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Exidia nucleata is a fascinating and common jelly fungus characterized by its gelatinous, often brain-like or convoluted fruiting bodies that are typically translucent to whitish, and embedded with distinctive white, granular inclusions (nuclei). These inclusions are sterile aggregations of hyphae, a key diagnostic feature. It is a saprobic fungus, playing an important role in the decomposition of dead hardwood, particularly oak and beech.
How to Identify
- Cap
- Not applicable, as Exidia nucleata does not form a cap in the traditional sense. The entire fruiting body is the reproductive structure.
- Gills
- Not applicable, as Exidia nucleata is a jelly fungus and does not produce gills.
- Stem
- Not applicable, as Exidia nucleata is sessile or broadly attached to the substrate without a distinct stem.
- Flesh
- Gelatinous, translucent, and somewhat rubbery when fresh. It becomes hard and horny when dry, rehydrating to its original texture when wet.
- Fruiting body
- The fruiting body is typically 1-5 cm across, irregularly lobed, convoluted, or brain-like, often appearing as a cluster of smaller, fused lobes. It is gelatinous, translucent to whitish or pale grey, sometimes with a yellowish or brownish tinge, especially with age or drying. The most distinctive feature is the presence of numerous small, opaque, white, granular inclusions (nuclei) embedded within the gelatinous mass. These are sterile aggregations of hyphae and are visible to the naked eye.
- Habitat
- Saprobic on dead hardwood, particularly fallen branches and logs of oak (Quercus spp.) and beech (Fagus spp.). It can also be found on other deciduous trees. It typically grows on decorticated (barkless) wood but can sometimes be found on bark.
Key Facts
- Cap surfaces: Not applicable (no cap)
- Growth Form: Effused-reflexed to pulvinate, often confluent
- Spore Print: White
- Body color: Translucent to whitish, pale grey, sometimes yellowish or brownish
- Odor: Indistinct
- Flesh bruises: Does not bruise
- Height: Not applicable (sessile)
- Cap Diameter: 1-5 cm across (fruiting body)
- Nutrient gathering: Saprobic
Safe
SafeExidia nucleata is generally considered non-toxic, but it is not regarded as a culinary mushroom due to its insubstantial and gelatinous texture. There are no known reports of toxicity from accidental ingestion. However, it lacks any desirable culinary qualities.
Quick Check
- Odor: Indistinct or mild
- Fruiting: Year-round, especially after rain, but most common in cooler, moist conditions from late summer through winter.
- Substrate: Dead hardwood, particularly oak and beech.
Where to Find
Deciduous Forests
Commonly found in deciduous and mixed forests where dead hardwood is abundant.
Fallen Logs and Branches
Primarily grows on dead, decaying logs and branches of hardwood trees, especially oak and beech.
Wood Piles
Can occasionally be found on wood piles or other accumulations of dead hardwood.
Finding Tips
Look for Hardwood
Focus your search on areas with fallen hardwood trees, particularly oak and beech. It prefers decorticated wood.
Check After Rain
Like many jelly fungi, Exidia nucleata is most prominent and easily identifiable after periods of rain when its gelatinous texture is fully hydrated.
Examine Closely
The distinctive white granular inclusions are key. Look closely at the translucent fruiting body to confirm their presence, as this differentiates it from other similar-looking jelly fungi.
Similar Species
Witch's Butter
jelly fungus
Also known as: Yellow Brain Fungus, Tremella mesenterica
White Brain Fungus
jelly fungus
Also known as: Tremella fuciformis
Amber Jelly Roll
jelly fungus
Also known as: Exidia recisa
Witches' Butter
jelly fungus
Also known as: Dacrymyces chrysospermus
Scientific Classification
- Phylum
- Basidiomycota
- Class
- Agaricomycetes
- Order
- Auriculariales
- Family
- Auriculariaceae
- Genus
- Exidia
Storage Information
- Max Temperature: Not applicable for culinary storage.
- Freezing duration: Not applicable for culinary storage.
- Min Temperature: Not applicable for culinary storage.
- Refrigeration: Not applicable for culinary storage.
How to Clean
Not typically collected for consumption. If for observation, a soft brush can remove loose debris. Avoid washing, as its gelatinous texture can be easily damaged.
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