Star Rosette Lichen

(Physcia stellaris)

Conservation Status
Star Rosette Lichen
Photo by Luciearl
  IUCN Red List

not listed

 
  NatureServe

NNR - Unranked

 
  Minnesota

not listed

 
           
           
 
Description
 
 

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

 
     
     
 
Biology
 
 

Substrate

 
 

Trees

 
     
 

Growth Form

 
 

Foliose

 
     
 

Habitat

 
 

 

 
     
 

Hosts

 
 

Elm, poplar, and alder

 
     
 
Distribution
 
 

Distribution Map

 

Sources

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

 
  5/30/2022      
         
 

Occurrence

 
 

Widespread and very common

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

Order

Caliciales  
 

Family

Physciaceae  
 

Genus

Physcia (rosette lichens)  
  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.

 
 
Visitor Photos
 
           
 

Share your photo of this fungus.

 
  This button not working for you?
Simply email us at info@MinnesotaSeasons.com.
Attach one or more photos and, if you like, a caption.
 
 

Alfredo Colon

 
    Star Rosette Lichen      
 

Luciearl

 
    Star Rosette Lichen   Star Rosette Lichen  
           
    Star Rosette Lichen      
           
 
MinnesotaSeasons.com Photos
 
 

 

 
           

 

Camera

     
 
Slideshows
 
 
     
     

 

slideshow

       
 
Visitor Videos
 
       
 

Share your video of this fungus.

 
  This button not working for you?
Simply email us at info@MinnesotaSeasons.com.
Attach a video, a YouTube link, or a cloud storage link.
 
 

 

 
     
     
       
       
 
Other Videos
 
     
     
     

 

Camcorder

 
 
Visitor Sightings
 
           
 

Report a sighting of this fungus.

 
  This button not working for you?
Simply email us at info@MinnesotaSeasons.com.
Be sure to include a location.
 
  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  
           
 
MinnesotaSeasons.com Sightings
 
   

 

 

Binoculars


Created: 10/25/2018

Last Updated:

About Us | Privacy Policy | Contact Us | © 2022 MinnesotaSeasons.com. All rights reserved.