Cruoria Fries, 1835

Holotype species: Cruoria pellita (Lyngbye) Fries

Original publication and holotype designation: Fries, E.M. (1835). Corpus florarum provincialium Sueciae. I. Floram scanicam. pp. [i]-xxiv, [1]-394. Upsaliae [Uppsala]: typis Palmblad, Serell & C.

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Description: A monotypic family of one genus and two or three species. Plants are crustose, non-calcified, and consist of a single layered basal stratum from each cell of which erect, loosely aggregated filaments arise at nearly right angles to form a thick cushion. Anchoring rhizoids are absent, and neither secondary pit connections nor cell fusions are formed. Tetrasporangia are zonate, borne laterally on erect filaments, and are noteworthy for their comparitively large size. Gametophytes are monoecious. Carpogonial branches are 2-celled and lateral on ascending filamants, directly giving rise on fertilization to several connecting filaments that grow to undifferentiated auxiliary cells intercalary in separate erect filaments. Gonimoblasts arise on the connecting filaments themselves and develop both toward the interior and the surface of the thallus. Cystocarps are embedded without ostioles and consist mostly of carposporangia.

Information contributed by: G.T. Kraft. The most recent alteration to this page was made on 2017-01-23 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: Maggs, C.A. & Guiry, M.D. (1989). A re-evaluation of the crustose red algal genus Cruoria and the family Cruoriaceae. British Phycological Journal 24: 253-269, 44 figs, 3 tables.

Comments: Species forming Cruoria-like crusts but incorporating refractive cells and existing only as tetrasporophytes are strongly implicated as phases in the life histories of genera in other families, such as Halarachnion and Turnerella (Maggs and Guiry 1989). Distribution: The type species occurs in the eastern north Atlantic from Norway to Tangier. It is the most abundant subtidal non-calcified encrusting red alga in the British Isles (Maggs and Guiry 1989). A second species, C. cruoriaeformis (P. and H. Crouan), occurs on maerl in Britain, France, and possibly Corsica.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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. 23 January 2017. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 20 May 2024

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