Quercus glabrescens

Abstract: Histochemical and some quantitative features of sapwood and heartwood cells of Quercus glabrescens, Q. potosina y Q. eduardii are described. The trees were collected in different sites of Huayacocotla, in Veracruz State. The results show that sapwood of the species are very similar in histochemical and quantitative trends but heartwood differ on chemical deposits of gelatinous fibers, and violet deposits of polisacharids present on rays and also the petrification processes in Q. potosina rays. Cell wall quality and the relationship between dimensions and types of chemical compounds are discussed as well.

Abstract: Wood anatomy of Quercus glabrescens Benth. and Q. potosina Trel., belonging to Leucobalanus subgenus ( white oaks), as well as that of Q. eduardii Trel., Q. ghiesbreghtii M. Martens & Galeotti and Q. xalapensis Humb. & Bonpl., belonging to Erythrobalanus subgenus (red oaks) is described from material collected in the municipality of Huayacocotla, Ver. The results obtained show differences in wood color, porosity characteristics, multiseriate ray sizes and in the type and abundance of extractives.

Abstract: Resumen es: Se estudio el hibrido putativo Quercus glabrescens Benth. x Q. rugosa Nee., a traves de un indice de hibridacion morfologico y comportamiento meiotico. E...

Abstract: Quercus species are prone to form hybrids very frequently in different parts of the world. The Quercus glabrescens x Q. rugosa hybrid was studied in terms of habitat (geographic distribution and species association) and of the Morphologic Hybridization Index. With the distribution of Q. glabrescens and Q. rugosa was obtained a bioclimatic model of minimum average temperature and winter rainfall per cent. At El Chico National Park, Hidalgo State, Mexico, eight lots were surveyed and in each of them was determined frequency, cover, basal area, stem volume and dominance index of the tree species. Ten morphologic characters were assessed in 50 examples (alleged hybrids). The bioclimatic model showed that Q. glabrescens has a greater preference for zones where low minimum average temperatures prevail and with winter rainfall per cent higher than Q. rugosa. A common zone with ecologic affinities was found. Through Pearson correlation and the Principal Component Analysis, diverse habitats were detected with species association and hybrid category. Trees with a tendency for Q. glabrescens or in-between were found. The first showed ecologic affinities similar to Q. glabrescens and the second expressed flexibility. Evidence is reported about the natural hybridization between Q. glabrescens and Q. rugosa.