Adenocystis Hooker f. &, 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.
Taxonomic status: currently recognized as a distinct genus.
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.
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 10 Oct 2021 by E.A. Molinari Novoa.
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.
Numbers of names and species: There are 6 species names in the database at present, as well as 5 infraspecific names. Of the species names, 3 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..
Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):
Click here to also show infraspecific names in the list below.
Silberfeld, T., Racault, M.-F.L.P., Fletcher, R.L., Couloux, A., Rousseau, F. & De Reviers, B. (2011). Systematics and evolutionary history of pyrenoid-bearing taxa in brown algae (Phaeophyceae). European Journal of Phycology 46(4): 361-377.
Rousseau, F., Reviers, B. de, Leclerc, M.-C., Asensi, A. & Delépine, R. (2000). Adenocystaceae fam. nov. (Phaeophyceae) based on morphological and molecular evidence. European Journal of Phycology 35: 35-43, 7 figs, 2 tables.
Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.
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.
Created: 28 December 2000 by M.D. Guiry
Verified by: 10 October 2021 by E.A. Molinari Novoa
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=42580
Please cite this record as:
E.A. Molinari Novoa in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 27 October 2021.