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Fissurina insidiosa C. Knight & Mitten
Treacherous Script
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:
Element Occurrences (EOs) in Georgia: 0
Habitat Summary for element in Georgia: Mesic hardwood forests and swamps
Green-gray to brown thallus thick, glossy, variably verrucose; lirellae short or long, branched, usually closed, with prominent labia; lirellae sometimes green, sometimes contrastingly light brown on green thallus; MICROSCOPY: spores 4-celled, about 18 x 9 µm, not reacting to iodine; CHEMISTRY: no reactions to spot tests; FIELD ID possible with experience & close examination of corticate thallus & puffy, usually closed lirellae
Fissurina ilicicola is paler, ecorticate & rare; it has muriform spores that turn blue-purple in iodine; F. scolecitis is a similar color but has flat lirellae without puffy labia
None
Mesic hardwood forests & swamps; substrates: 24% Ilex bark, 18% Fagus, 13% Magnolia, 13% Quercus, 9% Nyssa, 6% Acer, 6% Fraxinus, & 9% other hardwoods; 1 record from Taxodium
Corticolous crustose lichenized fungus, photobiont a species of alga in genus Trentepohlia
None
Statewide
Unknown
Fairly common, less so in Piedmont
None
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.
Lendemer, J. C. & R. C. Harris. 2014. Seven new species of Graphidaceae (Lichenized Ascomycetes) from the Coastal Plain of southeastern North America. Phytotaxa 189: 153-175.
Malcolm Hodges
29 July 2022