Dictyopteris J.V., 1809, nom. cons.
Holotype species: Dictyopteris polypodioides (A.P.De Candolle) J.V.Lamouroux
Original publication and holotype designation: Lamouroux, J.V.F. (1809). Observations sur la physiologie des algues marines, et description de cinq nouveaux genres de cette famille. Nouveau Bulletin des Sciences, par la Société Philomathique de Paris 1: 330-333, fig. 2, pl. 6.
Precise date of publicationMay 1809
Taxonomic status: currently recognized as a distinct genus.
Gender: This genus name is currently treated as feminine.
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: Thalli erect or prostrate, attached by a matted rhizoidal holdfast, up to 60 cm long, complanate or twisted, subdichotomously to laterally branched, branches 0.5-25 mm broad, with a conspicuous midrib, with or without fine veins in the lateral wings. Growth initiated by a marginal row of 3-15 apical cells. Thallus wings 1-8 cells thick with the midrib 8-30 cells thick. Thallus in multilayered species differentiated into a monostromatic cortex containing many chloroplasts and a medulla of slightly larger cells. Hair tufts scattered or in lines. Sporangia solitary or in sori, embedded in or projecting above both thallus surfaces, subspherical to ovoid, 80-120 mm in diameter when mature, without or with 1-2 stalk cells, forming 4 spores. Gametophytes dioecious. Oogonia solitary or in small groups on both thallus surfaces, embedded in or projecting above the thallus. Antheridial sori large, 400-1500 mm long and 200-1000 mm across, whitish, bordered by 1-3 layers of only slightly elongate sterile cells. Antheridia with many tiers of locules. Dictyopteris is easily recognized by the distinctive midrib. Considerable morphological and anatomical variation occurs between the small, distromatic species (e.g. D. delicatula, D. repens) and the larger robust, multilayered species (e.g. D. muelleri, D. acrostichoides).
Information contributed by: J. A. Phillips and R. J. King. The most recent alteration to this page was made on 19 Oct 2015 by M.D. Guiry.
Comments: Widely distributed in tropical to temperate seas.
Numbers of names and species: There are 47 species names in the database at present, as well as 3 infraspecific names. Of the species names, 35 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.
Ribero Siguan, M.A., Gomez Garreta, A., Salvador Soler, N. Rull Lluch, J. & Kapraun, D.F. (2011). Nuclear content estimates suggest a synapomorphy between Dictyota and six genera of the Dictyotales (Phaeophyceae). Cryptogamie Algologie 32(2): 205-219.
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: 29 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=50
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2020. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 29 October 2020.