Hormosira () , 1838, nom. cons.
Holotype species: Hormosira moniliformis Meneghini
Currently accepted name for the type species: Hormosira banksii (Turner) Decaisne
Original publication and holotype designation: Meneghini, G. (1838). Cenni sulla organographia e fisiologia delle alghe. Nuovi Saggi della [Cesarea] Regia Accademia di Scienze, Lettere ed Arti di Padova 4: 325-388.
Taxonomic status: currently recognized as a distinct genus.
Description: Thallus to 20 (-30) cm long, consisting of branched chains of subspherical to elongate, bead-like segements. Small discoid holdfast. Growth from an apical meristem consisting of 4 apical cells and surrounding meristematic tissue. Thallus is parenchymatous and differentiated into a meristoderm of relatively small cells with numerous chloroplasts and physodes, a cortex of larger, vacuolate cells and a filamentous medulla surrounding a fluid or air-filled central space. Discoid chloroplasts lack pyrenoids. Life history is diplontic. Sexual reproduction is oogamous. Individuals are dioecious with conceptacles containing paraphyses (phaeophycean hairs) and antheridia or oogonia scattered over the thallus. Antheridia produce 64 spermatozoids, 7-15 µm in length. Spermatozoids are heterokont, possess an eyespot and are negatively phototactic. The anterior flagellum is 6.5 µm long and bears a blunt spine 2 µm back from the tip. The posterior flagellum is relatively long, 13 µm. Oogonia produce 4 eggs, 60-65 µm diameter and 4 sterile vestigial cells. Eggs secrete the sperm attractant, hormosirene.
Information contributed by: M.N. Clayton. The most recent alteration to this page was made on 19 Oct 2015 by M.D. Guiry.
Comments: Hormosira is endemic to the temperate regions of Australia and New Zealand.
Numbers of names and species: There are 9 species names in the database at present, as well as 1 infraspecific names. Of the species names, 2 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.
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: 19 October 2015 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=42605
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 24 July 2019.