Mossy Maze Polypore

(Cerrena unicolor)

Conservation Status
Mossy Maze Polypore
Photo by Luciearl
  IUCN Red List

not listed

     
  NatureServe

NNR - Unranked

     
  Minnesota

not listed

     
           
           
           
           
 
Description
 
 

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

 
     
 
Ecology
 
 

Season

 
 

Year round

 
     
 
Distribution
 
 

Distribution Map

 

Sources

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

 
  5/3/2021      
         
 

Occurrence

 
 

Widespread and very common

In Minnesota it is very common in the eastern half of the state, uncommon to absent in the western half.

 
         
 
Taxonomy
 
  Kingdom Fungi (fungi)  
  Subkingdom Dikarya  
  Division Basidiomycota (club fungi)  
  Subdivision Agaricomycotina (jelly fungi, yeasts, and mushrooms)  
  Class Agaricomycetes (mushroom-forming fungi)  
  Subclass Agaricomycetidae  
  Order Polyporales (shelf fungi)  
  Family Cerrenaceae  
  Genus Cerrena  
       
 

Synonyms

 
 

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.

 
       

 

 

 

 

 

 

Glossary

Polypore

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

 

Saprobic

Obtaining its nutrients from non-living organic matter, such as decaying plant or animal matter.

 
 
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Luciearl

 
    Mossy Maze Polypore   Mossy Maze Polypore  
           
           
 
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Cerrena unicolor
Mushrooms Fungi
   
 
About

Aug 28, 2020

https://en.wikipedia.org/wiki/Cerrena_unicolor

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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  Luciearl
12/8/2018

Location: Cass County

Mossy Maze Polypore

 
           
           
 
MinnesotaSeasons.com Sightings
 
 

 

 

 

 

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Created: 5/3/2021

Last Updated:

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