Desription ⁴

FRUITBODY A mass of lobes or brainlike sections 2–5 cm across and 1–3 cm high; surface bald, moist, dull to bright yellow or orangish yellow; flesh gelatinous, yellow; fading and sometimes becoming amorphous and poorly defined with old age or in wet conditions; drying to an orangish yellow crust. ODOR and TASTE not distinctive. SPORE COLOR white. ECOLOGY Parasitic on the mycelium of species of Peniophora (a genus of crust fungi); growing alone or in amorphous clusters on the decaying sticks and logs of oaks and other hardwoods (usually when bark is still adnate); usually appearing in spring, in temperate areas, but also appearing in summer, fall, and winter; widely distributed in North America, but possibly less common in western North America. The illustrated and described collections are from Illinois and Indiana.

SIMILAR Tremella aurantia, Dacrymyces chrysospermus

NOTES Yellow Brain fungus grows on dead wood that has been attacked by wood-rotting fungi of the Peniophora genus. One of the most common Peniophora crust fungi in Britain and Ireland is Peniophora incarnata, commonly known as Rosy Crust fungus. Very little or none of the Peniophora may be visible if Tremella mesenterica has fully colonised all of the infected surface of the wood, and so it may look as though Yellow Brain is feeding directly on the host wood.

https://www.mushroomexpert.com/tremella_mesenterica.html
https://www.first-nature.com/fungi/tremella-mesenterica.php
https://www.first-nature.com/fungi/dacrymyces-chrysospermus.php

TODO This needs better photos showing Peniophora. You have to wonder how many of these are misindentifications.

Summary ⁵

Tremella mesenterica (common names include yellow brain, golden jelly fungus, yellow trembler, and witches' butter) is a common jelly fungus in the Tremellaceae family of the Agaricomycotina. It is most frequently found on dead but attached and on recently fallen branches, especially of angiosperms, as a parasite of wood decay fungi in the genus Peniophora. The gelatinous, orange-yellow fruit body of the fungus, which can grow up to 7.5 cm (3.0 in)

Fontes e Créditos

1. (c) P Holroyd, alguns direitos reservados (CC BY), uploaded by P Holroyd
2. (c) Erika Mitchell, alguns direitos reservados (CC BY-NC), uploaded by Erika Mitchell
3. (c) Katja Schulz, alguns direitos reservados (CC BY), http://www.flickr.com/photos/86548370@N00/7359978236
4. (c) W.Coyote, alguns direitos reservados (CC BY-SA)
5. Adaptado por W.Coyote de uma obra de (c) Wikipedia, alguns direitos reservados (CC BY-SA), https://en.wikipedia.org/wiki/Tremella_mesenterica

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