The Thelotremataceae comprise a very large family of crustose lichens that has attracted the attention of many lichenologists, beginning with
Acharius (Hale, 1972). They have unique craterlike apothecia, but this characteristic feature can usually only be seen under magnification. As a
matter oi fact, these inconspicuous lichens will oEten be overlooked in the field unless a hand lens is used. Furthermore, because of the small
size of the apothecia, very few species can be recognized at sight. All must be collected and examined later for morphological and chemical
characters. Thallus color, however, is rather constant, light greenish or ashy gray. Only a few species have the deep green color of the equally common pyrenocarpous lichens, which, together with the Graphidaceae and Thelotremataceae, account for the majority of crusts that are collected in lowland tropical regions.

Mason E. Hale, Jr.
Morden - Smithsonian Expedition to Dominica: The Lichens (Thelotremataceae)
1974

When family matters: An analysis of Thelotremataceae (Lichenized Ascomycota: Ostropales) as bioindicators of ecological continuity in tropical rainforests

The lichen family Gomphillaceae (Ascomycota: Ostropales) in eastern North America, with notes on hyphophore development in Gomphillus and Gyalideopsis

A first assessment of the Ticolichen biodiversity inventory in Costa Rica: the genus Coenogonium (Ostropales: Coenogoniaceae), with a world-wide key and checklist and a phenotype-based cladistic analysis