Callipsygma J.Agardh, 1887

Holotype species: Callipsygma wilsonis J.Agardh

Original publication and holotype designation: Agardh, J.G. (1887). Till algernes systematik. Nya bidrag. (Femte afdelningen.). Acta Universitatis Lundensis 23(2): 1-174, 5 plates.

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Description: Thallus erect, uncalcified, to about 35 cm. tall, consisting of holdfast to 3 cm. across, relatively coarse and generally branched erect axes or stipes to ca. 1.5 cm. diameter but tapering upwards, and younger branches which bear finer complanate branches, thereby producing a dense, somewhat zonate, plumose appearance. Terminal branch systems tend to resemble small (0.5-1.5 cm. long) flabellae, are composed of predominantly dichotomously branched siphons which at times become laterally attached to adjacent siphons to produce essentially monostromatic flabellules, probably of limited growth. Main axes composed of branching siphons of broader diameter; compressed, seemingly darker colored, and almost concealed over part of their length by a covering, or loose cortex, produced by chains of short, appressed, dichotomously branched torulose siphons emanating from main siphons. Siphons contain both chloroplasts and amyloplasts, and at times acicular crystals; walls appears to lack cellulose. Modes of reproduction unknown.

Information contributed by: L. Hillis. The most recent alteration to this page was made on 2022-02-28 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 masculine.

Most recent taxonomic treatment adopted: Cremen, C.M., Leliaert, F., West, J.[A.], Lam, D.W., Shimada, S. Lopez-Bautista, J.M. & Verbruggen, H. (2019). Reassessment of the classification of Bryopsidales (Chlorophyta) based on chloroplast phylogenomic analyses. Molecular Phylogenetics and Evolution 130: 397-405, 2 figs.

Comments: Callipsygma is known only for subtropical sites in southeastern Australia, and Tasmania; it has been collected from heavily shaded pools from ca. -1 to -10m, and dredged at about -30m.

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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. 28 February 2022. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 27 September 2023

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