Placynthium

Placynthium is a genus of lichen-forming fungi in the family Placynthiaceae.^[1] Members of this genus are commonly called blackthread lichens.^[2][3]

Placynthium
Placynthium nigrum
Scientific classification
Kingdom:	Fungi
Division:	Ascomycota
Class:	Lecanoromycetes
Order:	Peltigerales
Family:	Placynthiaceae
Genus:	Placynthium (Ach.) Gray (1821)
Type species
Placynthium nigrum (Huds.) Gray (1821)
Synonyms
Collema † Placynthium Ach. (1810)

Species

• Placynthium anemoideum (Servít) Gyeln. (1938)
• Placynthium asperellum (Ach.) Trevis. (1869)
• Placynthium australiense P.M.McCarthy & Kantvilas (2014)
• Placynthium caesium (Ach.) Vain. (1909)
• Placynthium filiforme (Garov.) M.Choisy (1951)
• Placynthium flabellosum (Tuck.) Zahlbr. (1925)
• Placynthium garovaglii (A.Massal.) Malme (1918)
• Placynthium glaciale Fryday & T.Sprib. (2020)^[4]
• Placynthium hungaricum Gyeln. (1939)
• Placynthium lismorense (Cromb.) Vain. (1909)
• Placynthium majus Harm. (1913)
• Placynthium nigrum (Huds.) Gray (1821)
• Placynthium pannariellum (Nyl.) H.Magn. (1936)
• Placynthium petersii (Nyl.) Burnham (1922)
• Placynthium pluriseptatum (Arnold) Arnold (1889)
• Placynthium posterulum (Nyl.) Henssen (2007)
• Placynthium pulvinatum Øvstedal (2009)
• Placynthium subradiatum (Nyl.) Arnold (1884)
• Placynthium tantaleum (Hepp) Hue (1906)
• Placynthium tremniacum (A.Massal.) Jatta (1900)