| Summary: | 碩士 === 國立嘉義大學 === 森林暨自然資源學系研究所 === 96 === II
The classification of genus Eurya in Taiwan is somewhat
controversial and usually emphasized on the external morphological
characters. So, the offer of additional evidences for taxonomy is really
in need, especially on wood anatomy.
In this study, wood anatomic characters of 17 native species of
Eurya were studied. Both gross features and microscopic structures
were examined and photographed from different sections and
macerated materials. Description on general features and
microcharacters of each species were presented. Data were then
analyzed with cluster methed and F/V ratios were also counted. The
results are summarized as follows:
1. The general wood anatomic characters of Eurya are : diffuse
porous, pores solitary or 2-3 in multiple, intervessel pits opposite,
vessel-elements with oblique perforation plate with numerous
scaraliform bars; with fiber-tracheids; without libriform fibers and
septate fibers; with scanty longitudinal parenchyma; rays uniseriate
and multiseriate.
2. The cluster analyses based on the Euclidian distance equation and
wood anatomic character showed that Taiwan Eurya could be
distinctly demarcated into 17 species with critical coefficient value
at 16.03, but the discrimination among ranks of sections and series
were indistinct. It also showed that their wood anatomic characters
were highly similar.
3. The F/V ratio (ratio of length of accompanying fiber to vessel
element) in this genus was from 1.285 (E. glaberrima) to 1.747 (E.
septata). It also showed the primitive wood anatomic characters of
Eurya.
In this paper, descriptions on general feature and microscopic
characters as well as color photographs of each species were presented.
And an indentification key was presented. These could be useful to the
sysmatic classification and wood identification for Eurya.
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