Holotype species: Dilsea edulis Stackhouse
Currently accepted name for the type species: Dilsea carnosa (Schmidel) Kuntze
Original publication and holotype designation: Stackhouse, J. (1809). Tentamen marino-cryptogamicum, ordinem novum; in genera et species distributum, in Classe XXIVta Linnaei sistens. Mémoires de la Société Imperiale des Naturalistes de Moscou 2: -97.
Taxonomic status: currently recognized as a distinct genus.
Most recent taxonomic treatment adopted: Saunders, G.W. (2008). A DNA barcode examination of the red algal family Dumontiaceae in Canadian waters reveals substantial cryptic diversity. 1. The foliolse Dilsea-Neodilsea complex and Weeksia. Botany 86: 773-789.
Monotypic when first introduced. - (23 Jan 2017) - M.D. Guiry
Description: Foliose, coriaceous, spathulate to cuneate to ovate, cleft or uncleft, with distinct stipe and discoid holdfast. Annual or perennial. Medulla of multinucleate, secondarily pit-connected, stellate cells with long arms, mixed with rhizoidal filaments. Inner cortical cells oblong to stellate. Outer cortical cells uninucleate, ovoid, progressively smaller toward cuticle. Dioecious. Carpogonium terminating a distally recurved, proximally branched, adventitious filament. Connecting filaments from fertilized carpogonial filament contacting a succession of intercalary, distal, auxiliary cells on separate, proximally branched, adventitious filaments. Cells of proximal branches sometimes forming secondary pit connections with vegetative cells. Gonimoblast arising from remnant of connecting filament attached to auxiliary cell. Carpospores shed by erosion of thallus. Spermatangia, where known, superficial. Tetrasporophyte isomorphic. Tetrasporangia cruciate, intercalary in cortex (lateral in Dilsea integra). Fertile in fall and winter.
Information contributed by: S.C. Lindstrom. The most recent alteration to this page was made on 23 Jan 2017 by M.D. Guiry.
Comments: Intertidal or subtidal. Restricted to the cool temperate to arctic waters of the northern hemisphere: northeast Pacific Ocean, eastern Bering Sea, Arctic Ocean, North Atlantic Ocean.
Numbers of names and species: There are 9 species names in the database at present, of which 6 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.
Saunders, G.W. & Lindstrom, S.C. (2011). A multigene phylogenetic assessment of the Dilsea/Neodilsea species complex (Dumontiaceae, Gigartinales) supports transfer of Neodilsea natashae to the genus Dilsea. Botanica Marina 54(5): 481-486.
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: 23 January 2017 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=111
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 21 March 2019.