Phylogenetic analysis of the red algal tribe Ceramieae reveals multiple morphological homoplasies but defines new genera Author Barros-Barreto, Maria Beatriz Department of Botany, Federal University of Rio de Janeiro, Rua Professor Rodolpho P. Rocco 211, CCS-Bloco A, sala 66, 21941 - 902, Rio de Janeiro, RJ (Brazil) beatrizdebb@gmail.com Author Jaramillo, Maria Alejandra Grupo DIVERSITAS, Facultad de Ciencias Básicas y Aplicadas, Universidad Militar Nueva Granada, kilómetro 2, Cajica-Zipaquira, Cajica, Cundinamarca (Colombia) Author Hommersand, Max H. Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599 - 3280 (United States) Author Ferreira, Paulo C. G. Department of Medical Biochemistry, Institute of Medical Biosciences, Federal University of Rio de Janeiro, RJ (Brazil) Author Maggs, Christine A. School of Biological Sciences, Queen’s University, Belfast BT 9 5 AJ (Northern Ireland) text Cryptogamie, Algologie 2023 2023-05-04 20 2 13 58 http://dx.doi.org/10.5252/cryptogamie-algologie2023v44a2 journal article 10.5252/cryptogamie-algologie2023v44a2 1776-0984 7938655 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.