Seirospora Harvey, 1846

Holotype species: Seirospora griffithsiana Harvey

Currently accepted name for the type species: Seirospora interrupta (Smith) F.Schmitz

Original publication and holotype designation: Harvey, W.H. (1846). Phycologia britannica, or, a history of British sea-weeds: containing coloured figures, generic and specific characters, synonymes, and descriptions of all the species of algae inhabiting the shores of the British Islands. pp. Text with plates, pls I-LXXVIII. London: Reeve & Benham.

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Precise date of publication: April 1846

Description: Thallus erect, filamentous, ecorticate or with sparse rhizoidal cortication below, with a single lateral branch per axial cell arranged in an alternate-distichous or spiral pattern. Cells uninucleate. Spermatangia in short tufts, adaxial on lateral branches. Procarps on intercalary cells of major axes. Carposporophyte with branched gonimolobes composed almost entirely of carposporangia, generally with terminal chains of carposporangia, without an enveloping involucre but with accessory filaments arising from axial cells below the gonimoblast. Tetrasporangia sessile, tetrahedrally divided. Seirospores present or absent.

Information contributed by: Huisman (2018). The most recent alteration to this page was made on 2021-09-06 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: Hommersand, M.H., Freshwater, D.W., Lopez-Bautista, J.M. & Fredericq, S. (2006). Proposal of the Euptiloteae Hommersand et Fredericq, trib. nov. and transfer of some southern hemisphere Ptiloteae to the Callithamnieae (Ceramiaceae, Rhodophyta). Journal of Phycology 42: 203-225.

Comments: Distinguished from Callithamnion mainly by uninucleate cells, structure of carposporophyte and presence of terminal seirospores.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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. 06 September 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 09 December 2023

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