メタセコイアの樹皮, 特に巨大コルク細胞について
1961 年 74 巻 881-882 号 p. 514-518
詳細
1961 年 74 巻 881-882 号 p. 514-518
1. The bark of the twigs of Metasequoia cracks lengthwise when it is about one year old, while the bark of two to four year old twigs splits in rings. The thick periderm which covers the trunk splits vertically and gradually sloughs away from the surface.
2. The surface of the bark of 2-4 year old twigs which peels off in rings is covered with numerous brown particles. These particles are giant cork cells. They are spherical or ellipsoidal in shape and averaging about 14, 600μ2 in their surface area. Those cells originate from the expanded parenchyma of the bast, taking a spherical or ellipsoidal shape and then separate from the tissue. The phenomenon is characteristic of the bark of Metasequoia.
3. The first cork cambium initiates in the middle of the cortex and the 2nd periderm arises from the pericycle. The periderm of twigs of more than three years old originates in the phloem.
