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この種は、わが国の本州から北海道に分布する「ちしまざさ(千島笹)」の稈に、「圏紋菌」が寄生して、淡褐色の同心円の斑紋を生じたものです。別名で「とらふねまがりたけ(虎斑根曲竹)」とも呼ばれます。日野巖氏によれば、この原因菌は「圏紋菌」ではなく、「竹類圈紋病菌」とのことです。
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イネ科ササ属の常緑ササ類で、学名は Sasa kurilensis。英名はありません。
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The "Kenmon-chiku" (Sasa kurilensis) belongs to Poaceae (the Grass family). It is an evergreen shrubby bamboo. This species is produced when the "Chishima-zasa" that is distributed from Honshu to Hokkaido in Japan is parasitized by "Micropeltis bambusicola", resulting in a light brown concentric pattern on the culms. It is also known as "Torafu-nemagari-dake" in Japan. According to Mr. Iwao Hino (1898-1985), the causal agent is not "Micropeltis bambusicola", but rather "Phragmothyrium bambusicolum".
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茨城県つくば市「森林総合研究所樹木園」にて、2024年11月29日撮影。
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