Fern trees in the rainforests next to the glaciers. The silver fern, by the way, is the national symbol for New Zealand. I'm not sure if I've encountered an silver fern during my hikes. I did encounter trees like these in Australia in the Daintree National Park. They tell the tourists that these mighty trees grow about one to three centimeters a year. I don't know if this is true or not, but you can tell the age of the tree by its height. There were signposts showing where the glaciers had receded from 1950 and even 1750. You could tell that the trees in those areas were clearly of limited height, so maybe it's not a bunch of crap they tell the tourists.