Halymenia pseudofloresii Collins & M.Howe

Resendiz, María Luisa Núñez, Dreckmann, Kurt M., Sentíes, Abel, Wynne, Michael J. & Tejera, Hilda León, 2019, Marine red algae (Rhodophyta) of economic use in the algal drifts from the Yucatan Peninsula, Mexico, Phytotaxa 387 (3), pp. 219-240 : 234

publication ID

https://doi.org/ 10.11646/phytotaxa.387.3.3

DOI

https://doi.org/10.5281/zenodo.13724613

persistent identifier

https://treatment.plazi.org/id/03D1182D-FFB3-B119-FF26-FF3E63209F0B

treatment provided by

Felipe

scientific name

Halymenia pseudofloresii Collins & M.Howe
status

 

Halymenia pseudofloresii Collins & M.Howe

Thallus membranous, mucilaginous, laminar, extended, purple-red, 25–36 cm in length, flattened in cross section, 285–310 μm in diameter. Main axes branching irregularly; branches with the appearance of ribbon strips, with margins completely covered by proliferations of sizes and variable diameters, arranged alternately opposite ( Fig. 59 View FIGURES 51–64. 51–53 ). Multiaxial organization with a filamentous medulla and a pseudoparenchymatous cortex ( Fig. 60 View FIGURES 51–64. 51–53 ). Medulla composed of several filaments loosely arranged in mucilaginous gel, 6–12 μm in diameter. Cortex composed of two layers of rounded cells, 10–18 μm in diameter. Tetrasporangia spherical, 15–20 μm in diameter, cruciately divided, scattered among the cortical cells ( Fig. 61 View FIGURES 51–64. 51–53 ).

Taxonomic comment: According to Schneider et al. (2010), from molecular data, Halymenia pseudofloresii is the only species distributed in the American Atlantic coasts. Its sister species, H. floresii , which has been previously recorded for Yucatan Peninsula ( Godínez-Ortega et al. 2008), appears to be restricted to Europe ( Schneider et al. 2010, Wynne 2017).

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