Field Dog Lichen

(Peltigera rufescens)

               
Conservation Status

IUCN Red List

not yet assessed

Field Dog Lichen

NatureServe

not listed

Minnesota

not listed

Occurrence

Widespread and common

Season

 

Habitat/Hosts

Fields, roadsides, hiking trails. Full or partial sun. Sandy soil.

Growth Form

Foliose

 
 
Identification

This lichen grows on the ground in full sun in fields and sandy areas.

The vegetative bodies (thallus) are leaf-like (foliose) with broad, upturned lobes. They look like dog’s ears, giving the lichen its common name. They are attached to the soil at occasional points by tufted or fibrous, anchoring structures (rhizines). The upper surface is dark brownish-gray at the base, fading to bluish-gray then ash-gray at the margins, and densely covered with minute, felty hairs. The undersurface is brownish and densely covered with white hairs. The margins are wavy or crinkled.

The rhizines are white near the margins of the lobes and dark brown away from the margins.

 
Similar
Species

Alternating Dog Lichen (Peltigera didactyla) thallus upper surface has round, pale, blue-gray, granular patches. All of the rhizines are whitish.

Dog Lichen (Peltigera caninna) has larger, to 1 wide lobes.

 
Distribution Distribution Map  

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

 
Comments

 

 
Taxonomy

Division:

Ascomycota (sac fungi)

 

No Rank:

saccharomyceta

 

Subdivision:

Pezizomycotina

 

No Rank:

leotiomyceta

 

Class:

Lecanoromycetes

 

Subclass:

Lecanoromycetidae

 

Order:

Peltigerales (lichens)

 

Suborder:

Peltigerineae

 

Family:

Peltigeraceae (felt, pore lichens)

 

Mycobiont:

Peltigera rufescens

 

Photobiont:

Nostoc

 
Synonyms

 

 
Common
Names

Felt Lichen

Field Dog Lichen

Field Dog-lichen

 

 

 

 

 

 

Glossary

Apothecia

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.

 

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.

 

Mycobiont

The fungal partner of a lichen.

 

Photobiont

The photosynthetic partner of a lichen; either green algae or cyanobacteria.

 

Rhizine

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

 

Thallus

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

       
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