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Dendrothele pitrae Gresl. & Rajchenb.

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Scientific name
Dendrothele pitrae
Author
Gresl. & Rajchenb.
Common names
 
IUCN Specialist Group
Mushroom, Bracket and Puffball
Kingdom
Fungi
Phylum
Basidiomycota
Class
Agaricomycetes
Order
Corticiales
Family
Corticiaceae
Assessment status
Published
Assessment date
2020-04-01
IUCN Red List Category
NT
Assessors
Greslebin, A., Kuhar, F., Pfister, D. & Truong, C.
Reviewers
Mueller, G.M.

Assessment Notes

The content on this page is fetched from The IUCN Red List of Threatened Species: https://www.iucnredlist.org/species/172733295/172861067

Justification

This species appears to have a discontinuous spread, with the majority of records coming from areas with Myrceugenia exsucca in central Patagonia. There is evidence that the species may also occur in Tierra del Fuego on different hosts, but genetic work is needed on individuals occurring there to confirm that it is conspecific and those individuals are precautionarily not considered in this assessment. The overall population size is fairly small (c.16,020 - 40,050), but this comes with some uncertainty; and more work is needed to confirm the subpopulation structure in the northern part of its range. The likely population size is closer to the low end of this estimate. Thus, the species is assessed as Near Threatened under criterion C2a(ii).

Geographic range

This species is known from few localities in Argentina: Chubut, Lago Puelo (SPG 2789); Chubut, Cushamen, Epuyen (AG 1084, holotype); Neuquén, Nahuel Huapi National Park, Puerto Blest (SPG 2906); Río Negro, El Bolsón (MR 11220). Its main host (Myrceugenia exsucca) is associated with water courses, temporary flooded lands and marsh areas. Stands of M. exsucca in Chubut were surveyed and the species was recorded in 75 % of them. It has been searched for but not found in Chile (Gorjón and Hallenberg 2012). There is a record in one locality in Tierra del Fuego (Estancia Moat, Depto. Ushuaia, Argentina), growing on Berberis ilicifolia and Maytenus magellanica, but these records are not included within the assessment pending genetic confirmation.

Population and Trends

The species is known from less than 10 collections. The population is suspected to be decreasing as the host tree is likely in decline. The species has been found at 75% of surveyed sites in the northern part of its range, but only on a limited percentage of trees at each site. Based on the potential range of the main host in the northern part of the species’ range and assuming 2 mature individuals per host tree,  the overall population size in the northern part of its range could be in the range c.16,020 - 40,050 mature individuals. The small isolated subpopulation in Tierra del Fuego would not significantly increase this estimate.

Population Trend: decreasing


Habitat and Ecology

This species grows on the bark of living Myrceugenia exsucca. The records from Tierra del Fuego wer found on Berberis ilicifolia and Maytenus magellanica.

Threats

The species’ host, Myrceugenia exsucca, is a very hydrophilic species, occurring next to rivers, lakes and estuaries, especially in temporarily flooded lands, in sites frequently altered by the action of man and by the construction of recreational areas, campsites, jetty areas etc. Therefore, this presents some degrees of vulnerability and threat. Any increase in drought frequency due to climate change would significantly impact the species’ host. Fires can also pose a threat.

Conservation Actions

Protection of the species’ host is important for this species’ conservation as would wider-spread protection of habitat in the region. A fuller understanding of the species’ geographic distribution needs to be assessed, especially in Chile, as well as knowledge of factors affecting its limited distribution within the host range. An assessment of the genetics of the subpopulation in Tierra del Fuego is important to confirm its presence within this species, and to help to define the limits of its range. Further research into the life history of the species would be useful, in order to assess dispersal ability and the connectivity of different habitat patches in the northern part of the range.

Use and Trade

There is no use/trade of this species.

Source and Citation

Greslebin, A., Kuhar, F., Pfister, D. & Truong, C. 2020. Dendrothele pitrae. The IUCN Red List of Threatened Species 2020: e.T172733295A172861067. https://dx.doi.org/10.2305/IUCN.UK.2020-3.RLTS.T172733295A172861067.en .Accessed on 31 January 2022

Country occurrence