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Dictyota mertensii(Martius) Kützing

PhylumClassOrderFamilyGenusSpecies
ochrophytaPhaeophyceaeDictyotalesDictyotaceaeDictyotamertensii
Habitat
On dead corals on wave-exposed reef crests
Distribution
Western Atlantic, Eastern Atlantic, Indo-Pacific Ocean
Characteristics
Thallus erect, fluffy, bushy, to 8 cm high, brown out of the water, iridescent-blue/green in situ.
Branching alternate, blades twisted up to 3.5 mm wide, 80-120 μm thick, >47 cells wide with apices broadly rounded. Medullary cells rectangular, hyaline, arranged in single distinct layer up to 100 μm thick. Surface cortical cells rectangular, 15-20 μm diam., arranged in a single row on both sides of medulla.
Other Literature
Guiry M.D. & Guiry G.M. 2009. AlgaeBase. Worldwide Electronic Publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 21 August 2009

Littler S.C. & Littler M.M. 2000. Caribbean Reef Plants. OffShore Graphics INC. Washington: 542pp

In Bocas Del Toro
Reported ByWysor, B. and O.De Clerck. 2003. An Updated and Annotated List of Marine Brown Algae(Phaeophyceae) of the Caribbean Coast of the Republic of Panama. Botanica Marina 46: 151–160.

NSF-PASI Advanced Methods in Tropical Phycology Course 2009

LocalityFlat Rock Beach, Isla Colon
CommentsMost characteristics described above are consistent with the description of the species by Littler & Littler (2000); however, there are some differences in the blade width as some blades are more than 3 mm wide and others are less than 50 cells wide. Sporangia, oogonia and surface hairs were not observed.

Dictyota mertensii in the field resembles D. hamifera and D. humifusa; however, those species show dichotomous to irregular branching and never show alternate branching. Moreover, D. hamifera bear lateral tendrils or hooks while Dictyota humifusa’s thallus is generally postrate and rarely erect.
Compiled by
Dagoberto E. Venera-Ponton
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Links
Reference
Wysor, B. and O.De Clerck. 2003. An Updated and Annotated List of Marine Brown Algae(Phaeophyceae) of the Caribbean Coast of the Republic of Panama. Botanica Marina 46: 151–160.

Field Guide to Common Marine Algae of the Bocas del Toro Area II: NSF-PASI Advanced Methods in Tropical Phycology Course 2009
Comments
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