Abstract

AVILA-ORTIZ, Alejandrina G.; MATEO-CID, Luz Elena  and  MENDOZA-GONZALEZ, A. Catalina. Morphological characterization of Padina boergesenii (Dictyotaceae, Phaeophyceae) on the mexican Coast of the Gulf of Mexico and Caribbean sea. Polibotánica [online]. 2011, n.31, pp.1-20. ISSN 1405-2768.

A morphological characterization of Padina boergesenii Allender & Kraft was carried out based on variation in sporophytes and gametophytes of male and female plants from Mexican populations from the Gulf of Mexico and Caribbean Sea. We analyzed 78 herbarium specimens from ENCB (47 vouchers), FEZA (30) and UAMIZ (1). The specimens were taken during 1960 to 2007 at 14 coastal and 20 insular localities from Veracruz, Campeche, Yucatan and Quintana Roo. Of the specimens examined 95% were sporophytic thalli; only 5% were gametophytic, two female and one male. The one thallus seen with both types of gametangia came from Isla Chica, Yucatan, suggesting that P. boergesenii can have monoecious or dioecious thalli. In coastal localities the thalli become shallowly split into fan-shaped segments, whereas in insular localities they are semicircular with entire margins and only rarely split into segments. Finally, this taxon, which inhabits the intertidal zone, is distributed in Mexico from Veracruz to Quintana Roo.

Keywords : Dictyotales; gametophyte; morphology; sporophyte.

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