Tasmanian Tree Fern covered in what looks like a Lichen?
Hi, this is my tree fern which I’ve had for about 10 years now. Over the past 18 months it’s trunk on one side has grown this amazing Lichen (well that’s what it looks like to me, I’m no expert) - just wondered if it is likely to harm it, and if so what I can do about it. The strange thing is it only seems to form on the old trunk, not the growth since I’ve had it. The plant stays out all year in a sheltered yard on the South Coast of Devon with just a ball of fleece in its crown to protect it from frost. The fern grows two complete sets of leaves each year, once at the start of summer and one at the end. Any advice would be appreciated, thanks in advance.