Gymnopilus noviholocirrhus S. Ito & S. Imai

Hahajima Gymnopilus (Gymnopilus noviholocirrhus)
 
This species was described in 1940; it is known only from a single locality on the island of Hahajima in the Ogasawara Islands, Japan, where it was found growing on the Bonin Islands Hackberry (Celtis boninensisKoidz.).

The species was apparently not found again since and is considered most likely 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: 26.04.2022