MSA - Systematics/Evolution
Patino-Conde, V. , Magallón, Susana .
Origin and evolution of hydnoid hymenophore among holobasidiate agaromycetes.
The hymenophore is defined as plecto that supports the hymenium. This structure has great importance in the taxonomy of holobasidiate agaricomycetes (formerly Homobasidiomycetes). Traditional classifications at the order or family level for this group were strongly influenced by the macroscopical configurations of hymenophore. However, this importance decayed as studies about micromorphology and taxonomy of agaricomycetes advanced. Recent phylogenetic evidence suggests that the evolution of the hymenophore among agaricomycetes represents multiple morphological convergences. Without exception all different types of hymenophora (i.e. porus, lamellas, teeth, etc.) have apparently originated several times among major clades of agaricomycetes. Hydnoid (toothed) hymenophore is probably one of the most recurrent macroscopical configurations within this group; nevertheless, it is rare at the species level. In this study, we conducted detailed observations of micromorphological attributes of hydnoid hymenophora in different genera of agaricomycetes. Through the use of phylogenetic comparative methods, we investigated the distinct origins of hydnoid hymenophora, and their transformation into other types of hymenophora. The results support the independent evolution of this macroscopic configuration in several instances along the evolutionary history of agaricomycetes. In addition, our morphological study shows that the hymenophore of most hydnoid fungi is plectologically similar, and in all cases it display some distinctive morphological attributes, such as the presence of sterile hyphae in the apex, the subapical distribution of the hymenium, a regular to subregular hymenophoral trama, and tramal origin for hymenophore. This suggests that, in addition to convergence in macroscopic shape, hydnoid fungi apparenty share an underlying morphogenetic development.
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1 - Instituto de Biologia, Departamento de Botanica, Circuito Exterior s/n, Ciudad Universitaria, Coyoacan, D.F., 04510, Mexico
Presentation Type: Poster:Posters for Topics
Location: Event Tent/Cliff Lodge
Date: Tuesday, July 28th, 2009
Time: 5:30 PM