Hemiglossum yunnanense is known only from the type specimen.  It has not been found since the original collection made in 1889 in spite of concerted effort over 20 years (since 2000) to find the species. It is included in the Chinese fungal red list as potentially extinct (Yao et. al., 2020; Zhuang et. al., 2020).  It is assessed as probably extinct.

Synonym: Microglossum yunnanense (Pat.) Sacc. (1897)
Hemiglossum yunnanense was firstly described by Patouillard (1890). The type was collected from Cangshan, Dali City, Yunnan Province, China. There is only one specimen in the world. It is now deposited at Farlow Herbarium (FH), Harvard University.
So far, it has only been recorded in Yunnan. In the red list of China’s macrofungi, H. yunnanense has been assessed as Possibly Extinct (PE) (Yao et. al., 2020; Zhuang et. al., 2020).

After the description of the species in 1890, no additional collections have become available in the last more than 100 years, although repeat excursions were made in or near the type locality. Based on this fact, H. yunnanense was evaluated as PE in China.

Only reported for the type locality, namely Cangshan, Dali City, Yunnan Province, China.  The species was described in 1889 but has not been found again. Based on the description it is a distinctive species, and it has been searched for over a number of years to no avail.

The species has not been found since the original report in 1890. It has been the focus of intensive survey work in the type locality and surrounding area.  It is included in the Chinese fungal red list as potentially extinct (Yao et. al., 2020; Zhuang et. al., 2020).

The type description states only states that it is terrestrial.  An examination of the type specimen reveals moss at the base of the stipe.

The main threat to H. yunnanense is the change of the original habitat due to human activities and drying due to climate changes.

None identified.

Continued surveys to re-find the species.