Nudresdaya M.Hoshino, A.R.Sherwood & Kogame, 2024

Holotype species: Nudresdaya littleri (I.A.Abbott) M.Hoshino, A.R.Sherwood & Kogame

Original publication and holotype designation: Hoshino, M., Wakeman, K.C., Kato, A., Kitayama, T., Sherwood, A.R., Uwai, S. & Kogame, K. (2024). Taxonomic study of the polyphyletic Dudresnaya (Dumontiaceae, Florideophyceae) with descriptions of Dudresnaya ryukyuensis sp. nov. and two new genera, Himehibirhodia and Nudresdaya. Phycological Research 72: 133–148, 9 figures, 1 table.

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Description: The gametophytes are erect, pale red in color uniaxial, cylindrical, narrow and irregularly branched. Texture is very soft, gelatinous and lubricous. The cortical fascicles are branched dichotomously. The distal cells of the cortical fascicles are oval to obpyriform and the proximal cells are cylindrical. The gametophytes are dioicous. The spermatangia are produced at the distal end of the terminal cells of the cortical fascicles, or form corncob-like spermatangial structures. The carpogonial branches are 6–10 celled including the basal cell, and strongly crooked near its terminal end. The auxiliary cell branches are 10–16 celled of which the 4–6 cells are enlarged and rounded, and the auxiliary cell is the second of the enlarged cells from the proximal end. After fertilization, the carpogonium fuses with the fourth cell (counting from the terminal carpogonium) of the carpogonial branch by an extremely short primary connecting filament, and resulting fusion complex cuts off a second primary connecting filament fusing with the fifth cell. The resulting two fusion complexes cut off secondary connecting filaments to the auxiliary cells. The trichogyne degenerates and disappears during the postfertilization development. The carposporophytes are up to 430 µm in diameter. The released carpospores are 24 µm in diameter. The tetrasporophytes are isomorphic to the gametophytes. Tetrasporangia are zonately divided.

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 2024-07-10 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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=55210

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 10 July 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 04 December 2024