Yellow Scale Lichen?

Description:

I've never seen so much lichen before in one area (around the lake), according to an information board it's because there's not much acid rain in the area. Lichens are a fungus and an algae that work together to survive. Here's a similar spotting: http://www.projectnoah.org/spottings/169... I guess the sunnier it is for X. parietina, the more yellow (and less green) it is. I think the top layer varies in thickness or pigmentation depending on how much light the organism wants to have reach the chlorophyll of the algae.

Notes:

Xanthoria parietina? X. elegans? Caloplaca flavescens?