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Polymeridium quinqueseptatum (Nyl.) R.C. Harris
White pyrenolichen
Federal Protection: No US federal protection
State Protection: No Georgia state protection
Global Rank: GNR
State Rank: SNR
Element Locations Tracked in Biotics: No
SWAP 2015 Species of Greatest Conservation Need (SGCN): No
SWAP 2025 Species of Greatest Conservation Need (SGCN): No
2025 SGCN Priority Tier: None
Element Occurrences (EOs) in Georgia: 0
Habitat Summary for element in Georgia: Mesic hardwood forests and swamps
White crust with solitary black perithecia, thallus not corticate; MICROSCOPY: spores colorless, about 6-8-celled, constricted at septa, about 22.5 x 5.5 µm; CHEMISTRY: thallus UV-; FIELD ID: requires dissection to observe spore characteristics
Strigula stigmatella also has 8-celled spores, but cells are straight-sided, not bulbous (not constricted at septa)
None
Mesic hardwood forests & swamps; substrates: mostly hardwood bark, about half on Ilex spp.; 2 records on Taxodium
Mesic hardwood forests & swamps; substrates: mostly hardwood bark, about half on Ilex spp.; 2 records on Taxodium
None
Coastal Plain
Unknown
Rare to occasional
None
Brodo, I. M. 2001. Lichens of North America. Yale University Press, New Haven, Conn.
Brodo, I. M. 2016. Keys to lichens of North America: revised and expanded. Yale University Press, New Haven, Conn.
Esslinger, T. L. 2021. A cumulative checklist for the lichen-forming, lichenicolous and allied fungi of the continental United States and Canada. Version 24. Opuscula Philolichenum 20: 100-394.
Harris, R. C. 1995. More Florida lichens including the 10-cent tour of the pyrenolichens. Unpublished manuscript, Bronx, N.Y.
Ingle, K. K., S. Trivedi, S. Nayaka & D. K. Upreti. 2017. The lichen genera Dictyomeridium and Polymeridium (Trypetheliales: Trypetheliaceae) in India. Taiwania 62: 50-54.
Malcolm Hodges
4 August 2022
