The Graphidaceae are a family of lichen-forming fungi in the order Ostropales. The family contains nearly a hundred genera and more than 2000 species. Although the family has a cosmopolitan distribution, most Graphidaceae species occur in tropical regions, and typically grow on bark.
Ampliotrema is a genus of lichens in the family Graphidaceae. The genus was originally described invalidly in 2004, and validly two years later.
Malmidea is a genus of crustose lichens and the type genus of the family Malmideaceae. It was established in 2011 to contain a phylogenetically distinct group of species formerly placed in the genus Malcolmiella. Malmidea comprises more than 50 mostly tropical species that grow on bark, although a few grow on leaves.
Wirthiotrema is a genus of lichen-forming fungi in the family Graphidaceae. The genus was circumscribed in 2010 by Eimy Rivas Plata, Klaus Kalb, Andreas Frisch, and H. Thorsten Lumbsch, with Wirthiotrema glaucopallens assigned as the type species. Wirthiotrema contains species that were formerly considered part of the Thelotrema glaucopallens species group. The genus name honours lichenologist Volkmar Wirth, "for his numerous outstanding contributions to lichenology".
Halegrapha is a genus of lichen-forming fungi in the family Graphidaceae. It has nine species. The genus was circumscribed in 2011 by Eimy Rivas Plata and Robert Lücking, with Halegrapha chimaera assigned as the type species. The generic name honors American lichenologist Mason Hale.
Rhabdodiscus isidiatus is a species of corticolous lichen in the family Graphidaceae. Found in Sri Lanka, it was formally described as a new species in 2014 by lichenologists Gothamie Weerakoon, Robert Lücking, and Helge Thorsten Lumbsch. The type specimen was collected from the Elkaduwa Plantation in Matale at an altitude of 915 m (3,002 ft). The lichen is only known to occur at the type locality, which is a patch of mid-elevation, disturbed montane forest. The specific epithet isidiatus refers to the presence of isidia on the thallus. Rhabdodiscus isidiatus has a cream-colored to white, smooth to uneven thallus up to 5 cm (2 in) in diameter. The ascomata are rounded and prominent, measuring 0.7–1.0 mm in diameter with a 0.3–0.5 mm wide pore and a light brown rim. Its ascospores are hyaline, ellipsoid in shape, contain three thick septa, and measure 12–15 by 5–6 μm. Secondary chemicals present in the lichen include psoromic acid, subpsoromic acid, and 2'-O-demethylpsoromic acid.
Leucodecton coppinsii is a species of corticolous (bark-dwelling) lichen in the family Graphidaceae. It is found in lowland forests of Sarawak, Malaysia.
Astrochapsa sipmanii is a little-known species of corticolous (bark-dwelling) lichen in the family Graphidaceae. It is found in Singapore.
Heiomasia is a genus of corticolous (bark-dwelling), crustose lichens in the family Graphidaceae. It has five species.
Cruentotrema is a genus of corticolous (bark-dwelling) lichens in the family Graphidaceae. It has seven species.
Ocellularia rivasplatiana is a species of corticolous (bark-dwelling) lichen in the family Graphidaceae. Found in Singapore, it was formally described as a new species in 2015 by Gothamie Weerakoon and Robert Lücking. The type specimen was collected by the first author from a low-elevation primary forest in the Bukit Timah Nature Reserve. It is only known to occur at the type locality. The species epithet honours lichenologist Eimy Rivas Plata.
Thelotrema lueckingii is a species of corticolous (bark-dwelling) crustose lichen in the family Graphidaceae. Found in the laurel forests of Madeira, it was formally described as a new species in 2013 by Othmar Breuss. The species epithet honours German lichenologist Robert Lücking.
Ocellularia subudupiensis is a rare species of corticolous (bark-dwelling) lichen in the family Graphidaceae. Found in Singapore, it was formally described as a new species in 2015 by Gothamie Weerakoon and Robert Lücking. The type specimen was collected by the first author from a low-elevation primary forest in the Bukit Timah Nature Reserve. It is only known to occur at the type locality. The species epithet refers to its similarity with Ocellularia udupiensis. It differs from this lichen in its relatively rough thallus surface in addition to its secondary chemistry, as it contains three unidentified lichen products that are detectable using thin-layer chromatography.
Clandestinotrema is a genus of lichen-forming fungi in the family Graphidaceae. It has 17 species. They typically inhabit montane and cloud forest at higher elevations in the tropics.
Coenogonium atherospermatis is a species of lichen in the family Coenogoniaceae. Found in Tasmania, it was formally described as a new species in 2018 by lichenologists Gintaras Kantvilas, Eimy Rivas Plata, and Robert Lücking. The type specimen was collected by the first author near Little Fisher River at an altitude of 820 m (2,690 ft), where it was found in a cool temperate rainforest growing on Atherosperma moschatum. It is locally abundant at this location, where it usually occurs at elevations of more than about 500 m (1,600 ft). The species epithet refers to the genus of the preferred host tree. Within Tasmanian rainforest vegetation, Atherosperma is known for harbouring "a distinctive suite of lichens", including C. atherospermatis.
Coenogonium urceolatum is a rare species of corticlous (bark-dwelling), crustose lichen in the family Coenogoniaceae. Found in western Tasmania, it was formally described as a new species in 2018 by lichenologists Gintaras Kantvilas, Eimy Rivas Plata, and Robert Lücking. The type specimen was collected by the first author near Piney Creek, about 10 kilometres (6.2 mi) north of Zeehan, where it was found in a cool temperate rainforest, growing on an old, dry, shaded trunk of Nothofagus cunninghamii. It is only known from the type collection. The lichen has a pale greyish-greenish thallus lacking a prothallus. The species epithet refers to its characteristic small, urn-shaped, orange apothecia.
Dictyonema album is a species of basidiolichen in the family Hygrophoraceae. It is found in Mauritius, where it grows as an epiphyte on shrubs.
Topeliopsis acutispora is a species of crustose lichen in the family Graphidaceae. It is found in New South Wales and southern Queensland (Australia), where it grows on bryophytes.
Gyalectidium floridense is a species of foliicolous (leaf-dwelling), crustose lichen in the family Gomphillaceae. It is found in the southeastern United States, where it grows on the leaves of Citrus and palmetto.
