163,902 species and infraspecific names are in the database, 22,783 images, 63,101 bibliographic items, 483,547 distributional records.

Species References

Polysiphonia nigrescens (Hudson) Greville ex Harvey

References
(Please note: only references with the binomials in the title are included. The information is from the Literature database.)

Pedersén, M.E.E., Roomans, G.M. & von Hofsten, A. (1981). Bromine in the cuticle of Polysiphonia nigrescens: localization and content. Journal of Phycology 17: 105-108.
Verlaque, M. & Riouall, R. (1989). Introduction de Polysiphonia nigrescens et d'Antithamnion nipponicum (Rhodophyta, Ceramiales) sur le littoral Méditerranéen Français. Cryptogamie, Algologie 10: 313-323.

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