Star Rosette Lichen

(Physcia stellaris)

               
Conservation Status

IUCN Red List

not listed

Star Rosette Lichen

NatureServe

NNR - Unranked

Minnesota

not listed

Occurrence

Widespread and very common

Habitat/Hosts

Elm, poplar, and alder

    Photo by Luciearl
 
Identification

Star Rosette Lichen is widespread and common across the United States. It is very common in Minnesota, and has been recorded in 75 of the state’s 87 counties. It grows on the bark of elm and poplar trees and alder shrubs.

The vegetative body (thallus) is leaf-like (foliose), up to 1½ in diameter, and divided into lobes. It sometimes merges with adjacent thalli, creating what appears to be one large thallus. It is attached to the substrate (bark) by pale anchoring structures (rhizines). The lobes are truncate at the tip can be 1 64 to 1 16 (0.5 to 1.5 mm) wide, but are usually no more than 1 64 (0.5 mm) wide. The upperside is whitish-gray to cream-colored, usually darker in the center and paler at the margins. The surface has neither powdery dull granules (soredia) nor shiny granules (isidia). The underside is white to brownish.

Disk-like, spore-producing structures (apothecia) are usually abundant. The disks are 1 64to in diameter, dark brown, and shaped like a plate. Each disk has a thick ring of tissue around it that resembles the tissue of the vegetative (non-fruiting) part of the lichen. The disks turn gray when dry.

 
Similar
Species

 

 
Distribution Distribution Map  

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

 
Comments

 

 
Taxonomy

Division:

Ascomycota (sac fungi)

 

No Rank:

saccharomyceta

 

Subdivision:

Pezizomycotina

 

No Rank:

leotiomyceta

 

Class:

Lecanoromycetes

 

Subclass:

Lecanoromycetidae

 

Order:

Teloschistales

 

Family:

Physciaceae

 

Mycobiont:

Physcia stellaris

 

Photobiont:

 

 
Synonyms

 

 
Common
Names

Immaculate Rosette Lichen

Star Rosette 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. Plural: thalli.

       
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Alfredo Colon
       
  Star Rosette Lichen    
       
Luciearl
       
  Star Rosette Lichen   Star Rosette Lichen
       
  Star Rosette Lichen    
       
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Alfredo Colon
8/15/2019

Location: Woodbury, Minnesota

Star Rosette Lichen


Luciearl
1/7/2019

Location: Minneral Springs Park, Owatonna, MN

Star Rosette Lichen


Luciearl
10/14/2018

Location: Cass County

Star Rosette Lichen


     
     
 
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Created: 10/25/2018

Last Updated:

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