Smooth Axil-bristle Lichen

(Myelochroa galbina)

Conservation Status
Smooth Axil-bristle Lichen
 
  IUCN Red List

not listed

 
  NatureServe

NNR - Unranked

 
  Minnesota

not listed

 
           
           
           
 
Description
 
 

Smooth Axil-bristle Lichen is a small to medium-sized lichen that grows on the bark of deciduous trees, rarely on rock.

The vegetative body (thallus) is leaf-like (foliose) and divided into lobes. It is attached to the substrate (bark) by abundant, uniformly distributed, black, usually unbranched, anchoring structures (rhizines). The lobes are 1 32 to 1 16 (0.8 to 2 mm) in diameter, flat, and closely appressed to the substrate. The upperside is pale gray to bluish-gray and wrinkled or corrugated in the center. The surface has neither powdery dull granules (soredia) nor shiny granules (isidia). The underside is black. There are short, black, hair-like appendages in the axils of the lobes and sometimes also on the margins. These may not be visible without a hand lens. The interior of the thallus is divided into two layers. The lower layer (medulla) is yellowish, though this may be difficult to see except under the apothecia.

Disk-like, spore-producing structures (apothecia) are usually abundant. The disks are 1 16to 3 16 in diameter, reddish-brown, and shaped like a plate. Each disk has a ring of tissue around it that resembles the tissue of the vegetative (non-fruiting) part of the lichen.

 
     
 

Similar Species

 
 

Powdery Axil-bristle Lichen (Myelochroa aurulenta) has dull, powdery granules (soredia) on the surface that can be easily brushed off.

Rock Axil-bristle Lichen (Myelochroa obsessa) grows only on rocks. The surface is somewhat shiny and is covered with shiny granules (isidia).

 
     
 
Biology
 
 

Substrate

 
 

Trees

 
     
 

Growth Form

 
 

Foliose

 
     
 

Habitat

 
 

Open woods, roadsides.

 
     
 

Hosts

 
 

Hardwood trees.

 
     
 
Distribution
 
 

Distribution Map

 

Sources

4, 7, 24, 26, 29, 30, 77.

 
  5/30/2022      
         
 

Occurrence

 
 

Common in eastern United States and in northern Minnesota

 
         
 
Taxonomy
 
  Kingdom Fungi (fungi)  
  Subkingdom Dikarya  
  Phylum Ascomycota (sac fungi)  
  Subphylum Pezizomycotina  
  Class Lecanoromycetes (common lichens)  
  Subclass Lecanoromycetidae  
 

Order

Lecanorales  
 

Suborder

Lecanorineae  
 

Family

Parmeliaceae (shield lichens and allies)  
  Subfamily Parmelioideae  
 

Genus

Myelochroa  
  Mycobiont Myelochroa galbina  
  Photobiont    
       
 

Synonyms

 
 

Parmelina galbina

 
       
 

Common Names

 
 

Smooth Axil-bristle Lichen

 

 

 

 

 

 

 

Glossary

Apothecium

An open, disk-shaped or cup-shaped, reproductive structure, with spore sacs on the upper surface, that produces spores for the fungal partner of a lichen. Plural: apothecia.

 

Foliose

Adjective: Leaf-like growth form; referring to lichens with leaf-like growths divided into lobes.
Noun: The leaf-like, vegetative body of a lichen (thallus) that has thin, flat lobes which are free from the substrate.

 

Isidium

The reproductive structure of a lichen consisting of a cluster of algal cells (the photobiont) wrapped in fungal filaments (the mycobiont) and enclosed within a layer of protective tissue (cortex). Plural: insidia.

 

Rhizine

A root-like structure of a lichen that attaches the lower layer to the substrate.

 

Soredium

The reproductive structure of a lichen consisting of a cluster of algal cells (the photobiont) wrapped in fungal filaments (the mycobiont). Plural: soredia.

 

Thallus

The vegetative body of a lichen composed of both the alga and the fungus.

 
 
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Luciearl

 
    Smooth Axil-bristle Lichen   Smooth Axil-bristle Lichen  
           
    Smooth Axil-bristle Lichen   Smooth Axil-bristle Lichen  
           
    Smooth Axil-bristle Lichen      
           
 
MinnesotaSeasons.com Photos
 
 

Lichen

 
    Smooth Axil-bristle Lichen      
           
 

Thallus

 
    Smooth Axil-bristle Lichen      
           
 

Apothecia

 
    Smooth Axil-bristle Lichen   Smooth Axil-bristle Lichen  

 

Camera

     
 
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Visitor Sightings
 
           
 

Report a sighting of this fungus.

 
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  Luciearl
1/4/2020

Location: Fairview Twp, Cass County

Smooth Axil-bristle Lichen  
  Luciearl
1/1/2020

Location: Fairview Twp, Cass County

Smooth Axil-bristle Lichen  
  Luciearl
8/29/2018

Location: Cass County

Smooth Axil-bristle Lichen  
           
 
MinnesotaSeasons.com Sightings
 
   

 

 

Binoculars


Created: 9/5/2018

Last Updated:

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