Grey lichen covering large areas of grassy dunes...
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
Yes, the presence of slightly raised patches of green algal cells is pretty standard amongst all Cladonia species that lack a covering of soredia, and use of the character in identification keys is actually rather irresponsible in my view.
It does NOT reliably separate rangiformis from furcata. or zopfii from uncialis, and as Nigel says, C. portentosa often shows the same character. Age, dampness of the specimen, local environment, all affect this.
Fortunately, no doubt here. Excellent material of C. rangiformis.
Lat/Lng: 53.3706, -6.1392
OS grid ref: SG247939