Cream coloured lichen which looks as though someone has taken a brush and some emulsion and painted it on the lower trunk of a fallen pine tree.
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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rather than a lichen. There are several white ones, and it may be difficult to identify it. Hyphodontia (it has at least two other generic names offered in my book!) sambuci is usually found on elder, but superficially this looks a possibility.
I think you may be understating the issue. There are probably dozens that look like a coat of whitewash. Microscope job, if you can find the keys!
Wild Flower Society member
Lat/Lng: 51.9467, -0.6663
OS grid ref: SP917284
On a path through pine trees in Rushmere