Dictyothamnion A.J.K.Millar, 1990

Holotype species: Dictyothamnion saltatum A.J.K.Millar

Original publication and holotype designation: Millar, A.J.K. (1990). Marine red algae of the Coffs Harbour region, northern New South Wales. Australian Systematic Botany 3: 293-593, 76 figs, 2 tables.

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Description: Thallus with a small attachment disc and erect or arching fronds, divided into segments by multilayered septa and filled throughout with a watery mucilage. Axes terete, constricted at septa, branching variable. Construction multiaxial, producing a tubular inner cortex covered by an incomplete layer of smaller cells and lined inside by discrete parallel longitudinal filaments bearing inwardly-directed secretory cells adaxially and uniting with septa between the segments. Gametangial plants prpbably dioecious. Cystocarps protruding externally, most of gonimoblast transforming to carposporangia, arising directly from trunk-like fusion cell, enclosed within cortical pericarp without a pore. Tela arachnoidea present. Large tetrasporangia scattered in the younger parts, intercalary in cortical filaments. Spores tetrahedrally divided, polysporangia unknown.

Information contributed by: M.D. Guiry. 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: Millar's (1990) original description of the genus suggested that the combination of characters shown by Dictyothamnion are such that it could not be placed in either the Champiaceae or the Lomentariaceae. However, later molecular evidence (Saunders et al., 1999) subsequently placed it in the Champiaceae. The number of cells in the carpogonial branch is still unkown but is thus likely to be 4. Dictyothamnion saltatum is known only from New South Wales, Australia.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=42618

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 28 March 2024

 
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