Lectotype species: Hedophyllum subsessile (Areschoug) Setchell
Currently accepted name for the type species: Hedophyllum sessile (C.Agardh) Setchell
Original publication:Setchell, W.A. (1901). Notes on algae, I. Zoe 5: 121-129.
Type designated in Saunders, De A. (1901). Papers from the Harriman Alaska Expedition XXV. The algae. Proceedings of the Washington Academy of Sciences 3: 391-486, 19 pls.
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: Life history diplohaplontic with alternation of large sporophyte bearing unilocular meiosporangia with paraphyses (sori) and microscopic dioecious and oogamous, heteromorphous gametophytes (for detail, see Laminaria). Sporophyte composed of holdfast, stipe and blade. Meristematic region situated at transition region between stipe and blade. Holdfast with branched hapteres; stipe initially yery short but distinct, later disappearing. Blades in the beginning ovate and entire, later splitting deeply and/or becoming very cucullate, at age ample, plicated and sessile. Lower margin of blade give rise to hapteres. Morphology of individuals vary considerably according to habitat exposure. There is experimental evidence that blade morphology may have a considerable influence on the effective drag force at the same water speed (Armstrong 1984). Age of sporophyte unknown, probably few individuals older than 2 years. H. subsessile is the second-year stage of H. sessile and thus a synonym of the latter species. Development of sporophytes with pronounced seasonality: most young sporophyte appear in July. Those plants not torn away by winter storms become fertile in November. Sori basal and irregular in outline. During winter the blades become reduced to a short strip near the holdfast, but regenerate in spring at both sides of that short strip. The regenerated blades develop new haptera from their new margins (Widdowson 1965). Structure of sporophyte as in Laminaria composed of photosynthetic meristoderm, parenchymatic cortex and central medulla. .
Information contributed by: I. Bartsch. The most recent alteration to this page was made on 21 Jun 2014 by M.D. Guiry.
Comments: Genus endemic to the northeastern Pacific; distributed from Aleutian islands, Alaska to central California. In part it is a dominant member of the low intertidal zone. Survival range of sporophytes is -1.5-15_(Léng and Freshwater 1988).
Numbers of names and species: There are 5 species names in the database at present.
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: 21 June 2014 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=36214
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 16 November 2018.