Graduate Thesis Or Dissertation
 

Comparative wood anatomy of the Fagaceae of Taiwan

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  • Many species of the Fagaceae have been variously interpreted on the basis, primarily of external morphological characteristics. The objectives of this study are to elucidate generic and specific characteristics of the wood of Fagaceae and to attempt to obtain evidence regarding taxonomic relationships among some of the species occurring in Taiwan that have been variously interpreted. There are 45 species (Lin and Liu, 1965) of Fagaceae, subdivided to seven genera, in Taiwan and 35 of these were obtained for study. Detailed descriptions are provided for all species and differences among species and genera are emphasized. On the basis of comparative wood anatomy of the species studied, several suggestions are made regarding relationships of certain species. The wood anatomy of Pasania uraiana (Hay.) Schottky is very similar to that of Castanopsis and quite different from the anatomy of other species of Pasania or of Lithocarpus. The cupula is cuplike, however, so that it differs in this important generic character from Castanopsis. It probably should be treated under a distinct genus, Limlia, as Masamune and Tomiya (1947) suggested. The comparison of wood anatomy between Pasania dodoniaefolia and Pasania formosana shows consistent differences. Pasania dodoniaefolia shows distinct growth rings, homogeneous rays and absence of crystals in the parenchyma cells. Pasania formosana shows indistinct growth rings, heterogeneous rays and presence of crystals in parenchyma cells. Since the morphological characters are also somewhat different (Lin and Liu, 1965), they probably should be treated as two distinct species. Morphologically, Castanopsis carlesii var. sessilis is very similar to Castanopsis carlesii, but is quite different with regard to wood anatomy. Since Castanopsis carlesii var. sessilis has ring porous wood, conspicuous growth rings and pore size transition abrupt, while Castanopsis carlesii has diffuse porous wood, inconspicuous growth rings, pore size transition gradual, these should be considered as separate species and the original name, Castanopsis stipitata should be recognized as the valid name. The genera Lithocarpus and Pasania could not be separated anatomically. These genera have been separated primarily on the basis of the cupula but they are very similar with regard to other morphological characteristics. If both anatomy and external morphology are considered, these should be treated as one genus, Lithocarpus.
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