• Proposed
  • 2Under Assessment
  • 3Preliminary Assessed
  • 4Assessed
  • 5Published

Chrysothrix xanthina (Vain.) Kalb

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Scientific name
Chrysothrix xanthina
(Vain.) Kalb
Common names
IUCN Specialist Group
Assessment status
Proposed by
Isaias de Oliveira Junior
Comments etc.
Isaias de Oliveira Junior

Assessment Notes

Taxonomic notes

This species is known by its bright yellow thallus, adnate, diffuse, and irregularly spreading. Apothecia reported as rare but observed by Vainio, 1901, and Kalb, 2001. Also, this is known as a common species occurring in natural areas and also open sites.

Why suggested for a Global Red List Assessment?

This is species is known in 33 countries, with 935 records in GBIF database. Also, this species occurs on trees bark and rocks in Tropical Rainforest. In Brasil, this species records are related to Atlantic and Amazon Rainforest. Due to all the previous information this species might be considered as Least Concern (LC).

Geographic range

This is species is known in 33 countries. In Brazil, 25 occurrences to this species are known, located in the North, Northeast, Midwest and South of Brazil according to GBIF database.

Population and Trends

There are 935 records in GBIF database, distributed in the United States of America (532 records), Australia (221 records), Brazil (2 records), Colombia (8 records), French Guiana (6 records each), and the other occurrences are distributed in small percentages.

Population Trend:

Habitat and Ecology

This species occurs on bark and rock in Tropical Rainforest. Also, some records show that this species occurs in disturbed area such as roadsides, and on exotic trees. In Brazil, this species can be found at the Atlantic and Amazon Rainforest, and Dry Forest (Cerrado and Caatinga) in North, Northeast, Midwest and Southeats of Brazil.

Subtropical/Tropical Dry ForestSubtropical/Tropical Moist Lowland ForestSubtropical/Tropical Moist Montane Forest


In Brazil, this species can be founded in Atlantic Rainforest and Amazon Rainforest that are biomes that still suffer anthropic actions in special wildfire, natural and criminal caused, and area suppression.

Housing & urban areasTourism & recreation areasSmall-holder farmingAgro-industry farmingSmall-holder plantationsAgro-industry plantationsRoads & railroadsUnintentional effects (species being assessed is not the target)Increase in fire frequency/intensityHabitat shifting & alteration

Conservation Actions

In Brazil, the records are related to preserved areas, but unfortunately, those spaces still being affected by negatives influences. So, formal education to the population that lives near those areas and the park managers can start to change the situation.

Resource & habitat protectionSite/area management

Research needed

Actions that are orientated to taxonomy and exploration to new sites need to be stimulated until a better understanding of this species status.

TaxonomyPopulation size, distribution & trends

Use and Trade



Country occurrence

Regional Population and Trends

Country Trend Redlisted