Comparative wood anatomy of African Coffeeae (Rubiaceae-Ixoroideae)
1997
Jansen, S. | Smets, E. (Katholieke Univ. Leuven, Heverlee (Belgium). Botanical Inst. Lab. of Plant Systematics) | Robbrecht, E. | Beeckman, H.
Wood samples of Coffea, Psilanthus (Coffeeae), Argocoffeopsis and Calycosiphonia (Gardenieae-Diplosporinae) are studied with LM and SEM. Wood of the four genera is characterized by exclusively solitary vessels, fibre-tracheids and axial parenchyma ranging from diffuse to diffuse-in-aggregates. In Coffea and Psilanthus many prismatic crystals are conspicuously present in the ray cells; only this character confirms the earlier segregation of Argocoffeopsis and Calycosiphonia from the genus Coffea. The wood anatomical differences found between Coffea and Psilanthus are mainly quantitative and there are little or no characters with diagnostic significance. Due to inter- and intraspecific uniformity, wood anatomy is not informative at the specific level within the Coffeeae. However, wood of Coffea arabica and Coffea liberica can be distinguished on the basis of their ray composition. Little variation is observed in the micromorphology of vestures. Aluminium accumulation is absent from the wood of all species studied
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