Chrysonephos W.R.Taylor, 1952

Holotype species: Chrysonephos lewisii (W.R.Taylor) W.R.Taylor

Original publication and holotype designation: Taylor, W.R. (1952). The algal genus Chrysophaeum. Bulletin of the Torrey Botanical Club 79(1): 79.

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Description: Thallus filamentous, dichotomously forked, in clumps reaching one-4 cm high. Holdfast inconspicuous, consisting of a few-celled prostrate filament developing one erect axis. Filaments uniseriate, with some oblique divisions causing older axes to become irregularly pluriseriate. Filaments 30-48 &m in diam. below, tapering to 5-12 &m near the tips. Cells cylindrical, thin-walled, filaments limited by a gelatinous envelope, up to 12 &m in thickness. Two to 4, yellowish-brown, oval to band-shaped chloroplasts, each with a bulging pyrenoid. Zoospores produced after rounding up of the cells and dissolution of the cell walls, usually in the last 2 or 3 forks of the plant, with no morphologically distinct sporangia. Zoospores pyriform (6-7 ( 8-9 &m) with one forwardly directed flagellum bearing tripartite mastigonemes, and a smooth, trailing shorter flagellum. No stomatocysts nor sexual reproduction observed. Warm-water organism growing on various supports, from lower water to Æ45 m depth. Originally described from the western Atlantic (Florida and Bermuda), more recently found in islands of the western Pacific and in the Mediterranean where it can be locally abundant at certain times of the year.

Information contributed by: C. Billard. The most recent alteration to this page was made on 2021-10-08 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: Kristiansen, J. & Preisig, H.R. (2001). Encyclopedia of Chrysophyte genera. Bibliotheca Phycologica 110: 1-260.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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. 08 October 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 30 November 2023

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