Cantharellus griseotinctus is currently only known from the forest of Analalava to the west of Mahavelona in eastern Madagascar. This site is a biodiversity hotspot, and there are several palm species that are restricted to this region of Madagascar. Even though the host species of C. griseotinctus is not known, there is a chance that it could have similar ecological requirements and could be restricted to this area. Even if it is more widespread then it is most likely to be severely fragmented due to ongoing habitat loss in eastern Madagascar. Therefore, this species most likely warrants listing under a threatened category. Precautionarily, C. griseotinctus is treated as restricted to this one location, and based on current information it has a minimum area of occupancy and extent of occurrence of 4 km2. Therefore, C. griseotinctus is assessed as Critically Endangered under criteria B1ab(iii)+2ab(iii).
Why suggested for a Global Red List Assessment?
This species appears to be known from only the type specimen, collected to the west of Mahovelona on the east coast of Madagascar at Analalava (Hyde et al. 2019). This site is known to be a hotspot for other taxonomic groups (e.g. palms, Rakotoarinivo et al. 2010). Indeed some of the palm species that occur at this site are restricted to this region, while others that are more widespread are severely fragmented (Rakotoarinivo et al. 2010). While no relationship between this species and palms was noted in the type description, there is a chance that it could have similar ecological requirements. So we may suspect that either its range is very small, or severely fragmented. Based on the fact that there is only one known specimen the area of occupancy and extent of occurrence would both be 4 km2. However, if it is restricted to this region of Madagascar then the maximum for each may not exceed 100 km2.
Population and Trends
Population size is unknown, although it may be very small. It is suspected to be in decline as a result of ongoing threats to lowland forest in eastern Madagsacar.
Population Trend: Decreasing
Habitat and Ecology
This species was collected from low altitude forest in the humid zone of eastern Madagascar (Hyde et al. 2019). It was found in small groups on a steep, muddy slope amongst herbs (Hyde et al. 2019)
Subtropical/Tropical Moist Lowland Forest
While the type locality has been managed by Missouri Botanical Garden since 2012 (Rakotoarinivo et al. 2010), the wider region has suffered from rapid deforestation due to land conversion for agriculture and logging. Wildfires may be an additional threat (FAPBM 2021).
Shifting agricultureSmall-holder farmingUnintentional effects: subsistence/small scale (species being assessed is not the target) [harvest]Increase in fire frequency/intensity
The type locality has been managed by Missouri Botanical Garden since 2012 (Rakotoarinivo et al. 2010). Ensuring continued protection of the site, is important, in addition to engagement with local stakeholders to try to reduce the impacts of anthropogenic activities on natural vegetation.