Costaria Greville, 1830

Holotype species: Costaria turneri Greville

Currently accepted name for the type species: Costaria costata (C.Agardh) De A.Saunders

Original publication and holotype designation: Greville, R.K. (1830). Algae britannicae, or descriptions of the marine and other inarticulated plants of the British islands, belonging to the order Algae; with plates illustrative of the genera. pp. [i]-lxxxviii, [1]-218, pl. 1-19. Edinburgh & London: McLachlan & Stewart; Baldwin & Cradock.

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Description: Life history diplohaplontic with alteration of large sporophyte bearing unilocular meiosporangia with paraphyses (sori) and microscopic dioecious and oogamous, heteromorphous gametophytes (for detail, see Laminaria). Haploid chromosome number in C. costata is n = c. 30 (Nishibayashi and Inoh 1956, Ohmori 1967). Sporophyte annual, somtimes perennial (Gayle Hansen, pers. comm.), composed of wide-spreading branched haptera as holdfast, cylindrical stipe (3-50 cm) often flattening above and with numerous grooves parallel to the long axis and blade with 5 longitudinal percurrent ribs alternating on the two surfaces. Portion of blade between the ribs bullate and with scattered small perforations. Meristematic region situated at transition zone between stipe and blade. Sori develop from midsummer to late autumn on both surfaces in the hollows surrounding the perforations or in the depression of the ribs. Culture experiments revealed that sorus formation takes place at 10-12°C and 18-20°C in longdays and shortdays (Sanbonsuga & Hasegawa 1969). Mucilage ducts absent. Structure of sporophyte as in Laminaria composed of photosynthetic meristoderm, parenchymatic cortex and central medulla.

Information contributed by: I. Bartsch and M.D. Guiry. The most recent alteration to this page was made on 2017-09-05 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

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: Growing in the low intertidal to subtidal together with Laminaria spp. Survival range of C. costata sporophytes is -1.5 to 20°C (Léng and Freshwater 1988) and of gametophytes -1.5 to 26/27°C (tom Dieck 1993). Genus distributed from the western north Pacific (Korea, Saghalien, Japan, Kurile islands) to eastern Aleutian islands, Alaska to southern California. Phenotypic variation is common in this genus as in all other Laminariales.

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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.

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 05 September 2017. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 18 April 2024

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