Nemacystus Derbès & Solier, 1850

Holotype species: Nemacystus ramulosus Derbès & Solier

Currently accepted name for the type species: Nemacystus erythraeus (J.Agardh) Sauvageau

Original publication and holotype designation: Derbès, [A.A.] & Solier, [A.J.J.] (1850). Sur les organes reproducteurs des algues. Annales des Sciences Naturelles, Botanique, Troisième série 14: 261-282, pls 32-37.

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Description: Thallus erect, cylindrical, branched, to 30 cm high, attached to substratum with a small discoid holdfast. Medulla a single leading filament with dome-shaped apical cell. Cortex to 5 cells thick, with cell size decreasing towards periphery. Assimilatory filaments simple, to 20 cells long, straight or curved. Phaeophycean hairs present. Unilocular sporangia ovoid to pyriform, borne at base of assimilatory filaments. Plurilocular sporangia uniseriate, on sometimes branched pedicels at base of assimilatory filaments. Life history either direct via spores from plurilocular sporangia or diplohaplontic via spores from unilocular sporangia, with macroscopic sporophytes and microscopic "streblonematoid" gametophytes producing isogametes in few-celled uniseriate gametangia. Distributed in tropical and warm-temperate waters around the world.

Information contributed by: A. F. Peters. The most recent alteration to this page was made on 2016-10-03 by Salvador Valenzuela Miranda.

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

Most recent taxonomic treatment adopted: Silberfeld, T., Rousseau, F. & Reviers, B. de (2014). An updated classification of brown algae (Ochrophyta, Phaeophyceae). Cryptogamie Algologie 35(2): 117-156, 1 fig., 1 table.

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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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=33403

Citing AlgaeBase
Cite this record as:
Salvador Valenzuela Miranda in Guiry, M.D. & Guiry, G.M. 03 October 2016. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 22 November 2024