Adenocystis Hooker f. & Harvey, 1845

Holotype species: Adenocystis lessonii (Bory) Hooker f. & Harvey

Currently accepted name for the type species: Adenocystis utricularis (Bory) Skottsberg

Original publication and holotype designation: Harvey, W.H. & Hooker, J.D. (1845). XXXVI. Algae L. In: The botany of the Antarctic voyage of H.M. discovery ships Erebus and Terror, in the years 1839-1843, under the command of Captain Sir James Clark Ross, Kt., R.N., F.R.S., etc. by Joseph Dalton Hooker, M.D., R.N., F.L.S., assistant surgeon of the "Erebus" and botanist to the expedition. Vol. 1. Flora antarctica. Part I. Botany of Lord Auckland's Group and Campbell's Island. (Hooker, J.D. Eds), pp. 175-193. London: L. Reeve.

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Description: Thallus of simple clavate vesicles to 10 cm long and 3 cm diam. small discoid holdfast. Growth from cells at the base of hairs in an apical pit. Thallus structure is haplostichous and differentiated into a compact outer layer of small cells containing numerous physodes, a cortex of isodiametric cells and a medulla of loose filaments surrounding large deposits of mucilage. Discoid chloroplasts have lateral pyrenoids. Phaeophycean hairs develop in cryptostomata scattered over the thallus. Life history haplodiplontic. Macrothalli are sporophytes, producing ovoid unilocular meiosporangia amongst the surface layer of cells. Meiospores heterokont and develop into very small dioecious discoid or filamentous gametophytes. Sexual reproduction is isogamous. Gametes are produced in plurilocular gametangia or singly in thallus cells. Gametes are heterokont, 6 ( 4.5 fm, possesses an eyespot and are negatively phototactic. Zygotes develop into diploid sporophytes. In culture, unfertilized gametes develop parthenogenetically and haploid macrothalli may develop directly on gametophytes.

Information contributed by: M.N. Clayton. The most recent alteration to this page was made on 2021-10-10 by E.A. Molinari Novoa.

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.

Comments: Adenocystis grows intertidally in southern regions of Australia (Tasmania), New Zealand and South America, subantarctic islands, and Antarctica. The taxonomic relationships of Adenocystis are unclear. Most recently Womersley (1987) placed Adenocystis in the Scytothamnaceae within the Chordariales. However, there are substantial differences between Adenocystis and Scytothamnus, notably in chloroplast and meristem structure and in my view they justify separating the genera at family and possibly ordinal level.

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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=42580

Citing AlgaeBase
Cite this record as:
E.A. Molinari Novoa in Guiry, M.D. & Guiry, G.M. 10 October 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 28 March 2024

 
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