Lichen

[RogerB]

From what I can see online I think so. I don’t know the rubberised horsehair product, perhaps it’s more versatile than scouring pads. R-

[platelayer]

I have used rubberised horse hair on this diorama.

[RogerB]

So, do you tease it out to give a random appearance? R-

[platelayer]

Yes you do, or trim with scissors to make random shapes.

[Steve M]

Yes, Roger.
It comes in flat slabs - slice it into strips, pull it apart and spray it with grey/brown paint. Spray with adhesive (I use layering spray for static grass) then sprinkle scenic scatter onto it. Trim any loose bits with scissors.
I made these for Low Ghyll.

2019-10-12_08-37-36 by Steve Mumford, on Flickr

[RogerB]

Looks good stuff. If only my OCD would allow me to be that random. R-

[Guildman]

My OCD insists I be accurate<G> So random is right.

Horsehair hedges need a careful trim with very good scissors when finished to get rid of any fly away tendencies at the edges.

Martin

[RogerB]

Each to their own. R-