Abstract
A resume on the morphological features of tracheoids has been presented under various typological heads with examples drawn from the published literature to enhance their utility in detailed descriptions of tracheoids. Depending on the constancy of cell form the tracheoids are classified under two groupings: homomorphic and heteromorphic. Homomorphic group includes brachytracheoids, sclerotracheoids, macrotracheoids, tubuliform spirotracheoids, vermiform tracheoids and loratotracheoids. Heteromorphic grouping includes heterotracheoids. Each type represents a descriptive unit recognised on the cell form and is supported by a qualifying description for their delimitation.
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Rao, T.A., Das, S. Typology of foliar tracheoids in angiosperms. Proc. Indian Acad. Sci. 88, 331–345 (1979). https://doi.org/10.1007/BF03046106
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DOI: https://doi.org/10.1007/BF03046106