Peltigera aphthosa

Peltigera aphthosa is a species of lichen known by the common names green dog lichen, leafy lichen, felt lichen, and common freckle pelt. It has a circumpolar distribution, occurring throughout the Arctic, boreal, and temperate regions of the Northern Hemisphere.[1]

Peltigera aphthosa

Secure (NatureServe)
Scientific classification edit
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Order: Peltigerales
Family: Peltigeraceae
Genus: Peltigera
P. aphthosa
Binomial name
Peltigera aphthosa
(L.) Willd. (1787)
  • Lichen aphthosus L. (1753)

This lichen has a large thallus that may exceed one meter in width. It is divided into lobes up to about 10 centimeters long and 6 wide. It is green, becoming pale as it dries. The thallus is dotted with cephalodia, which contains one of the two symbionts, a species of Nostoc. The other is a species of Coccomyxa. These perform photosynthesis, and the Nostoc also fixes nitrogen. The lichen produces large apothecia, a reproductive structure.[1]

This widespread lichen grows in a variety of habitat types, including Arctic ecosystems. It grows in alpine climates in the southern parts of its distribution.[1]

This lichen was noted to absorb aluminum and silicon from the ash released from the 1980 eruption of Mount St. Helens.[1]

It is a known host to the lichenicolous fungus species Lichenopeltella santessonii.[2]


  1. ^ a b c d Matthews, Robin F. 1993. Peltigera aphthosa. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory.
  2. ^ Brackel, Wolfgang von (2011). "Lichenopeltella rangiferinae sp. nov. and some other lichenicolous fungi from Iceland" (PDF). Acta Botanica Islandica. 15: 51–60.

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