I just finished Oliver Sacks’ excellent Everything in Its…

I just finished Oliver Sacks’ excellent Everything in Its Place. In it, he mentioned as an aside that the Ginkgo biloba tree is hundreds of millions of years old, and its phenotype has been practically frozen since then – a living fossil.
Of course, this is the same tree that grows ぎんなん (Ginkgo nuts), an East Asian delicacy found in many dishes, 茶碗蒸し (Chawanmushi) for example.
Ginkgo has been around so long, it predates the dinosaurs! And we still eat it! How cool is that. This got me thinking – what are the oldest foods we consume today?
Criteria:
1. Must be edible by humans
2. Must be morphologically unchanged since its fossil age

Kingdom	Species	Common name	Age (years)
Animalia	Tachypleus tridentatus	Horseshoe crab	480M
Plantae	Ginkgo biloba	Maidenhair nuts	290M
Plantae	Bryoria fremontii	Wila	250M?
Plantae	Cladonia rangiferina	Reindeer lichen	250M?
Plantae	Cycas revoluta	Sago palm	200M
Plantae	Araucaria araucana	Monkey puzzle tree nuts	160M
Plantae	Equisetum arvense	Horsetail	140M
Plantae	Welwitschia	-	112M
Plantae	Osmundastrum cinnamomeum	Cinnamon fern	70M
Plantae	Trapa natans	Water caltrop nuts	66M
Plantae	Nelumbo lutea, Nelumbo nucifera	Lotus	65M+

Note: I’m a hobbyist, and not a paleobotanist. Additions and edits are welcome, if I misclassified or missed anything.
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