Posted: 10/06/2017 at 09:35
Hi Felicity - dog lichen is usually an indication of damp, shady, usually compounded ground, so if you address that, it should be less of a problem in future. Scarifying, feeding and regular mowing will get the grass in good shape.
In the meantime, I think one of the weed and feed products will get rid of it. I used to get it in my old garden where I had two large trees - that's the normal situation for it. As long as I used a product in spring, it didn't appear through the season. I didn't compost it after using weed and feed, but if you remove it by digging out, I'm sure you can compost it - it's not an issue