ESTUDIO ANATÓMICO DE LA MADERA DE 21 ESPECIES DEL GÉNERO VOCHYSIA POIR. (VOCHYSIACEAE)

Resumen

RESUMEN 

Se realizó el análisis anatómico de la madera de 21 especies del género Vochysia. Las especies estudiadas se caracterizaron por presentar una estructura muy homogénea entre sí y no es posible su diferenciación con base en la estructura xilemática. Los caracteres más comunes fueron: tipo de parénquima axial, radios de dos tamaños, punteaduras ornadas y conductos gomíferos longitudinales. En V. lehmanii y V. venezuelana se observó la presencia de drusas en los conductos gomíferos longitudinales. Este podría ser el primer reporte sobre la presencia de este tipo de cristal en el género Vochysia y el primer reporte acerca del desarrollo de cristales en este tipo de estructura secretora. En V. cayennensis y V. venezuelana se observó el desarrollo de trabéculas.

ABSTRACT 

This paper deals about wood description of 21 species from the genus Vochysia. Woods of this genus are very homogeneous making the identification using wood features difficult. In all the studied species the same parenchyma types, rays of two distinct sizes, vestured pits and axial canals were observed. In V. lehmanii and V. venezuelana druses in axial canals were observed, and this could be the first report about this crystal type in Vochysia and the first report about the presence of crystals in axial canals. In V. Cayennensis and V. venezuelana trabeculae were found, and this could be the first report about it.

ABSTRACT 

Morphological and anatomical information for six species of Gnetum were investigated to understand which features are important for taxonomic delimitations. Morphological characterization and observations were made using stereoscopic microscopy, following the conventional methodology for taxonomic studies. For anatomic studies, the material was prepared using traditional methods, and examined with a compound microscope. Morphologically, the species are distinguished by stem cortex surface, length of internodes, size of leaves, seed color and form and number of cotyledons. Distinctive anatomical characters are: the presence of hypodermis; crystals; the density, and degree thickness of the cell walls of the sclerenchymatous cells in the mesophyll, and the number of vascular bundles in the midrib. An artificial key based on morphoanatomical characters is presented.