''Tylopilus orsonianus'' is a bolete fungus of the genus '' Tylopilus''. It is 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 ...

, where it fruits singly to scattered on root mats of forests dominated by the tree ''

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 ...

''. It was first described scientifically in 2007 by Tara Fulgenzi and Terry Henkel. The species epithet honors American mycologist Orson K. Miller, Jr.

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 ...

of the fungus have velvety brown convex to flattened caps typically measuring in diameter. The spore print is flesh pink; the smooth spores are

ellipsoid An ellipsoid is a surface that may be obtained from a sphere by deforming it by means of directional scalings, or more generally, of an affine transformation. An ellipsoid is a quadric surface; that is, a surface that may be defined as the ...

to somewhat fuse-shaped (subfusoid), inamyloid, and have dimensions of 11–14.5 by 4.9–7.4

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 ...

References

External links

* orsonianus Fungi described in 2007 Fungi of Guyana Fungus species {{Boletales-stub