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Thelotrema monospermum R.C. Harris
Whale-spore Bark-barnacles
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: Swamps, mesic hardwood forests
Pale green thallus, corticate; apothecia 0.2-0.5 mm in diameter, immersed in pores, thallus around pores usually raised, either conical or mounded, sometimes nearly flat; exciple usually free & visible as a thin, irregular membrane within each pore; disks gray- to white-pruinose; MICROSCOPY: spores brown, densely muriform, >100 µm long, 1/ascus; FIELD ID: dissection required
Thelotrema lathraeum is also corticate but all its pores are tiny, 0.2-0.35 mm across; T. subtile has similar sized pores, but its thallus is ecorticate & flat (not raised) around the pores; both those species have relatively small, colorless, transversely septate spores
None
Swamps, mesic hardwood forests, on hardwood bark: 3 records on Nyssa, 1 each on Liquidambar, Liriodendron, Magnolia & Quercus
Corticolous crustose lichenized fungus, photobiont an alga in Trentepohlia
None
Coastal Plain
Unknown
Rare
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 Unpublished manuscript, Bronx, N.Y.
Malcolm Hodges
1 August 2022
