Subterranean forests are not a figment of a science-fiction writer’s imagination, but actually exist. The Hayward Gallery’s ‘Among the Trees’ exhibition in 2020 included a remarkable photograph by Rachel Sussman of a 13,000-year-old tree, Parinari capensis, growing beneath the red sandy soil of South Africa’s savannah. Or rather, it showed the uppermost crown, the only part of the tree in …
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