Digeneopsis R.H.Simons, 1970

Holotype species: Digeneopsis subopaca Simons

Currently accepted name for the type species: Halopithys subopaca (Simons) L.E.Phillips & De Clerck

Original publication and holotype designation: Simons, R.H. (1970). Marine algae from southern Africa. 1. Six new species from the inter- and infra-tidal zones. Investigational Report Division of Sea Fisheries South Africa 88: [3], 1-13, 11 figs.

Description: Upright cylindrical polysiphonous thalli, attached by a discoid holdfast; erect axis unbranched to sparsely branched, up to 4 cm high, corticated and thickly clothed with determinate branchlets which are sometimes simple, bi- or trifurcate, cylindrical, covered by 1 layer of cortical cells. Pericentral cells 5. Tetrasporangia, 2 per segment, in lateral stichidia on determinate branchlets. Gametophyte reproduction unknown.

Information kindly contributed by R.E. Norris but may now be outdated.

Taxonomic status: This name is currently regarded as a synonym of Halopithys.

Most recent taxonomic treatment adopted: Phillips, L.E. & De Clerck, O. (2005). The terete and sub-terete members of the red algal tribe Amansieae (Ceramiales, Rhodomelaceae). Cryptogamie Algologie 26: 5-33, 26 figs.

Comments: Known only from southern Moçambique and northern Natal. Digeneopsis differs from Digenea mainly in having 2 tetrasporangia per segment rather than 1 as in Digenea. The number of pericentral cells may be used to separate the genera also, Digeneopsis having 5 whereas from 6-12 are present in Digenea Saenger 1973).

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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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

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Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 09 July 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 26 April 2024