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Sometimes the limited anatomical information available for some groups of plants can be surprising. This is the case of the Orchidaceae, a quite numerous group of angiosperms with about 25000 species (Pridgeon et al. 2009) that is common in tropical and subtropical regions (e.g., Pabst and Dungs 1977). Considering these species, there is a particular lack of knowledge regarding the roots of the Catasetinae subtribe, which occurs in different altitudes of tropical regions. Cristiano Pedroso de Moraes (UNIARARAS, Araras, São Paulo) and colleagues have studied the twelve most representative taxa of that group. They were able to determine interesting anatomical variations, such as the occurrence of flavonoidic crystals that are quite characteristic of two particular genera. Furthermore, the velamen also shows some variation and, together with other features, might be employed in taxonomy studies (Moraes et al. 2012).

The anatomy of some orchid roots, the characterization of tomato mutants and the perception of evolution among graduate students