Dictyopteris J.V.Lamouroux, 1809, nom. cons.
Holotype species: Dictyopteris polypodioides (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.
Request PDFPrecise date of publication: May 1809
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 2015-10-19 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
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, 1 fig., 1 table.
Comments: Widely distributed in tropical to temperate seas.
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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera,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.
Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=50
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 19 October 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 21 November 2024
