The studies presented in this volume are meant to The reason why we know relatively little about close some gaps in our knowledge of leaf anatomy inner leaf structure of trees from tropical humid of trees in tropical humid forests. Although xero­ forests is that the leaf anatomy of only a few species morphy of the foliage in tropical humid forests has or genera or - at the most - of an entire family has been much discussed, the statements have generally been studied in detail up to the present. Most of been based on sporadic anatomical studies of part i­ these studies are, therefore, of taxonomic interest. cular species or genera, a complete area of the size They cannot be included in this study because they of 155. 5 ha has certainly never been considered. do not supply the same information or amount of The present studies analyse an entire inventory of a data presented here. Anatomical studies are very time consuiming because the material first has to be given region in which the number of species and the number of individuals is very well known. This fact prepared and cut before observation can begin. In­ allows the elaboration of many ecological aspects, vestigation of about 50 characteristics in 230 species which was the main intention of the author.