Trembling Phlebia

(Phlebia tremellosa)

Conservation Status
Trembling Phlebia
Photo by Luciearl
  IUCN Red List

not listed


not listed


not listed


Trembling Phlebia is a wood-rotting fungus. It is found in Europe, Asia, and North and Central America. In the united States it is common from the East Coast to the Midwest and on the West Coast. It is less common in Minnesota, where it is at the western edge of its range. It obtains its nutrients from dead wood (saprobic). It grows flat (resupinate), alone or in groups, mostly on stumps and fallen branches of deciduous trees, especially oak and beech, occasionally also on wood of coniferous trees. It sometimes appears in overlapping clusters.

The fruiting body is a 2 to 4 long, ¾ to 1½ wide, irregularly shaped patch of pore surface spread out flat (effused) on a branch or log (substrate). It is pale and lies completely flat (resupinate) when young. As it matures it darkens and the upper edge folds back more than 90° creating a bracket-like cap. Adjacent patches often fuse together covering extensive areas.

The lower surface is the only visible part when no caps are present. It is yellowish to brownish-orange to pinkish-orange when young, becoming orange to red when mature. The flesh is translucent, flexible, rubbery, and somewhat jelly-like. It has a shallow, elaborate network of narrow ridges, 1 32 to 1 16 wide furrows, and crossveins. It looks something like a tube surfacebut unlike a true tube surface, spore-producing structures (basidia) cover the entire networked layer.

The caps, when present, are narrow, up to ¾ long, white to pale yellow, and densely covered with woolly hairs. There is no stem.

The flesh is very thin, whitish, and waxy or gelatinous. It is not edible.

The spore print is white.


Similar Species


Wrinkled Crust (Phlebia radiata) does not produce caps.

Habitat and Hosts

Mostly hardwoods, especially oak and beech




Late spring through fall


Distribution Map



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




Widespread and common

  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 Meruliaceae  
  Genus Phlebia  

This species was formerly classified as Merulius tremellosus. In 1984 it was transferred to the genus Phlebia. A recent DNA study (Monclavo et al., 2002) showed the the genus Phlebia is probably polyphyletic, containing unrelated species. However, Phlebia tremellosa is part of a group that clearly belongs to the genus Phlebia.




Merulius imbricatus

Merulius spongiosus

Merulius tremellosus

Sesia tremellosa

Xylomyzon tremellosum


Common Names


Jelly Rot

Trembling Merulius

Trembling Phlebia











A microscopic, club-shaped structure on the underside of the cap of club fungi that produces spores. Plural: basidia.



In fungi: referring to the fruiting body lying flat on the surface of the substrate, without a stalk or a cap.



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

Visitor Photos

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    Trembling Phlebia      

Found a lot of this fungus on several downed trees.

    Trembling Phlebia      

Fairview Twp., Cass County

    Trembling Phlebia   Trembling Phlebia  

I believe these were all on a large downed poplar.

    Trembling Phlebia   Trembling Phlebia  
    Trembling Phlebia   Trembling Phlebia  
    Trembling Phlebia      








Visitor Videos

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Other Videos
  Żylak trzęsakowaty (Phlebia tremellosa) Jaworzno
Paul and Mushrooms

Published on Nov 1, 2017

  Jelly Rot Fungus - Trembling Merulius - Rotsveppir - Geislahrúður - Sveppir
Hellen Linda Drake

Published on Feb 21, 2014

Jelly Rot Fungus - Phlebia tremellosa - Merulius tremellosus. - Meruliaceae - Kniplingsætt - Sveppaætt - Phlebia radiate - Geislahrúður

Phlebia means "veins"; tremellosa means "trembling."

Its typical form is a classic example of what mycologists call an "effused-reflexed" fruiting body; it spreads its spore-bearing surface over the wood and musters up just enough cap-making umph to fold over its upper edge into a slight extension. Other distinguishing features include the translucent, orangish to pinkish spore-bearing surface, which develops deep folds and pockets; the whitish, hairy upper edge; growing alone to gregariously, sometimes in overlapping clusters; found primarily on the dead wood of hardwoods but also reported on conifer wood; causing a white rot; See more:

Upper surface: Caps white to pale yellow; hairy, wooly. Pore surface: Pore-like with a network of radiating folds, ridges, and crossveins; yellowish to brownish-orange to pinkish-orange; rubbery, flexible, and gelatinous. Edibility: Inedible. :

Caps white to pale yellow; hairy, woolly. These soft and flexible bracket-like growths often fuse laterally to form more extensive sheets. Habitat : Mostly on decaying deciduous wood. Fairly frequent and widespread in Britain. See more:

Hérna er að finna mikinn fróðleik um alskonar sveppi eins og rotsveppi af Kniplingsætt (Meruliaceae) :

Fungi, Basidiomycota, Agaricomycotina, Agaricomycetes, Polyporales, Meruliaceae, Phlebia.




Visitor Sightings

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Location: Fairview Twp, Cass County

Trembling Phlebia  
  Apricity Apricity
Fall 2021

Location: Martin County, Fairmont, MN


Location: Fairview Twp, Cass County

Found a lot of this fungus on several downed trees.

Trembling Phlebia  

Location: Fairview Twp., Cass County

Trembling Phlebia  

Location: Cass County

Trembling Phlebia  






Created: 10/28/2018

Last Updated:

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