False annual ring - Ginnenrin (English spelling) false annual ring

Japanese: 偽年輪 - ぎねんりん(英語表記)false annual ring
False annual ring - Ginnenrin (English spelling) false annual ring
Trees normally grow one annual ring each year, with the growth sparse and dense with the change in spring and autumn, but sometimes an extra ring may appear in a year due to extreme weather, insect damage, wind damage, etc. These are called false rings, and can be distinguished from false rings because the transition from coarse to dense tissue is not very clear from an anatomical point of view.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
樹木は春秋の変化に従って生長に疎密を生じ,1年に1つずつの年輪を生じるのが正常であるが,気候の著しい不順や虫害,風害などにより,年間に余分の年輪を生じることがある。これを偽年輪というが,解剖学的にみるとそのあらい組織から密な組織への移り変りがあまりはっきりしていないので区別できる。

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