• Proposed
  • Under Assessment
  • LCPreliminary Assessed
  • 4Assessed
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Favolus rugulosus Palacio & R.M. Silveira

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Scientific name
Favolus rugulosus
Palacio & R.M. Silveira
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Preliminary Assessed
Preliminary Category
Proposed by
Denis Zabin
Denis Zabin, Thiago Kossmann, Maria Eduarda de Andrade Borges, Nelson Menolli Jr
E. Ricardo Drechsler-Santos, Kelmer Martins da Cunha, Gregory Mueller

Assessment Notes


Favolus rugulosus is a conspicuous polypore described in 2021 based on collections from Brazil and Colombia, being widely distributed throughout the Neotropics up to the Southern USA in the state of Florida, although not so represented in public fungaria. It grows in preserved and disturbed remnants of montane or coastal humid forests, in seasonal semideciduous forests, and also in urban areas. Considering its ample distribution in tropical America, based on collections and records in biodiversity databases, from both preserved and disturbed forest remnants, no sign of decline or direct threats to this species were detected. It is assessed as Least Concern (LC).

Taxonomic notes

Favolus rugulosus Palacio & R.M. Silveira, in Palacio, Drechsler dos Santos, Menolli Jr. & Borges Da Silveira, Mycologia 113(4): 767 (2021)

Why suggested for a Global Red List Assessment?

Favolus rugulosus is a recently described remarkable and conspicuous polypore with robust basidiomata and gregarious growth, being distributed throughout the Neotropical region, although not so represented in public fungaria. Considering the wide distribution of this species in the Neotropics, and its importance as an edible mushroom species with potential for commercial cultivation, its threat level should be assessed.

Geographic range

Favolus rugulosus was recently described based on collections from Brazil and Colombia (Palacio et al. 2021), being also known from Ecuador (Vandegrift et al. 2023) and Paraguay (Veloso et al. 2023), with additional verified records in biodiversity databases such as iNaturalist, in Argentina, Costa Rica, Mexico, Panama, Peru, and in the southern USA (GBIF 2024).

Population and Trends

There are currently 19 collections of F. rugulosus in the Neotropics, fifteen from Brazil, two from Colombia, one from Ecuador, and one from Paraguay. Additionally, there are another 49 verified records of this species in biodiversity databases, such as iNaturalist, in Brazil, Colombia, Costa Rica, Ecuador, Mexico, Panama, Peru, and the USA (GBIF 2024). This is a species with medium to high detectability due to its conspicuous, robust basidiomata, and gregarious growth. Given its extensive occurrence in both preserved and disturbed or urbanized areas across the Neotropics, reaching the southern state of Florida in the USA, coupled with its disjunct distribution likely attributed to insufficient sampling in certain areas, there is no evident indication of population decline or significant threats to the F. rugulosus population. Calculating the total number of sites where this species occurs as well as inferring its population size proves challenging due to its potentially widespread occurrence across tropical America.

Population Trend: Uncertain

Habitat and Ecology

Favolus rugulosus is an annual and generalist wood decaying polypore causing white rot. Basidiomata of this species are frequently found gregariously on dead-standing trees or fallen decaying logs of medium to large diameter in both preserved and disturbed ombrophilous and seasonal semideciduous forest remnants.

Subtropical/Tropical Moist Lowland ForestSubtropical/Tropical Moist Montane ForestRural GardensUrban AreasSubtropical/Tropical Heavily Degraded Former Forest


Due to the wide distribution in the Neotropical region and its occurrence in the south of Florida in the USA, in both preserved and disturbed areas, it is suspected that there are no direct threats to this species and its population size is likely stable. Despite this, its natural habitat throughout its potential distribution, such as the Atlantic and Amazon Forests, is continuously being threatened through deforestation, fragmentation (Lapola et al. 2023; Rezende et al. 2018), introduction of exotic and invasive species, increased fire frequencies and intensity of droughts due to anthropogenic climate change (Brooks and Balmford 1996; Lapola et al. 2023; Tabarelli et al. 2006; Pinto et al. 2006).

Housing & urban areasAgro-industry plantationsAgro-industry grazing, ranching or farmingUnintentional effects: large scale (species being assessed is not the target) [harvest]Increase in fire frequency/intensityDroughts

Conservation Actions

The species most likely does not require directed conservation actions. However, in order to keep its population stable, its natural habitat should be conserved.

Site/area protectionResource & habitat protectionHabitat & natural process restoration

Research needed

Species within Favolus are generally regarded as wood-decay angiosperm generalists, but host specificity is poorly investigated for the genus, requiring further studies. Revision of fungaria specimens may reveal more records and help elucidate the species distribution and population.

Population size, distribution & trendsLife history & ecology

Use and Trade

Favolus rugulosus is reported as an edible species, and it has potential for being commercially cultivated for food (Palacio et al. 2021; Sanchez-Ocampo et al. 2022; Veloso et al. 2023), but it is not widely consumed nor commercially traded

Food - human


Country occurrence

Regional Population and Trends

Country Trend Redlisted