https://en.wikipedia.org/wiki/Prototaxites https://en.wikipedia.org/wiki/Prototaxites has more context. Tree sized and shaped living thing that wasn't a plant,

https://en.wikipedia.org/wiki/Prototaxites https://en.wikipedia.org/wiki/Prototaxites has more context. Tree sized and shaped living thing that wasn't a plant, which probably fed and reproduced like a fungus but per this latest research wasn't a fungus either, by far the largest known organism on land up to that point, in a time when land animals barely existed. Unsettling!