs, C.A.Brodie, J.A., Bunker, A.R. 2017. Seaweeds of Britain and Ireland. Second Edition. Wild Nature Press. Plymouth, UK. ISBN 978-0-9955673-3-7

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[Maggs_93-1] Maggs, C.A. 1993. Seaweeds of the British Isles Volume 1 Rhodophyta Part 3A Ceramiales The Natural History Museum, London

[Bunker-2] Bunker, F.StPD., Maggs, C.A.Brodie, J.A., Bunker, A.R. 2017. Seaweeds of Britain and Ireland. Second Edition. Wild Nature Press. Plymouth, UK. ISBN 978-0-9955673-3-7