# Thorea

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***Thorea*** is a genus of [fresh water](/source/Fresh_water) algae in the division Rhodophyta ([red algae](/source/Red_algae)).[1] *Thorea* is a small alga with filaments up to 200 cm long, dark green in colour and not red as are marine Rhodophyta. The filaments have only as few secondary branches.

*Thorea* is distributed throughout temperate and tropical regions.[2]

The genus was [circumscribed](/source/Circumscription_(taxonomy)) by [Jean Baptiste Bory de Saint-Vincent](/source/Jean_Baptiste_Bory_de_Saint-Vincent) in Ann. Mus. Natl. Hist. Nat. vol.12 on page 126 in 1808.[3]

The genus name of *Thorea* is in honour of [Jean Thore](/source/Jean_Thore) (1762–1823), who was a French botanist and physician who practiced medicine in the town of [Dax](/source/Dax,_Landes).[4]

## Species

As accepted by [WoRMS](/source/WoRMS);[3]

- *[Thorea bachmannii](/source/Thorea_bachmannii)*
- *[Thorea brodensis](/source/Thorea_brodensis)*
- *[Thorea clavata](/source/Thorea_clavata)*
- *[Thorea conturba](/source/Thorea_conturba)*
- *[Thorea flagelliformis](/source/Thorea_flagelliformis)*
- *[Thorea gaudichaudii](/source/Thorea_gaudichaudii)*
- *[Thorea hispida](/source/Thorea_hispida)*
- *[Thorea okadae](/source/Thorea_okadae)*
- *[Thorea okaidai](/source/Thorea_okaidai)*
- *[Thorea prowsei](/source/Thorea_prowsei)*
- *[Thorea riekei](/source/Thorea_riekei)*
- *[Thorea siamensis](/source/Thorea_siamensis)*
- *[Thorea violacea](/source/Thorea_violacea)*
- *[Thorea zollingeri](/source/Thorea_zollingeri)*

Former species;[3]

- *Thorea andina* accepted as *Thorea hispida* (synonym)
- *Thorea chilensis* accepted as *[Myriogloea chilensis](/source/Myriogloea_chilensis)* (synonym)
- *Thorea lehmannii* accepted as *Thorea hispida* (synonym)
- *Thorea ramosissima* accepted as *Thorea hispida* (synonym)

## *Thorea* in UK

There is only one species of *Thorea* in the [British Isles](/source/British_Isles): *Thorea hispida* (Synonyms: *Thorea anadina* , *T. lehmannii* and *T. ramosissima* ).[1]

The first record of *Thorea ramosissima* in the British Isles is in Harvey's Manual (1841):[5] *Found in a pool in a bog in the [County Donegal](/source/County_Donegal) Mountains, going from Letterkenny to Dunfanaghy; July*. These specimens are in the [Ulster Museum](/source/Ulster_Museum) (BEL: F42–F47), but proved to have been incorrectly identified and were specimens of *[Batrachospermum](/source/Batrachospermum)*.[6]

## References

1. R. G. Sheath & A. R. Sherwood (2002). "Phylum Rhodophyta". *The Freshwater Algal Flora of the British Isles*. D. M. John, B. A. Whitton & A. J. Brook (ed.). [Cambridge University Press](/source/Cambridge_University_Press). Cambridge. ISBN 0-521-77051-3.

1. D. M. John, L. R. Leslie & J. A. Moore (1989). "Observations on *Thorea ramosissima* Bory (Batrachospermales, Thoraceae), a freshwater red alga rarely recorded in the British Isles". *Br. Phycol. J.*. **24**: 99–102. [doi:10.1080/00071618900650091](https://doi.org/10.1080/00071618900650091)

1. ["WoRMS - World Register of Marine Species - Thorea Bory de Saint-Vincent, 1808"](https://www.marinespecies.org/aphia.php?p=taxdetails&id=381052). *www.marinespecies.org*. Retrieved 17 November 2022.

1. Burkhardt, Lotte (2022). [*Eine Enzyklopädie zu eponymischen Pflanzennamen*](https://doi.org/10.3372/epolist2022) [Encyclopedia of eponymic plant names] (pdf) (in German). Berlin: Botanic Garden and Botanical Museum, Freie Universität Berlin. [doi:10.3372/epolist2022](https://doi.org/10.3372/epolist2022). ISBN 978-3-946292-41-8. Retrieved January 27, 2022.

1. W. H. Harvey (1841). [*A Manual of the British Algae:...*](https://archive.org/details/b29306000). John van Voorst, London.

1. D. M. John, J. A. Moore & L. R. Johnson (1990). "The red alga *Thorea* in the British Isles". *Br. Phycol. Newsletter*. **28**: 11–12.

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Adapted from the Wikipedia article [Thorea](https://en.wikipedia.org/wiki/Thorea) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Thorea?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.