Richard Troy McMullin

Xanthosyne is fungal genus in the family Lecanoraceae. The genus was established in 2024 to accommodate a group of crustose lichens that had previously been classified under various names, most notably as Lecidea varians, which was originally described in 1814. These lichens form thin crusts on tree bark and are characterised by their variable appearance, ranging from pale grey to yellow-green, with small black fruiting bodies and diverse chemical compositions. The genus is most commonly found in the humid temperate forests of eastern North America, though it also occurs in parts of

Chaenotricha is a small genus of lichen-forming fungi in the family Coniocybaceae. Species live fungicolously, growing on the fruiting bodies of the poroid bracket fungus Trichaptum, and produce tiny, pin-like, dust-sporing fruiting bodies typical of calicioid lichens. The genus was established in 2023 to accommodate a distinct lineage of Trichaptum specialists. These lichens occur on standing dead conifer trunks and snags in boreal and hemiboreal forests of northern Europe and North America. The two described species are distinguished primarily by stalk length and ascospore size, though DNA

Cyphellostereum georgianum is a corticioid basidiolichen first described in 2019 from the coastal plain of Georgia, USA. A member of the family Hygrophoraceae, it sits within the Dictyonema clade, a group of lichens that partner a basidiomycete fungus with filamentous cyanobacteria. Its closest relative is the South‑Carolinian C. jamesianum, but the two differ markedly in thallus texture and color.

Chaenotricha cilians is a species of pin lichen in the family Coniocybaceae. It was described as new to science in 2023 from Estonia, and is one of two species in the newly established genus Chaenotricha. Unlike most lichens, it grows on the fruiting bodies of bracket fungi in the genus Trichaptum rather than on bark or rock, producing tiny dark pin-like structures along the edges of its host. The species is known from boreal and hemiboreal forests across northern Europe, with a single record from Canada.

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