Meredithia J.Agardh, 1892

Lectotype species: Meredithia microphylla (J.Agardh) J.Agardh

Original publication: Agardh, J.G. (1892). Analecta algologica. Lunds Universitets ÅrsSkrift, Andra Afdelningen, Kongl. Fysiografiska Sällskapets i Lund Handlingar 28(6): 1-182, 3 pls.

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Type designated in: Schmitz, F. & Hauptfleisch, P. (1897). Gigartinaceae. In: Die natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten insbesondere den Nutzpflanzen unter Mitwirkung zahlreicher hervorragender Fachgelehrten, Teil 1, Abteilung 2. (Engler, A. & Prantl, K. Eds), pp. 352-366. Leipzig: verlag von Wilhelm Engelmann.

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Description: Semi-peltate, auriculate blades, sometimes lobed, initially soft but becoming cartilaginous, borne ramisympodially on a terete, basally branched stipe. Perennial. Medulla filamentous, compact; stellate cells present. Cortex of subspherical cells, progressively smaller toward cuticle. Dioecious. Carpogonial branch 3-celled, borne singly on elongate, occasionally lobed supporting cell, which bears one or two subsidiary cells. Cystocarps initially embedded, becoming protuberant with age. Spermatangia superficial, in sori in center of blade. Tetrasporophyte heteromorphic, crustose. Tetrasporangia formed under short-day conditions and only at temperatures around 15ªC in a mucilaginous sorus, irregularly to regularly zonate, attached basally. Spore germination: within spore wall, resultant cell(s) producing one or more filamentous outgrowths, which become highly ramified to form a compact monostromatic disc.

Information contributed by: S.C. Lindstrom. The most recent alteration to this page was made on 2021-09-09 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: Saunders, G.W., Huisman, J.M., Vergés, A., Kraft, G.T. & Le Gall, L. (2017). Phylogenetic analyses support recognition of ten new genera, ten new species and 16 new combinations in the family Kallymeniaceae (Gigartinales, Rhodophyta). Cryptogamie Algologie 38(2): 79-132, 126 figs.

Comments: Subtidal. Temperate waters of the North Atlantic and Mediterranean.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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. 09 September 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 19 June 2024

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