''Tylopilus rufonigricans'' is a
bolete fungus in the family
Boletaceae found in the
Pakaraima Mountains of
Guyana
Guyana ( or ), officially the Cooperative Republic of Guyana, is a country on the northern mainland of South America. Guyana is an indigenous word which means "Land of Many Waters". The capital city is Georgetown. Guyana is bordered by the ...
. It was
described as new to science in 1999 by mycologist Terry Henkel. Its
fruit bodies
The sporocarp (also known as fruiting body, fruit body or fruitbody) of fungi is a multicellular structure on which spore-producing structures, such as basidia or asci, are borne. The fruitbody is part of the sexual phase of a fungal life cyc ...
have convex to flattened
caps measuring in diameter; caps can form a central depression in age. The cap surface is covered with black scales, while the surface between the scales is initially greenish yellow, and later dull green and eventually greyish black. The
flesh turns reddish when it is cut or injured. Tubes on the cap underside are 5–7.5 mm long, and there are 2–3 pores per mm. The
stipe measures long by 10–20 mm thick. The
spore print is cinnamon brown;
spores are smooth and roughly spindle-shaped (subfusiform) with dimensions of 12–15.2 by 3.6–4.8
μm
The micrometre ( international spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is a unit of length in the International System of Unit ...
. ''T. exiguus'' fruits singly on root mats on trunks of ''
Dicymbe corymbosa
''Dicymbe'' is a genus of 20 species of canopy trees in the family Fabaceae, within subfamily Detarioideae. It is found throughout the Guyana Shield region and parts of W Amazonia. Certain species within the genus are strongly associated with e ...
''. The
specific epithet
In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...
''rufonigricans'' refers to the reddening reaction of the flesh upon injury.
References
External links
*
rufonigricans
Fungi described in 1999
Fungi of Guyana
Fungus species
{{Boletales-stub