''Tylopilus potamogeton'' is a bolete fungus in the family Boletaceae. It was described as new to science in 1978 by mycologist

Rolf Singer Rolf Singer (June 23, 1906 – January 18, 1994) was a Germany, German-born mycologist and one of the most important Taxonomy (biology), taxonomists of gilled mushrooms (agarics) in the 20th century. After receiving his Ph.D. at the University ...

from collections made near

Ponta Negra Ponta Negra (Portuguese: ''Black Tip'') is a beach and neighborhood located in the Brazilian city of Natal, the capital of the state of Rio Grande do Norte. Located in the extreme south of the beach is the Morro do Careca (Portuguese: ''Bald Man ...

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

, where it was found growing on sandy soil near dicotyledonous trees. Fruiting occurs in the

rainy season The rainy season is the time of year when most of a region's average annual rainfall occurs. Rainy Season may also refer to: * ''Rainy Season'' (short story), a 1989 short horror story by Stephen King * "Rainy Season", a 2018 song by Monni * ''T ...

, from December to early March. The characteristic microscopic feature of this species is the unusually wide

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 spindle-shaped spores, which measure 9.5–12 by 6.5–8

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 ...

. Singer considered this feature, along with the bitter taste and stipe covering, to warrant creating a new section to contain it, which he named ''Potamogetones''.

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potamogeton ''Potamogeton'' is a genus of aquatic, mostly freshwater, plants of the family Potamogetonaceae. Most are known by the common name pondweed, although many unrelated plants may be called pondweed, such as Canadian pondweed (''Elodea canadensis'' ...

Fungi described in 1978 Fungi of Brazil Taxa named by Rolf Singer Fungus species {{Boletales-stub