Grateloup’s pimple weed (Dermocorynus montagnei)
|Researched by||Morvan Barnes||Refereed by||Admin|
|Authority||P.L.Crouan & H.M.Crouan, 1858|
|Other common names||-||Synonyms||Grateloupia montagnei P.L. Crouan & H.M. Crouan R.J. Wilkes, L.M. McIvor & Guiry 2005 , Grateloupia montagnei (P.L.Crouan & H.M.Crouan) R.J.Wilkes, L.M.McIvor & Guiry, 2005|
Dermocorynus montagnei is a non-coralline crustose alga. It is composed of horizontally expanded crusts and characteristic small erect reproductive papillae that seem randomly scattered over the surface of the crust. Mature papillae may be as much as 2 mm long and 0.5 mm broad. The papillae are not usually branched and are more or less terete and ovate when fully fertile. Depending on their type, the papillae may either be irregular or warty in nature. The crusts of Dermocorynus montagnei are strongly adherent to the substrate and have undulating and slighty irregular outlines. The crusts may be up to 220 µm thick and are generally brownish-red in colour, while the papillae are more purple in colour.
Recorded distribution in Britain and IrelandRecorded from western Scotland, south-west England, the Welsh coast and a small inlet of Kilkieran Bay, County Galway, Ireland. Possibly under recorded.
HabitatDermocorynus montagnei has been recorded growing as an epilithic crust on small, mobile stones and pebbles in shallow subtidal waters. More rarely has it also been observed growing on detached maerl fragments.
- Usually found on mobile stones and pebbles.
- Non-coralline crustose alga.
- Brownish-red crust and purple papillae.
- Terete and oval papillae.
Often confused with red seaweed of the genus Grateloupia, it can best be differentiated by its specific morphology, in particular papillae characteristics. However, much debate still exists as to its taxonomic classification and recent genetic analysis investigating molecular and morphological data has placed Dermocorynus montagnei in a sub-group of Gradeloupia (Wilkes et al., 2005).
Guiry, M.D., Maggs, C.A. 1982. The morphology and the life history of Dermocorynus montagnei Crouan frat. (Halymeniaceae; Rhodophyta) from Ireland. British Phycology Journal, 17, 215-228
Hardy, F.G. & Guiry, M.D., 2003. A check-list and atlas of the seaweeds of Britain and Ireland. London: British Phycological Society
Howson, C.M. & Picton, B.E., 1997. The species directory of the marine fauna and flora of the British Isles and surrounding seas. Belfast: Ulster Museum. [Ulster Museum publication, no. 276.]
Wilkes, R.J., McIvor, L.M. & Guiry, M.D., 2005. Using rbcl sequence data to reassess the taxonomic position of some Grateloupia and Dermocorynus species (Halymeniaceae; Rhodophyta) from the north-eastern Atlantic. European Journal of Phycology, 40, 53-60
This review can be cited as:
Last Updated: 27/03/2008