Plocamium J.V.Lamouroux, 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 20: 21-47, 115-139, 267-293, plates 7-13.

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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 2018-09-26 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 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.

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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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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 26 September 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 16 April 2024

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