Dictyomenia Greville, 1830
Lectotype species: Dictyomenia tridens (Mertens ex Turner) Greville
Original publication: Greville, R.K. (1830). Algae britannicae, or descriptions of the marine and other inarticulated plants of the British islands, belonging to the order Algae; with plates illustrative of the genera. pp. [i]-lxxxviii, [1]-218, pl. 1-19. Edinburgh & London: McLachlan & Stewart; Baldwin & Cradock.
Request PDFType designated in: Schmitz, F. (1889). Systematische Übersicht der bisher bekannten Gattungen der Florideen. Flora oder Allgemeine botanische Zeitung 72: 435-456, pl. XXI.
Description: Upright, large polysiphonous thalli, up to 50 cm tall, with many branches, each comprised of axes with 6 pericentral cells, 2 opposite pericentrals dividing to form alae with single large-celled layer covered by small-celled cortical cells; corticated axes forming conspicuous midribs and veins. Plants attached by discoid holdfast or cylindrical haptera. Major branch apices not involute and forming exogenous branches in regular, usually alternate positions. Lateral veins ending in dentate or serrate projections on blade margins. Lateral major branches formed in regular or irregular marginal positions from tips of veins, other veins remaining determinate. Trichoblasts rare. Reproductive structures on marginal teeth or in adventitious branchlets on thallus surface above midrib or veins. Tetrasporangia in simple or branched stichidia, 1 per segment, often causing segments to swell. Cystocarps spheroid to ovoid, on 2nd segment of rudimentary trichoblasts on short fertile branchlets. Spermatangia unknown.
Information contributed by: R.E. Norris. The most recent alteration to this page was made on 2010-10-06 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: Often common in western and southern Australia (Fuhrer and others 1981), a single species in 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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera,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=35638
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 06 October 2010. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 18 April 2024
