Holotype species: Splachnidium rugosum (Linnaeus) Greville
Original publication and holotype designation: Greville, R.K. (1830). Algae britannicae, or descriptions of the marine and other inarticulated plants of the British islands, belonging to the order Algae; with plates illustrative of the genera. pp. [i*-iii*], [i]-lxxxviii, -218, pl. 1-19. Edinburgh & London: McLachlan & Stewart; Baldwin & Cradock.
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 terete, irregularly branched to 20 cm long and 8 mm diameter. Growth from an apical meristem consisting of a pear-shaped apical cell and surrounding tissue, densely covered with short hairs. Thallus structure is parenchymatous and differentiated into a compact outer layer of small cells grading into a larger-celled cortex and a medulla of loose filaments surrounding copious deposits of mucilage. Stellate chloroplasts possess an axial pyrenoid penetrated by cytoplasmic channels. Conceptacles develop from pear-shaped initial cells which differentiate within the apical meristem. Phaeophycean hairs develop in conceptacles. Life history is haplodiplontic. Macrothalli are sporophytes producing ovoid unilocular meiosporangia, 169-200 ( 65-90 fm, in conceptacles scattered over the thallus. Meiospores are heterokont, positively phototactic, 13-14 fm long, and develop into dioecious filamentous gametophytes. Sexual reproduction is anisogamous. Plurilocular gametangia are conical, 130-150 ( 45-60 fm. Male gametangia are orange and have smaller loculi than the female gametangia which are dark brown in color. Gametes are heterokont and possess an eyespot. Male gametes are 4-6 fm long; females are 7-10 fm and have a larger chloroplast. In culture, unfertilized female gametes develop parthenogenetically, and haploid macrothalli occasionally develop directly on gametophytes. Splachnidium grows intertidally in cold temperate regions of Australia, New Zealand, South Africa, Juan Fernandez Island and on some subantarctic islands. There is doubt over the most appropriate ordinal classification of Splachnidium. Though classified in the Chordariales by Womersley (1987), I consider that the highly unusual chloroplast structure, and the unique apical meristem clearly distinguish Splachnidium apart from other species in this order. The affinities of Scytothamnus possibly lie with other taxa sharing a similar chloroplast structure, Splachnidium and Stereocladon.
Information contributed by: M. N. Clayton. The most recent alteration to this page was made on 21 Jun 2014 by M.D. Guiry.
Numbers of names and species: There are 1 species names in the database at present, of which 1 has 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.
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: 21 June 2014 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=40695
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 May 2019.