Exidia glandulosa
| Exidia glandulosa | |
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| Scientific classification | |
| Kingdom: | Fungi |
| Division: | Basidiomycota |
| Class: | Agaricomycetes |
| Order: | Auriculariales |
| Family: | Auriculariaceae |
| Genus: | Exidia |
| Species: | E. glandulosa |
| Binomial name | |
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Exidia glandulosa (Bull.) Fr. (1822) |
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| Synonyms | |
Exidia glandulosa (common names black witches' butter, black jelly roll, or warty jelly fungus) is a jelly fungus in the family Auriculariaceae. It is a common, wood-rotting species in Europe, typically growing on dead attached branches of oak. The fruit bodies are up to 3 cm (1.2 in) wide, shiny, black and blister-like, and grow singly or in clusters. Its occurrence elsewhere is uncertain because of confusion with the related species, Exidia nigricans.
The species was originally described from France as Tremella glandulosa by Bulliard in 1789. It was subsequently placed in Exidia by Fries in 1822. Fries, however, modified Bulliard's species concept to include a second, effused, coalescing species—the name Exidia glandulosa serving for both. This combined concept was used until Neuhoff separated the two species in 1936. Unfortunately, Neuhoff gave the name Exidia glandulosa to the effused species, adopting the name Exidia truncata for Bulliard's original species. This error was pointed out by Donk in 1966, who proposed the name Exidia plana for the effused species, now replaced by Exidia nigricans.
Molecular research has shown that Exidia glandulosa and E. nigricans, though similar, are distinct.
The fungus is commonly known as "black witch's butter", "black jelly roll", or the "warty jelly fungus".
Exidia glandulosa forms dark sepia to blackish, rubbery-gelatinous fruit bodies that are top-shaped (like an inverted cone) and around 3 cm (1.2 in) across. They are firm when fresh, but become lax and distorted with age or in wet weather. The fruit bodies occur singly or in small clusters. The upper, spore-bearing surface is shiny and dotted with small pimples or pegs. The undersurface is smooth and matte at first, but develops a dense covering of small, gelatinous spines. The fruit bodies are attached to the wood at the base. The spore print is white. When the fruit bodies are dried they can shrink to form a flattened black crust.
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