Tasmanian Tree Fern covered in what looks like a Lichen?
edited November 2019
Just seen this thread ; if it's of any interest to anyone , my own tree-fern has seemingly the exact same lichen growing on one side of the trunk .
Has been on for several years with no harm whatsoever , and that's living in 'dry' Lincolnshire ! (Double our average rainfall already in 2019) .
Everywhere is waterlogged .
Do you have a closer photo?.. as a general rule lichen doesn't grow that fast.
if you stand still long enough in Devon, you'll have lichen growing on you.