Pseudoceramium oliveirarum Barros-Barreto, Maggs & M.A.Jaramillo

Barros-Barreto, Maria Beatriz, Jaramillo, Maria Alejandra, Hommersand, Max H., Ferreira, Paulo C. G. & Maggs, Christine A., 2023, Phylogenetic analysis of the red algal tribe Ceramieae reveals multiple morphological homoplasies but defines new genera, Cryptogamie, Algologie 44 (2), pp. 13-58 : 26

publication ID	https://doi.org/ 10.5252/cryptogamie-algologie2023v44a2
DOI	https://doi.org/10.5281/zenodo.7941800
persistent identifier	https://treatment.plazi.org/id/7974A03A-B423-8C3B-6BB9-FE8AADFCFABB
treatment provided by	Felipe
scientific name	Pseudoceramium oliveirarum Barros-Barreto, Maggs & M.A.Jaramillo
status	sp. nov.

Treatment

Pseudoceramium oliveirarum Barros-Barreto, Maggs & M.A.Jaramillo , gen. nov., sp. nov.

Plants mainly erect, 10-200 mm high, pseudodichotomously branched. Axes partially corticated, with apices strongly forcipate.Nodes formed by 8-9 periaxial cells each cutting off laterally 1-2 pseudoperiaxial cells. Periaxial cells also cut off two acropetal cells. Tetrasporangia formed by periaxial cells, unilateral/bilateral to verticillate, 1-3 per node, partially covered by cortical cells.

TYPE LOCALITY. — Brazil. Espírito Santo, Costão, Itapemirim.

HOLOTYPE. — Brazil. Espírito Santo, Costão, Itapemirim , 04.III.2004, M. B. Barreto no. 47 (holo-, RB [ RB 420029 ]).

GENBANK. — DQ458932 (rbc L), MW354756 (LSU), MW354770 (COI-5P).

ETYMOLOGY. — The epithet oliveirarum was chosen to honour Eurico Cabral de Oliveira Filho and Mariana Cabral de Oliveira, father and daughter who are exemplary Brazilian phycologists.

NOTES

This new species circumscribes a previously known taxon, widely distributed on the Brazilian coasts, usually identified as Ceramium brevizonatum var. caraibicum . Detailed morphology and distribution are shown in Barros-Barreto & Yoneshigue-Valentin (2001) and Barros-Barreto et al. (2006). Its main morphological character is the node formed of 1-2 acropetal cells layers, 3-16 µm high, and periaxial cells cutting off 1-2 pseudoperiaxial cells 14-32 µm high. Axial cells are 60-140 µm in diameter and 42-142 µm high; 1-2 protruding unilateral tetrahedral tetrasporangia are partially covered by cortical cells 40-80 µm in diameter. This species is erected because it differs from Ceramium brevizonatum H.E.Petersen in having pseudoperiaxial cells and has a 3-4% genetic divergence for rbc L.