02360nab a2200313 i 4500 BR-BrBNA 20250313101133.0 250313b2015 bl.qr|pooa||| 00| 0 eng | BR-BrBNA eng F50 F70 Silva, Anádria Stéphanie da Ribeiro, André Rodolfo de Oliveira Sousa, Mayco Werllen dos Santos Fagg, Christopher William Falcão, Rosana Oliveira, Regina Célia de Micromorphology of the upper anthecium in Mesosetum Steud. and related genera (Poaceae, Arthropogoninae) and its taxonomic applications Publicação on-line; 33 ref.; 3 tables; 4 illus.; Summary (En) Abstract Mesosetum is a Neotropical genus with 25 species, and 21 of them occur in Brazil. Mesosetum forms a clade closely related with Keratochlaenarigidifolia and Tatianyx arnacites. The objective of this work was to establish the taxonomic value of the upper anthecium micromorphology for the group. A total of 96 specimens, representing all Mesosetum species(except M. wrightii), K. rigidifolia and T. arnacites were examined under a scanning electron microscope (SEM). PCA and UPGMA analysis were applied using the micromorphological characters. Fifithteen useful taxonomic characters were identified. We highlight the following characters to distinguish the Mesosetum species: the presence, type and distribution of papillae on the abaxial surface of the upper lemma; the presence of unicellular macrohairs and bicellular microhairs; presence or absence of silica cells and the structure of the germination lid. The present work shows that the micromorphological characters identified are important taxonomically at the specific level, allowing the species identification in many cases. Key words: Grass, Keratochlaena, Tatianyx, PCA, UPGMA. MORFOLOGIA VEGETAL GRAMÍNEA TAXONOMIA POACEA 709 348914 Rio de Janeiro-RJ Jardim Botanico do Rio de Janeiro 1935 2025-1431 Rodriguésia (Brazil) 0370-6583; 2175-7860 on-line v. 66(2) p. 645-657; (2015) BR2025000188 https://www.scielo.br/j/rod/a/ZR3FsLYV4vnnK4NpDZNnQGm/?format=pdf&lang=en ANA 330376 330376