Green Cheese Polypore

(Niveoporofomes spraguei)

Conservation Status
Green Cheese Polypore
Photo by Honey Fae (Farah)
  IUCN Red List

not listed


NNR - Unranked


not listed


Green Cheese Polypore is a common bracket fungus. It occurs in Europe and North America. In the United States it occurs east of the Great Plains and in the Pacific Northwest. It is found from spring through fall alone or in groups but not clustered (gregarious). It grows on both living and dead wood of oaks and other hardwoods. It obtains its nutrients from dead wood (saprobic), and possibly also from living wood (parasitic). It causes a brown cubical rot in wood.

When it first appears, the cap is grayish. The upper surface is irregular and not concentrically zoned. The margin is brownish orange and finely fuzzy, and it bruises grayish green. Water droplets are sometimes exuded on the upper surface, margins, and pore surface. Mature caps are whitish, ¾ to 4 (2 to 10 cm) wide, up to 2 (6 cm) deep, semicircular to almost circular or irregular in outline, and flat or shallowly depressed above. The upper surface is fuzzy and dry.

The pore is surface grayish white. There are 1 to 3 pores per 132 (1 mm). The pores are 116to (2 to 4 mm) long and angular. When young, the pore surface bruises grayish green. When mature it bruises brownish.

There usually is no stalk. When present, the stalk is whitish to brownish, fuzzy, and to ¾ (1 to 2 cm) long and thick.

The flesh of young specimens is soft and leathery with distinct whitish and grayish zones. On mature specimens the flesh is whitish to gray or bluish and tough. It is not edible.


Similar Species

Habitat and Hosts





Spring through fall


Distribution Map



4, 24, 26, 29, 30, 77.





  Kingdom Fungi (fungi)  
  Subkingdom Dikarya  
  Division Basidiomycota (club fungi)  
  Subdivision Agaricomycotina (jelly fungi, yeasts, and mushrooms)  
  Class Agaricomycetes (mushrooms, bracket fungi, puffballs, and allies)  
  Subclass Agaricomycetidae  
  Order Polyporales (shelf fungi)  
  Family Fomitopsidaceae (bracket polypores)  





Fomitopsis spraguei

Pilatoporus spraguei

Polyporus sordidus

Polyporus spraguei

Trametes spraguei

Tyromyces spraguei

Tyromyces subtrimiticus


Common Names


Green Cheese Polypore












Obtaining nutrients from another living organism.



A term often used for saprotrophic fungi. Referring to fungi that obtain their nutrients from decayed organic matter.





Visitor Photos

Share your photo of this fungus.

  This button not working for you?
Simply email us at
Attach one or more photos and, if you like, a caption.

Honey Fae (Farah)

    Green Cheese Polypore      








Visitor Videos

Share your video of this fungus.

  This button not working for you?
Simply email us at
Attach a video, a YouTube link, or a cloud storage link.


Other Videos
  Oozing fungus Niveoporofomes spraguei.
nature is crazy

Jul 28, 2018

found an oozing fungus that oozes clear liquid on a tree stump i beleive this is Niveoporofomes spraguei.

  Green Cheese Polypore, the mushroom that resembles moldy green cheese.
The Rush Room

Sep 2, 2021

Green Cheese Polypore, also called Niveoporofomes spraguei. It is the mushroom that resembles moldy green cheese.




Visitor Sightings

Report a sighting of this fungus.

  This button not working for you?
Simply email us at
Be sure to include a location.
  Honey Fae (Farah)

Location: Dakota County

Green Cheese Polypore  






Created: 2/14/2023

Last Updated:

About Us | Privacy Policy | Contact Us | © All rights reserved.