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| Photo Credit: All Images framed are copyrighted by Heidi-Ann Kennedy-Fourkiller |
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Auricularia angiospermarum
(Hi-Res Zoomable Photo)
My recent field observations in Eastern Oklahoma highlight a fascinating example of fungal taxonomy and subterranean ecology. Initially presenting as a terrestrial fruiting body among leaf litter, careful excavation revealed the specimen anchored to buried oak root systems, confirming its identity as the hardwood-dependent jelly fungus Auricularia angiospermarum.
Taxonomic Reclassification
Historically, North American jelly fungi exhibiting this morphology were broadly categorized under the European species name Auricularia auricula-judae.
Modern phylogenetic sequencing has established distinct North American clades separated primarily by host ecology.
Auricularia americana designates specimens feeding on gymnosperms, such as pines and cedars, while Auricularia angiospermarum is the specific classification for those consuming angiosperms, including oaks and hickories.
Auricularia angiospermarum
(Hi-Res Zoomable Photo)
Morphological Characteristics
Fruiting bodies present a distinctive gelatinous, rubbery texture that remains highly elastic when actively hydrated.
The macroscopic structure is deeply folded and ear-shaped, featuring a translucent, brownish-orange to reddish-brown hue.
When environmental moisture drops, the tissue shrinks, darkens, and hardens into a brittle crust, effectively entering stasis until rainfall triggers rehydration.
Ecological Function
Auricularia angiospermarum operates as an obligate saprobe, deriving cellular nutrients exclusively from decaying hardwood.
It functions biologically as a white-rot fungus, deploying specific enzymes to degrade lignin within the wood matrix while leaving the lighter cellulose largely intact.
While most commonly observed on exposed logs, stumps, and fallen branches, the mycelium can fruit from entirely buried root systems, temporarily mimicking the terrestrial growth habits of unrelated ascomycete ground fungi.
Eastern Oklahoma
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