• Proposed
  • Under Assessment
  • DDPreliminary Assessed
  • 4Assessed
  • 5Published

Binderoboletus segoi T.W. Henkel & Husbands

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Scientific name
Binderoboletus segoi
Author
T.W. Henkel & Husbands
Common names
 
IUCN Specialist Group
Mushroom, Bracket and Puffball
Kingdom
Fungi
Phylum
Basidiomycota
Class
Agaricomycetes
Order
Boletales
Family
Boletaceae
Assessment status
Preliminary Assessed
Preliminary Category
DD
Proposed by
Bryn Dentinger
Assessors
Bryn Dentinger, Terry Henkel, Matthew Smith
Comments etc.
Janet Scott
Reviewers
Giuliana Furci

Assessment Notes

Justification

This species is known from two sites in Guyana, where a tiny fraction of its possible suitable habitat has been surveyed. Potential host plants occur in a large region encompassing parts of Venezuela, northern Brazil and southeast Colombia. This entire region is very under-sampled, being very remote and completely unsurveyed. In total approximately 0.002% of its potential suitable habitat has been surveyed for fungi. It is not possible to estimate population size or trends, EOO, or AOO. Increasing threats from timber and mineral extraction, and land use changes are anticipated, with the potential for these to be rapid if further road construction occurs. It is therefore assessed as Data Deficient, and further survey work in this region is urgently needed.


Taxonomic notes

At present classified within its own genus, but this may change when the phylogeny of the family stabilizes (Henkel et al. 2016).


Why suggested for a Global Red List Assessment?

Binderoboletus segoi is a rare, monotypic genus endemic to the Guiana Shield region of northern South America where it is known from two locations in Guyana. Only a tiny fraction of its possible suitable habitat has been surveyed. Potential host plants occur in a large region encompassing parts of Venezuela, northern Brazil and southeast Colombia. This entire region is very under-sampled, being very remote and completely unsurveyed. In total approximately 0.002% of its potential suitable habitat has been surveyed for fungi. It is not possible to estimate population size or trends, EOO, or AOO. Increasing threats from timber and mineral extraction, and land use changes are anticipated, with the potential for these to be rapid if further road construction occurs. It is therefore assessed as Data Deficient, and further survey work in this region is urgently needed.


Geographic range

Its currently known distribution is restricted to Dicymbe-dominated forests in the Guiana Shield region where it is known from eight collections at two sites: Site 1: Pakaraima Mountains, Upper Potaro River Basin, within 5 km radius of Potaro base camp at 5.30133333, -59.91111111, 710-750 m; 3.5 km southwest of Potaro base camp near Dicymbe plot 3; vicinity of base camp; 4 km upstream from Ayanganna airstrip; 4 km southwest of base camp near Dicymbe plot 3;  1 km west of base camp under D. corymbosa; 0.5 km south of base camp at Blackwater Point; 15 km east of Potaro base camp near Tadang base camp in mixed D. corymbosa-D. altsonii-A. insignis forest; vicinity of Tadang base camp; Site 2: Mabura Ecological Reserve, field station at 5.1527778, -58.69972222, ~100 m; ,~4 km northwest of Mabura field station in D. altsonii monodominant plot 3.

This entire region is very under-sampled, and there are areas in neighbouring Venezuela, northern Brazil and southeast Colombia with similar habitats but which are very remote and completely unsurveyed.


Population and Trends

It is presently known only from eight collections, representing 8 genets (at least 16 ramets). Henkel et al. (2012) reported a 1% incidence of the species over a 7 y plot survey. It appears sporadically and was recorded every 3-4 yrs during surveys from 2001-2011. This three hectare study site is the only site surveyed for fungi out of a very large area (approximately 500,000 km2) where Dicymbe occurs in north tropical South America. It is therefore impossible to estimate its population size or trends with any degree of confidence.

Population Trend: Uncertain


Habitat and Ecology

Solitary to scattered on humic mat of the forest floor in monodominant Dicymbe corymbosa stands or mixed D. corymbosa, D. altsonii and Aldina insignis stands on lateritic soils; also found in D. altsonii monodominant stands on white-sand soils; known from the type locality in Guyana’s Upper Potaro River Basin and 100 km to the east in the Upper Demerara River Basin. Recorded in the months of May, June, July, and December.

Subtropical/Tropical Moist Lowland Forest

Threats

Current threats include climate change and small-scale mineral extraction that can cause habitat disturbance and water pollution although these threats are currently not thought to be severe as much of the interior of the region is very remote. Future threats from timber and mineral extraction, and land use changes are anticipated, with the potential for these to be rapid if further road construction occurs. Further impacts of climate change, particularly droughts, are also anticipated.

Seepage from miningHabitat shifting & alterationDroughts

Conservation Actions

No conservation actions are currently in place for this species. Protection of habitat is needed.

Resource & habitat protection

Research needed

Additional survey work to document the species’ distribution and abundance, taxonomy, and life history are needed.

TaxonomyPopulation size, distribution & trendsLife history & ecology

Use and Trade

There are no known uses of this species.


Bibliography


Known distribution - countries

Regional Population and Trends

Country Trend Redlisted