Anatomical studies on the wood of Japanese Quercus I On subgenus Lepidobalanus

Shimaji, K.

Bull Tokyo Univ Forests 46: 193-210


Accession: 030074236

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Genus Quercus, 8 Japanese spp. of subgenus Lepidobalanus, i.e.,Q. acutissima (Kunugi), Q. variavilis (Abemaki), Q. phylliraeoides (Ubamegashi), Q. crispula (Mizunara), Q. aliena (Naragashiwa), Q. mongolica (Mongorinara), Q. dentata (Kashiwa) and Q. serrata (Konara) were studied and descrs. given of wood-anatomical characteristics of each spp.; (2) processes of ontogenetic development of primary broad rays where three types of developmental processes occur each of which is characteristic for one of the 3 sections of the Japanese sp. of Lepidobalanus; (3) Japanese spp. of subgenus Lepidobalanus are separated into 3 groups, which are correspondent to the 3 sections offered taxonomically, on the base of the anatomical characteristics of the adult wood as well as on ray development. Wood of section AEGILOPS is ring porous and has thick-walled and rounded summer wood vessels and compound broad rays; that of section ILEX is radial porous and has aggregate broad rays; that of section PRINUS is ring porous, and has thin-walled and angular summer wood vessels and compound broad rays; (4) Confusion arises between wood-anatomical and taxonomical separation when the subgenera Cyclobalanopsis and Erythrobalanus are considered. Sections AEGILOPS and ILEX of Lepidobalanus have the wood of Erythrobalanus type and Cyclobalanopsis type, respectively, while section PRINUS alone has the wood of the typical Lepidobalanus type. This situation may suggest the necessity of reconsidering the taxonomic segregation of the spp. of genus Quercus as a whole. Finally, a key to above-mentioned 8 spp. based on wood anatomical characteristics is presented.