Mossy Maze Polypore

(Cerrena unicolor)

Conservation Status
Mossy Maze Polypore
Photo by Luciearl
  IUCN Red List

not listed


NNR - Unranked


not listed


Mossy Maze Polypore is a widespread and very common bracket fungi (polypore). It occurs in Europe and Asia, and throughout North and Central America. In the United States it is common east of the Great Plains, uncommon in the Pacific northwest, and absent elsewhere. In Minnesota it is very common in the eastern half of the state, uncommon to absent in the western half. It is found year round in deciduous and mixed forests. It grows in overlapping clusters on dead hardwood stumps and logs. It is saprobic, obtaining its nutrients from rotting wood. It causes white rot in wood.

When growing on the underside of a log it looks like a pore surface that has lost its cap. When on the top or side of a log or stump it produces a semi-circular, kidney-shaped to fan-shaped, shelf-like or bracket-like cap. The cap is 1¼ to 4 (3 to 10 cm) wide. It is attached to the substrate without a stalk. The upper surface is whitish to brownish or dark brown, but is often green due to a covering of algae. It is concentrically zoned and has a broad pale margin. It is densely covered with fine hairs, sometimes velvety. It is smooth at first, becoming wrinkled or bumpy with age.

The pore surface is whitish when young, becoming smoky gray at maturity. The pores are slotted, maze-like. The tubes are up to (4 mm) deep. They often break into teeth as they age.

When sliced, there is a thin dark line just beneath the upper surface. The flesh is whitish, leathery, and tough. It is inedible.

The sport print is white.


Similar Species


Thin-Walled Maze Polypore (Daedaleopsis confragosa) upper surface is hairless or slightly hairy. The pore walls are relatively thin and white to tan or brown.

Habitat and Hosts

Dead hardwood stumps and logs in deciduous and mixed forests




Year round


Distribution Map



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




Widespread and very common

  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 Cerrenaceae  
  Genus Cerrena  



Boletus unicolor

Daedalea cinerea

Trametes unicolor


Common Names


Mossy Maze Polypore


The common name is a misnomer. The cap is often covered with green algae, rarely with moss.











A bracket fungi. A fungi that produces its spores in pores on the underside of a woody fruiting body (conk).



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

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    Mossy Maze Polypore   Mossy Maze Polypore  





Cerrena unicolor
Mushrooms Fungi

Aug 28, 2020

Cerrena unicolor (Bull.) Murrill
Family: Polyporaceae

World: Mossy maze polypore (Eng.), Tramète à ligne noire (Fr.), Aschgrauer Wirrling, Einfarbige Tramete (De.), Церрена одноцветная (Ru.).

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Location: Cass County

Mossy Maze Polypore







Created: 5/3/2021

Last Updated:

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