Stereocaulon paschale

Stereocaulon paschale
Scientific classification
Kingdom:	Fungi
Division:	Ascomycota
Class:	Lecanoromycetes
Order:	Lecanorales
Family:	Stereocaulaceae
Genus:	Stereocaulon
Species:	S. paschale
Binomial name
Stereocaulon paschale (L.) Hoffm. (1796)
Synonyms
Lichen paschalisL. (1753)

Stereocaulon paschale is a species of lichen belonging to the family Stereocaulaceae. ^[1]

It has a cosmopolitan distribution. ^[1]

In Iceland, it has the conservation status of a vulnerable species (VU). ^[2]

Ecology

Stereocaulon paschale is host to some lichenicolous fungi which infect various parts of the thallus. Most of these fungi have a Holarctic distribution. These fungi include: ^[3]

• Arthonia stereocaulina , Infects the phyllocladia but rarely causes disease.
• Catillaria stereocaulorum , Mainly infects the phyllocladia, which can become swollen and dark. It is common in the Arctic.
• Cercidospora stereocaulorum , Infects phyllocladia and sometimes on stems, cephalodia and apothecia.
• Endococcus nanellus , Infects phyllocladia and sometimes on stems, cephalodia and apothecia. Often found in discolored apothecia but does probably not cause the discoloration.
• Lasiosphaeriopsis stereocaulicola , Usually found at the stem base which can turn brown but no other symptoms are known.
• Lichenopeltella stereocaulorum , Most often found on stems. This species was only discovered in 2010.
• Opegrapha stereocaulicola , Infects stems which may become darker.
• Phaeosporobolus alpinus , Commensal. Most commonly found on species of Pertusaria or Ochrolechia .
• Polycoccum trypethelioides , Produces galls on stem which change colour with time turning cinnamon colour or brown.

References

1. "Stereocaulon paschale (L.) Hoffm". www.gbif.org. Retrieved 12 February 2021.
2. Náttúrufræðistofnun Íslands [Icelandic Institute of Natural History] (1996). Válisti 1: Plöntur. (in Icelandic) Reykjavík: Náttúrufræðistofnun Íslands.
3. Zhurbenko, Mikhail P. (2010). "Lichenicolous fungi and lichens growing on Stereocaulon from the Holarctic, with a key to the known species" (PDF). Opuscula Philolichenum. 8: 9–39.