Scinaia Bivona-Bernardi, 1822

Holotype species: Scinaia forcellata Bivona-Bernardi

Currently accepted name for the type species: Scinaia furcellata (Turner) J.Agardh

Original publication and holotype designation: Bivona-Bernardi, A. (1822). Scinaia algarum marinarum novum genus.. L'Iride, Giornale di Scienze, Letteratura ed Arti per la Sicilia 1: 232-234, 1 pl..

Description: Gametophytes and tetrasporophytes heteromorphic. Gametophytes erect from discoid holdfasts, dichotomously branched. Axes soft or cartilaginous, noncalcified, terete, complanate or flat, constricted at the nodes or unconstricted, multiaxial. Medulla filamentous; inner cortical filaments dichotomously branched, pigmented; outer cortex includes large, colorless or weakly pigmented utricles; utricles interspersed with smaller pigmented cells or closely compacted to form a continuous surface. Monosporangia formed by pigmented cells at surface of branches. Monoecious or dioecious. Spermatangia in surficial sori. Carpogonial branches 3-celled, formed in inner cortex; prior to fertilization the hypogynous cell produces 2-4 sterile branches and the basal cell initiates pericarp filaments. Ostiolate cystocarps immersed in the branches. Gonimoblast filaments arise from the carpogonium; fusion cells form from the carpogonium and the hypogynous cell, with or without the basal cell (Huisman 1986), and basal cells of the gonimoblasts and sterile branches on hypogynous cell may also be incorporated (Hommersand & Fredericq 1990); carposporophyte compact, anchored basally in cystocarp; gonimoblast filaments terminate in chains of carposporangia. Tetrasporphytes filamentous; monsporangia sometimes present; tetrasporangia terminal on branched filaments, sometimes displaced laterally by sympodial branching, division of tetrasporangia cruciate, decussate or irregularly zonate, new sporangia sometimes proliferating within old sporangia.

Information contributed by: R.B. Searles. The most recent alteration to this page was made on 2017-01-20 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: Huisman, J.M., Harper, J.T. & Saunders, G.W. (2004). Phylogenetic study of the Nemaliales (Rhodophyta) based on large-subunit ribosomal DNA sequences supports segregation of the Scinaiaceae fam. nov. and resurrection of Dichotomaria Lamarck. Phycological Research 52(3): 224-234.

Comments: Intertidal and subtidal plants of temperate and tropical seas.

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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. 20 January 2017. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 19 May 2024

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