Summary
This paper is the continuation of a series of studies on Guttiferae of the Amazon Region. In this contribution is studied the petiole, the leaf-blade, and the stem of Lorostemon coelhoi, Caraipa valioi, and Clusia aff. macropoda; the wood of C. valioi and Lorostemon coelhoi, and aerial root of Clusia aff. macropoda. Among the principal results the following are the most important: secretory canals are schizolisigenous in three species, and schizogenous in the root of Clusia aff. macropoda. Caraipa valioi and Clusia aff. macropoda have sclerosed hypoderm; crystals of calcium-oxalate in redissolution appear simultaneously in process of lignification, in hypodermal cells of Clusia aff. macropoda; sub-epidermis-phellogeny in the aerial root of Clusia aff. macropoda; Clusia aff. macropoda and Caraipa valioi are sclerophyllous.