Tremella parmeliarum

The basidiomata (fruiting bodies) of Tremella parmeliarum are lichenicolous, growing on the thalli of species in the genus Parmotrema. They manifest as superficial, brownish galls that are typically convex, with constricted bases and often lobed or tuberculate features, ranging from 0.4 to 4 mm in diameter. The structure lacks hyphidia. The basidia are 2–4 celled, with longitudinal, oblique, or transverse septa (internal partitions), measuring 12–23 by 5–15 μm. The basidiospores are 5–8 by 4–7 μm. Mature asteroconidia are also present.

Tremella parmeliarum has a broad distribution, occurring across various regions. It has been found in Europe, including Ireland and Portugal, and in Macaronesia, with records from the Azores, Canary Islands, and Madeira. In North America, it is present in Mexico and the US, specifically in Alabama, Arkansas, and Virginia. The fungus is also found in Central America, particularly in Panama, and in the Caribbean, including the Dominican Republic. In South America, it has been reported in Bolivia, Brazil, Chile, and Ecuador. Its distribution extends to the Indian Ocean, with a presence in Madagascar, and it is found in Asia, including India and Nepal. Additionally, Tremella parmeliarum occurs in Oceania, including Australia and Papua New Guinea.

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