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

Circinotrichum olivaceum (Speg.) Piroz.

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Scientific name
Circinotrichum olivaceum
(Speg.) Piroz.
Common names
IUCN Specialist Group
Cup-fungi, Truffles and Allies
Incertae sedis
Incertae sedis
Incertae sedis
Assessment status
Proposed by
Marcela Barbosa
Comments etc.
Marcela Barbosa, Elaine Malosso, David Minter

Assessment Notes

Taxonomic notes

Circinotrichum olivaceum (Speg.) Piroz presents setae erect, circinate, unbranched, verrucose, conidiophores micronematous, flexuous, subhyaline to pale brown, smooth, conidiogenous cells polyblastic, discrete, percurrent, obclavate to lageniform, colourless and conidia forming a whitish layer at the base of setae, cylindrical to fusiform, straight or slightly curved, aseptate, hyaline, smooth (Pironzynski, 1962; Ellis, 1971).

Why suggested for a Global Red List Assessment?

Circinotrichum olivaceum is known from several countries around the world, but always related to decomposing plant material. Therefore, it could be considered of least concern.

Geographic range

Distribution: subtropical and tropical regions

Population and Trends

Currently the genus comprises 21 species. Circinotrichum olivaceum is common in the tropics leaf litter decomposing in the forest floor (Pirozynski 1962, Sutton 1980, Mercado-Sierra 1984, Grandi; Silva 2006). There is also record in aquatic environment, in Australia (Hyde 1997).

Population Trend: Uncertain

Habitat and Ecology

This species is collected associated with leaf litter.

Subtropical/Tropical Moist Lowland Forest


Unintentional effects (species being assessed is not the target)Work & other activitiesOther threat

Conservation Actions


Site/area protectionResource & habitat protection

Research needed

There is no report of this species in the deserts of the world and Antarctica. In Brazil, there is no record in the cerrado, rupestrian fields, ecosystems associated with the Atlantic rainforest such as tableland, sandbanks and mangroves.

TaxonomyPopulation size, distribution & trendsLife history & ecologyThreatsActions

Use and Trade



Country occurrence

Regional Population and Trends

Country Trend Redlisted