Padina Adanson, 1763, nom. cons.
Holotype species: Padina pavonica (Linnaeus) Thivy
Original publication and holotype designation: Adanson, M. (1763). Familles des plantes. II. Partie [Vol. 2]. pp. [1-24], [i-iii], -640. Paris: Chez Vincent, Imprimeur-Librarie de Mgr le Comte de Provence, rue S. Servin.
Description: Thalli erect or prostrate, attached by a rhizoidal holdfast, up to 20 cm long, complanate, flabellate or becoming lacerate often to the base, segments 1-5cm broad, calcified on one or both surfaces. Growth initiated by an entire marginal row of apical cells in an involute apical fold, directed towards the upper (=inner) thallus surface. Thallus 2-8 cells thick. Whitish hairs in concentric lines on one of both thallus surfaces. Outermost layer of cortical cells with many discoid chloroplasts. Sporangial sori forming concentric rows or isolated patches between the hair lines on one or both thallus surfaces, indusium present or absent. Sporangia ovoid to pyriform, 80-170 mm high when mature, producing 4 spores. Gametophytes usually dioecious, or monoecious in some species. Oogonial sori in concentric rows. Oogonia arranged in rows in sorus. Antheridial sori whitish, in concentric rows or in isolated patches, partially embedded in the thallus, with many tiers of locules. Padina species are delimited by the number of cell layers, the arrangement of sporangial sori in relation to concentric hair bands, presence/absence of hair bands on the lower thallus surface and the presence/absence of an indusium over sporangial sori. Critical re-evaluation may reduce the number of species recognized. Widely distributed in tropical to temperate seas.
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.
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Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in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=52
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 25 September 2022