Ornamentation of achene silica walls and its contribution to the systematics of Eleocharis (Cyperaceae) |
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Authors: | Carlos Roberto Maximiano da Silva Leandro Bento da Silva Célia Guadalupe Tardelli de Jesus Andrade Rafael Trevisan María Socorro González-Elizondo André Luís Laforga Vanzela |
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Affiliation: | 1.Laboratório de Biodiversidade e Restaura??o de Ecossistemas, Departamento de Biologia Geral, CCB,Universidade Estadual de Londrina,Londrina,Brazil;2.Laboratório de Microscopia Eletr?nica e Microanálises, CCB,Universidade Estadual de Londrina,Londrina,Brazil;3.Departamento de Botanica,Universidade Federal de Santa Catarina,Florianópolis,Brazil;4.CIIDIR, IPN, Unidad Durango,Durango, Dgo,Mexico |
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Abstract: | Micromorphology of the achene surface of 26 Brazilian species of Eleocharis was studied by scanning electron microscopy in order to evaluate its usefulness in the taxonomy of the genus. The results point out two patterns of cell organization according to silica structures of achenes. The first corresponds to a group of species (group A) that have small to medium cells arranged vertically. The second is found in those species (group B) with medium to large cells arranged horizontally. These data were useful in separating species of Eleocharis subgenus Scirpidium and E. subgenus Limnochloa (group B) from E. subgenus Eleocharis (group A). However, group A shows considerable variation in silica wall arrangement. Eleocharis squamigera, previously considered as part of E. subgenus Eleocharis, shows features rather similar to those of Scirpidium, confirming recent phylogenies. The subgenus Limnochloa was clearly distinguished from others by achenes with large cells (over 55 μm width), presence of crenate or repand anticlinal walls, and some orifices near the wall in some species. The silica wall ornamentation seems to be a useful morphological tool for studying relationships between subgenera and distinguishes Limnochloa from the other subgenera. |
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