Scientific name: Exidia glandulosa (Bull.) Fr.
Derivation of name: Glandul- means "gland" and -osa
means "an abundance of." Glandulosa refers to the glands
on the surface of the basidiocarp.
Synonyms: Tremella glandulosa Bull.
Common name(s): Black jelly roll.
Occurrence on wood substrate: Saprobic; forming
irregular masses on decaying deciduous wood; May through
Dimensions: Individual fruit bodies are 1-2 cm wide and up
to 1.3 cm high. Extensive masses of fused fruitbodies may be
18 cm or more long.
Description: Brainlike to irregularly contorted gelatinous
fruitbodies, fusing together to form large masses; blackish-
brown to olive-brown or black; surface shiny with numerous
small black-brown glandular dots.
Comments: Upon drying, Exidia glandulosa becomes a
thin, black-dotted crust. It can rehydrate to look like a fresh
More information at RogersMushrooms.com:
Figure 1. The black, convoluted mass of Exidia glandulosa.
Photo © William Roody.
Figure 2. Another view of Exidia glandulosa, just as dark,
just as irregular. Photo © Dianna Smith.
Figure 3. This is a dried
specimen. Photo © Dianna Smith.
This yellow fungus growing on Exidia glandulosa
was collected during a NEMF foray. It was identified as
Hypocrea sulphurea, an ascomycete. See Figure 5. Photo
© Gary Emberger.
Figure 5. Hypocrea sulphurea is associated with wood
colonized by Exidia spp. It is thought to parasitize the jelly
fungus but perhaps is also capable of saprotrophic growth
on the dead wood, even after external evidence of Exidia is
gone. The numerous small dots on the specimen above mark
the location of perithecia. Photo © Gary Emberger.