Thamnoclonium Kützing, 1843

Holotype species: Thamnoclonium hirsutum Kützing

Currently accepted name for the type species: Thamnoclonium dichotomum (J.Agardh) J.Agardh

Original publication and holotype designation: Kützing, F.T. (1843). Phycologia generalis oder Anatomie, Physiologie und Systemkunde der Tange. Mit 80 farbig gedruckten Tafeln, gezeichnet und gravirt vom Verfasser. pp. [part 1]: [i]-xxxii, [1]-142, [part 2:] 143-458, 1, err.], pls 1-80. Leipzig: F.A. Brockhaus.

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Description: Terete to distinctly flattened, subdichotously and abundantly branched, covered with irregularly contoured protuberances. Cartilaginous. Stalk cylindrical, perennial, with growth rings. Holdfast discoid. Medulla filamentous. Refractive medullary cells present in some species. Cortex of branched files of isodiametric to oblong cells, progressively smaller toward cuticle. Secondary pit connections present. Some species associated with sponges. Reproductive structures borne in special proliferations in upper part of thallus, simple, branched or tufted, with a smooth, lobed or toothed margin. Ampullae branched to two or three orders. Carpogonial branch 2-celled, on the primary ampullar filament. Hypogynous cell bearing a short lateral filament. Auxiliary cell in a separate ampulla, the lowermost cell of a secondary ampullar filament or an intercalary cell of the primary filament. A single, outwardly directed gonimoblast initial producing a compact cystocarp of many small carposporangia. Small auxiliary fusion cell formed. Pericarp of ampullar and adjacent cortical cells. Carpostome absent. Spermatangia superficial, cut off by oblique walls. Tetrasporophyte isomorphic. Tetrasporangia small, cruciate, immersed in cortex.

Information contributed by: S.C. Lindstrom & J.A. Lewis. The most recent alteration to this page was made on 2010-10-08 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Most recent taxonomic treatment adopted: Schneider, C.W. & Wynne, M.J. (2007). A synoptic review of the classification of red algal genera a half a century after Kylin's "Die Gattungen der Rhodophyceen". Botanica Marina 50: 197-249.

Comments: Strictly subtidal. Southeastern, southern and western Australia, the Philippines, Indonesia, West 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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=34424

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 08 October 2010. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 22 November 2024