| 词条 | Lemanea |
| 释义 |
| taxon = Lemanea | authority = Sirodot, non Bory | image = Lemanea na kamieniach w potoku.jpg | image_alt = Lemanea sp. in Polish mountain stream | image_caption = Lemanea sp. in Polish mountain stream }} Lemanea is a genus of freshwater red algae, in the order Batrachospermales. Both species are considered to be widespread in the northern hemisphere. Although placed in the Rhodophyta (red algae) it in fact is green in colour. DescriptionLemanea is a stiff bristle-like branched or unbranched alga similar to a coarse horsehair. Close inspection show it to have small swellings at more or less regular intervals along its length. It grows to 40 cm in length, in bunches in freshwater. It is blue-green to olive in colour when young. The asexual stage is a row of single-celled branched filaments.[1]SpeciesWorld-wide nine species are listed in algaebase:-
DistributionThe genus is considered to be cosmopolitan in the northern hemisphere. EuropeUnited KingdomThere are two species in the British Isles:-
IrelandThe records of this genus in Ireland are few with only three historic records from the north of Ireland in the Ulster Museum Herbarium (BEL). One collected by William Thompson in 1839; one collected by W. Sawers in 1856 and one collected in 1884 by H.W.Lett. These seem to be the earliest records from the north of Ireland. A more recent specimen collected in 1959 by Miss M.P.H. Kertland near Dungiven, Co. Londonderry is also preserved.[2] A further 16 specimens collected recently, that is within the last 50 years, have been added to the collection - all from Northern Ireland. We have one foreign specimen collected recently from the Faroes. Recently Lemanea fucina has been reported from Clare Island.[1] North AmericaIn North America two species in this genus are listed.[3]
Notes'A Lemanea species was found on slabs in the rapidly flowing streams in the NW of the Island'[4] References1. ^1 Guiry, M.D., John, D.M., Rindi, F. and McCarthy, T.K. (Edited) 2007. New Survey of Clare Island. Volume 6: The Freshwater and Terrestrial Algae. Royal Irish Academy. {{ISBN|978-1-904890-31-7}} 2. ^Morton, O. 1978. Lemanea in the North of Ireland. Irish Naturalists' Journal. 19: 206 3. ^Vis, M,L, and Sheath, R.G. 1992. Systematics of the freshwater red algael family Lemaneaceae in North America. Phycologia. 31: 164 - 179 4. ^Hibberd, D.J. in The Island of Mull a survey of its flora and environment. Ed A.C. Jermy and J.A. Crabbe. British Museum (Natural History) London. 1978 General references
Further reading
External links
3 : Batrachospermales|Red algae genera|Freshwater algae |
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