Amphisbetema Weber Bosse, 1913
Holotype species: Amphisbetema indica (J.Agardh) Weber Bosse
Original publication and holotype designation: Weber-van Bosse, A. (1913). Marine algae. Rhodophyceae, of the "Sealark" Expedition, collected by Mr. J. Stanley Gardiner, M.A.. Transactions of the Linnean Society of London, Second Series, Botany 8: 105-142, 1 fig, pls 12-14.
Request PDFDescription: Thallus with erect branching from decumbent rhizome-like base. Erect indeterminate axes sympodially developed and dorsiventrally organized, producing secondary branches from every sixth segment. Displaced primary axes adaxially producing from every second segment, 12 alternating dorsal and ventral short monopodial spine-like branches before halting growth. Indeterminate axes compressed and appearing winged in lower portions due to the overlap of spine-like branches on the margins. Short adventitious branches developing dorsally in the axils of some lateral branches, some of these becoming fertile. All axes ending in acute tips subtended by single swollen, undivided subterminal cells which often become deciduous, leaving the axes blunt. Axial cells surrounded by 6 periaxial cells in primary and secondary axes and as few as 4 in the tertiary axes. Periaxial cells quickly corticated by short descending rhizoidal filaments, collectively forming a thick cortex. Reproductive characteristics unknown. Several tetrahedral sporangia produced in successive whorls on pseudolaterals forming lanceolate stichidia with polysiphonous stalks. Tetrasporangia only partially enclosed.
Information contributed by: C.W. Schneider. The most recent alteration to this page was made on 2019-07-10 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
Most recent taxonomic treatment adopted: Díaz-Tapia, P., Pasella, M.M., Verbruggen, H. & Maggs, C.A. (2019). Morphological evolution and classification of the red algal order Ceramiales inferred using plastid phylogenomics. Molecular Phylogenetics and Evolution 137: 76-85, fig. 3.
Comments: Norris (1993) reported gland-like, densely staining cells near the tips of spine-like, terminal branches or near the distal end of polysiphonous axes bearing uniseriate tips. These cell are always produced singly.
A genus known only from the Indian Ocean—from the reefs off the Chagos and Aldabra Islands and Natal (South Africa).
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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=40421
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 10 July 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 26 November 2024
