This was pretty firm and it doesn't look very flattened to me, so for me it keys to D. alectoroides and not D. leucophaea in Brodo (2016). Certainly looks more like http://www.sharnoffphotos.com/lichensB/dendrographa_alectoroides.html than like http://www.sharnoffphotos.com/lichensB/dendrographa_leucophaea.html
Ken-ichi Ueda
2016-09-25
2016-09-25 10:59:11 AM PDT
United States of America, California, Elephant Rock, Tomales, Marin County, CA, USA