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Genea harknessii
Genea harknessii spores
Scientific classification
Kingdom:	Fungi
Division:	Ascomycota
Class:	Pezizomycetes
Order:	Pezizales
Family:	Pyronemataceae
Genus:	Genea
Species:	G. harknessii
Binomial name
Genea harknessii Gilkey 1916

Genea harknessii, commonly known as the dark geode truffle, is a species of fungus in the genus Genea. The species was described by Helen Gilkey in 1916. The mature fruit has a convoluted, brain-like appearance and often is no larger than an adult's thumbnail. The exterior is dark brown (to nearly black) with a hollow interior. The flesh between the dark interior and exterior 'skin' is white to pale grey.

G. harknessii grows underground in forests, especially white oak forests, but also in coniferous forests.

References

Genea harknessiiMycological characteristics
	Smooth hymenium
	Hymenium attachment is irregular or not applicable
	Lacks a stipe
	Ecology is mycorrhizal
	Edibility is unknown

1. Arora, David (1986). Mushrooms demystified: a comprehensive guide to the fleshy fungi (Second ed.). Berkeley: Ten Speed Press. ISBN 978-0-89815-169-5.
2. Gilkey, Helen (1939). Tuberales of North America. Corvallis, OR: Oregon State University. p. 20. ISBN 9780598544476.
3. "Fruiting patterns and habitat associations of PNW truffles". www.natruffling.org. Retrieved 2021-01-12.

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