Plocamium J.V., 1813, nom. et typ. cons.
Holotype species: Plocamium vulgare J.V.Lamouroux
Currently accepted name for the type species: Plocamium cartilagineum (Linnaeus) P.S.Dixon
Original publication and holotype designation: Lamouroux, J.V.F. (1813). Essai sur les genres de la famille des Thalassiophytes non articulées. Annales du Muséum d'Histoire Naturelle, Paris 20: 21-47, 115-139, 267-293, pls 7-13.
Taxonomic status: currently recognized as a distinct genus.
Gender: This genus name is currently treated as neuter.
Most recent taxonomic treatment adopted: Huisman, J.M. (2018). Algae of Australia. Marine benthic algae of north-western Australia. 2. Red algae. pp. [i]-xii, 1-672, 189 figs. Canberra & Melbourne: ABRS & CSIRO Publishing.
Conserved type: Plocamium vulgare J.V.Lamouroux, not Fucus plocamium L. as listed by Athanasiadis (2016: 546). - (23 Jan 2017) - M.D. Guiry
Description: Thallus epilithic or epiphytic, erect, complanately branched, with the opposite margins bearing alternating series of 2 or 3 (–6) compressed lateral branches or ramuli; lower 1 (–3) ramuli usually unbranched with entire or serrate margins, occasionally recurved; uppermost ramuli branched and often continuing growth with the same pattern; growth of axes and main branches sympodial, the axes straight or somewhat flexuous; in P. leptophyllum small adventitious ramuli occurring on the opposite margin to the alternating series. Attachment by stoloniferous branchlets with small discoid holdfasts. Structure uniaxial, with a central row of elongate cells surrounded by a pseudoparenchymatous cortex with large inner cells decreasing to a small-celled outer cortex. Sexual thalli dioecious; procarpic. Carpogonial branches in the upper ramuli, adaxial, or in small axillary branchlets, borne on mid-cortical cells, 3-celled with the supporting cell functioning as the auxiliary cell. Cystocarps sessile or pedicellate in the axils of ramuli; carposporophyte with a small basal fusion cell and gonimolobes developing into clusters of ovoid carposporangia, with a cellular pericarp. Spermatangia cut off from surface cortical cells of ramuli or on axillary tufts of branchlets. Tetrasporangia in simple or branched elongate or clavate stichidia in the axils of upper ramuli, zonately divided. Life history triphasic with isomorphic gametophytes and tetrasporophytes [after Womersley (1994)].
Information contributed by: Huisman (2018).. The most recent alteration to this page was made on 26 Sep 2018 by M.D. Guiry.
Numbers of names and species: There are 81 species names in the database at present, as well as 27 infraspecific names. Of the species names, 45 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..
Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):
Click here to also show infraspecific names in the list below.
Womersley, H.B.S. (1971). The genus Plocamium (Rhodophyta) in southern Australia. Transactions of the Royal Society of South Australia 95: 9-27, 42 figs.
Schneider, C.W. & Wynne, M.J. (2013). Second addendum to the synoptic review of red algal genera. Botanica Marina 56(2): 111-118.
Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.
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.
Created: 28 December 2000 by M.D. Guiry
Verified by: 26 September 2018 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=27
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 26 June 2019.