Croisettea M.J.Wynne, 2018

Holotype species: Croisettea requienii (J.Agardh) M.J.Wynne

Original publication and holotype designation: Wynne, M.J. (2018). Regarding Kallymenia J.Agardh, 1842, Euhymenia Kützing nom. illeg. 1843, and the proposal of Croisettea gen. nov. (Kallymeniaceae, Rhodophyta). Notulae Algarum 76: 1-4.

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Description: Thallus a blade, membranous to tough consistency, ranging from broadly foliose to slightly lobed or deeply lobed, with strap-shaped branches (as in C. australis); stipitate at base; cortex of 2-3 layers of small cells at surface and one or two layers of elongated cells internal to outer cortex; medulla filamentous and laxly organized, consisting of a plexus of narrow filaments and stellate cells; nonprocarpic; carpogonial-branches and subsidiary cells are elongate; carpogonial branch 2- or 3- celled; the supporting cell is variable, carpogonial branch system being monocarpogonial in C. requienii and C. tasmanica, but polycarpogonial in C. australis. Fusion cells, where observed, are conspicuous, deeply lobed, incorporating both the supporting and subsidiary cells and producing long connecting filaments. Auxiliary cell bearing up to 6 subsidiary cells; gonimoblast filament developing from the auxiliary cell or from the connecting filament near the site of fusion with auxiliary cell. Branched chains of carposporangia are formed. Tetrasporangia scattered in outer cortex.

Origin of description: this description is from the original publication; it may have been modified slightly. The most recent alteration to this page was made on 2022-12-17 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.

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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=52619

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 17 December 2022. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 18 April 2024