抄録
Nuts of the Siebold walnut, Juglans ailanthforia, were found at a midden of the Japanese field mouse, Apodemus speciosus ainu, on April 13th in 1983 along a strem and were seeded the very day at a nursery bed at different depths. 1) The germination of the walnut is hypogeous. The seedlings could grow from the nuts seeded at the depth of 30 cm at the bed. 2) Nuts that were stored by the mouse into the midden, about 25 cm in depth, seem to stay in dormancy, because of the shaded forest floor. 3) The nut has a hard shell and fatty cotyledons and can keep germinative capacity more than 2 years in the deep, cool and moist soil. 4) From the points of view of the hypogeal germination out of deep soils and the dormancy for a few years in soils, nuts of the walnut seem to have been adapted to synzoochory, catching by animals, better than the acorns of oaks, Quercus species.
