Bonin Islands Campanella Mushroom (Campanella boninensis)  

This species is known from a single locality on the island of Chichijima in the Ogasawara group, Japan. 

The species is considered extinct. [1]

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References:  

[1] Kentaro Hosaka; Takahito Kobayashi; Michael A. Castellano; Takamichi Orihara: The status of voucher specimens of mushroom spwcies thought to be extinct from Japan. Bulletin of the National Museum of Nature and Science Ser. B 44(2): 53-66. 2018

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edited: 31.08.2020