Powder-edged Speckled Greenshield

(Flavopunctelia soredica)

Conservation Status
Xxxxxxxxxx
Photo by Luciearl
  IUCN Red List

not listed

 
  NatureServe

NNR - Unranked

 
  Minnesota

not listed

 
           
           
           
           
 
Description
 
 

Powder-edged Speckled Greenshield Is a medium-sized, common, and very widespread lichen. It occurs in Europe, Asia, Africa, and North and South America. It occurs across the United States, throughout Mexico, and in southern Canada. It is very common in Minnesota. It grown on the bark and wood of both hardwoods, including maple, New Jersey tea, ash, walnut, cherry, oak, sumac, locust, and willow; and on conifers, including balsam fir, eastern redcedar, spruce, pine, and Douglas fir. It very rarely grows on rock.

The vegetative body (thallus) is up to 4¾ in diameter, leaf-like (foliose), and divided into lobes. It may be closely pressing against the surface (appressed), or growing with the bark so that it can't be removed with a knife without fragmenting (adnate). It is attached to the substrate (bark or wood) by numerous tufted anchoring structures (rhizines). The rhizines are short, unbranched, and the same color as the lower surface of the thallus. They are dense toward the center and usually absent near the margins. The lobes are narrow, irregular, flat, and to 5 16 wide. Adjacent lobes touch but are not fused together. The upper surface is smooth or slightly wrinkled, pale green or yellowish-green to greenish-yellow, and frequently has white blotches. The underside is black to dark chestnut brown, except near the edges, which is sometimes pale brown. The margins are crescent-shaped and are densely covered with white reproductive granules (soredia), giving them a powdered look. This is the feature that gives the lichen its common name. The upper side does not have soredia.

Spore-producing structures (apothecia) are rarely produced. When present, they are dark brown, saucer-shaped, deeply concave, and 1 16 to ¼ (2 to 6 mm) in diameter.

 
     
 

Similar Species

 
  Speckled Greenshield (Flavopunctelia flaventior) lobes are usually broader.  
     
 
Biology
 
 

Substrate

 
 

Trees

 
     
 

Growth Form

 
 

Foliose

 
     
 

Habitat

 
 

 

 
     
 

Hosts

 
 

Hardwoods, including maple, New Jersey tea, ash, walnut, cherry, oak, sumac, locust, and willow; and conifers, including balsam fir, eastern redcedar, spruce, pine, and Douglas fir.

 
     
 
Distribution
 
 

Distribution Map

 

Sources

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

 
  5/30/2022      
         
 

Occurrence

 
 

Very widespread and very common

 
         
 
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

Flavopunctelia (speckled greenshield lichens)  
  Mycobiont Flavopunctelia soredica  
  Photobiont    
       
 

Synonyms

 
 

 

 
       
 

Common Names

 
 

Powder-edged Speckled Greenshield

 

 

 

 

 

 

 

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.

 

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

 
    Powder-edged Speckled Greenshield      
           
 
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  Luciearl
8/28/2019

Location: Cass County

Powder-edged Speckled Greenshield  
           
 
MinnesotaSeasons.com Sightings
 
 

 

 

 

 

Binoculars


Created: 9/26/2019

Last Updated:

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