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Parmotrema bifidum A.A. Spielm. & Marcelli

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Scientific name
Parmotrema bifidum
Author
A.A. Spielm. & Marcelli
Common names
 
IUCN Specialist Group
Lichens
Kingdom
Fungi
Phylum
Ascomycota
Class
Lecanoromycetes
Order
Lecanorales
Family
Parmeliaceae
Assessment status
Published
Assessment date
2021-11-15
IUCN Red List Category
CR
IUCN Red List Criteria
B1ab(iii)+2ab(iii); D
Assessors
Spielmann, A., Costa-Rezende, D.H., Drechsler-Santos, E.R., Gumboski, E.L. & Kossmann, T.
Reviewers
Allen, J.

Assessment Notes

The content on this page is fetched from The IUCN Red List of Threatened Species: https://www.iucnredlist.org/species/209742938/210566572

Justification

The lichen species Parmotrema bifidum is known only from the type locality, where it was collected in Chapada dos Guimarães National Park, Mato Grosso, Brazil in 1894. The species was formally described only in 2020, and has not been found elsewhere (one location). Despite an extensive herbaria review and further surveys in the type area, this species has never been found again. It seems that Parmotrema bifidum has/had a very narrow distribution, possibly being endemic to the Mato Grosso highlands. The species was found growing on rocks in shady areas, and despite occurring within an area protected by national park restrictions, fires that originate from nearby agriculture plantations often become wild and result in habitat loss in the highlands. Therefore, there is a relatively high probability that this species may be already Extinct. Further surveys are required to confirm this, but if it is found to still be extant its persistence depends on the creation of more protected areas and better management of wildfires and forest conservation. Overall, P. bifidum is assessed as Critically Endangered (Possibly Extinct).

Geographic range

Parmotrema bifidum is known only from the type locality (Chapada dos Guimarães, MT). It was collected in central Brazil in 1894 by the famous lichenologist G.O. Malme, and formally described only in 2020. It is thought that Parmotrema bifidum has/had a very narrow distribution, being possibly endemic to the Mato Grosso highlands. Several famous lichen collectors, including Klaus Kalb, Marcelo Pinto Marcelli and André Aptroot, visited the type locality and did not collect this species again (see for example Aptroot and Souza 2021). Despite an extensive herbaria review, this species was never found again, despite being a very characteristic species of the genus Parmotrema.

Population and Trends

The entire population is presumed to be completely extirpated. No individuals have been observed since 1984, and if it persists it is likely to occur in tiny numbers.

Population Trend: unknown


Habitat and Ecology

This is a saxicolous lichen that grows over rocks in shadow habitats at the mountain area in the Chapada dos Guimarães region. It is thought that Parmotrema bifidum has a very narrow distribution, being possibly endemic to the Mato Grosso highlands.

Threats

Central Brazil is being increasingly threatened by habitat loss, especially by the extensive monocultures and associated fires. Fires are often used as a tool for clearing land for plantations, but get out of control and can impact protected areas where Parmotrema bifidum could occur. There is evidence that suggests that wildfires in Brazilian savannas are impacting lichens (Mistry 1998).

Parmotrema bifidum was probably collected in the area that now belongs to the Chapada dos Guimarães Park, a protected area with 327.7 km2 (32,769 hectares). Even being a protected area, the occurrence of fire on it occurs annually.

Conservation Actions

Conservation actions should include the creation of adjacent protected areas and better management of wildfires and subsequent forest destruction. More studies are needed for a better estimation of the existing population, especially exploration at the type locality and adjacent areas. Additionally, information on ideal growth conditions and ecology of Parmotrema bifidum is still unknown due to its rarity, and is needed for its conservation. An area-based management plan should be created, and monitoring of population and habitat trends should be prioritized.

Use and Trade

Species is not used or traded.

Source and Citation

Spielmann, A., Costa-Rezende, D.H., Drechsler-Santos, E.R., Gumboski, E.L. & Kossmann, T. 2022. Parmotrema bifidum. The IUCN Red List of Threatened Species 2022: e.T209742938A210566572. https://dx.doi.org/10.2305/IUCN.UK.2022-1.RLTS.T209742938A210566572.en .Accessed on 4 August 2023

Country occurrence