Department of Fundamental Natural Science, Okayama University of Science
Abstract
Karyomorphological observations are carried out in 6 taxa of Japanese Eleocharis. The following three types are recognized : 1) Eleocharis mamillata var. cyclocarpa (2n=16). Interphase nuclei show round prochromosome type. The 16 metaphase chromosomes show bimodal variation. 2) E. wichurae (2n=20), E. tetraquetra (2n=20), E. acicularis (2n=20) and E. congesta var. thermalis (2n=20). Interphase nuclei show complex chromocenter type. Karyotypes of these four taxa show gradational variation. 3) E. kuroguwai, 2n=ca.196 Interphase nuclei show sparsely diffuse type. All metaphase chromosomes are very small, under 0.7μm in length. The karyomorphological characteristics of interphase nuclei and metaphase chromosomes are found to be closely correlated with the taxonomical treatment of section
