Lomentaria Lyngbye, 1819

Holotype species: Lomentaria articulata (Hudson) Lyngbye

Original publication and holotype designation: Lyngbye, H.C. (1819). Tentamen hydrophytologiae danicae continens omnia hydrophyta cryptogama Daniae, Holsatiae, Faeroae, Islandiae, Groenlandiae hucusque cognita, systematice disposita, descripta et iconibus illustrata, adjectis simul speciebus norvegicis. pp. [i]-xxxii, [1]-248, 70 pls. Hafniae [Copenhagen]: typis Schultzianis, in commissis Librariae Gyldendaliae.

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Description: Thallus usually erect, sometimes arching or partly prostrate, terete or compressed, filled throughout with a watery mucilage, sometimes constricted into regular segments, branching variable, non-deciduous; multiaxial construction, cortex tubular, composed of 3-6 cell layers lined inside with a network of medullary cells bearing inwardly-directed secretory cells and compacted into a plug at constrictions and/or branch bases, monostromatic septa absent.Gametangial plants dioecious; spermatangia in superficial sori, terminal on mother cells derived from cortical cells; procarpic, carpogonial branches 3-celled, with one or two (one non-functional) 2-celled auxiliary cell branches, gonimoblast developing outwards from a columnar fusion cell, most cells forming carposporangia, tela arachnoidea poorly developed, cystocarps scattered, protruding externally, with a prominent pore; tetrasporangia terminal on cortical filaments, in sori in depressions formed by invagination of cortex, tetrahedral, polysporangia unknown.

Information contributed by: M.D. Guiry. The most recent alteration to this page was made on 2017-01-24 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Schneider, C.W. & Wynne, M.J. (2007). A synoptic review of the classification of red algal genera a half a century after Kylin's "Die Gattungen der Rhodophyceen". Botanica Marina 50: 197-249.

Comments: L. articulata and some other species have the multilayered plugs constricting the medullary cavity at regular intervals and have terete thalli. Others, such as L. clavellosa and L. orcadensis , have plugs only occurring only at the bases of the branches, the fronds have an unconstricted appearance, and are compressed or flattened. Guiry in Irvine & Guiry (1983) suggested removal of this latter series to a separate genus, Chondrothamnion K├╝tzing (1843: 438). The relationship between species of Binghamiopsis (q.v.) and the flattened, unconstricted species of Lomentaria needs further study, and the relationships between Coelothrix, Binghamia, and Binghamiopsis (q.v.) need clarification. Spore germination and frond development have been described in detail by Boillot (1961). L. articulata and L. clavellosa from the British Isles (Guiry unpubl.), and L. hakodatensis from Korea (Lee & West 1980) have Polysiphonia-type life histories. However, L. orcadensis tetraspores from Irish plants give rise repeatedly to new tetrasporangial plants (Foran & Guiry 1983; Guiry unpubl.). Chromosome numbers of n = 10 and 2n = 20 have been reported in L. articulata (Magne 1964), L. baileyana (Cole 1990), and L. clavellosa (Svedelius 1935, 1937), although Magne (1964) found n = 22 or 23 and 2n = 44 or 46 in the latter species. In L. orcadensis Magne (1964) and Svedelius (1935, 1937) reported that tetrasporangial plants had 20 chromosomes, although Magne (1964) found some populations with 10. Although L. hakodatensis is said (Dawson 1963) to be distributed from southern California south to Costa Rico, South (1968) reported plants from Washington, and it is now found in the Strait of Georgia and Barkley Sound on the west coast of Vancouver I. and in northern Washington, giving rise to speculation that it may have been introduced with oysters from Japan (Hawkes & Scagel 1986). Cabioch & Magne (1987) also report the occurrence of this species in northern France in circumstances that are suggestive of a similar introduction. Lomentaria species are poorly known. The genus is widespread, but less common in tropical and polar seas.

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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 24 January 2017. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 22 February 2024

 
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