Learn your Lichens Series
This pale grey - grey-green crustose lichens grows on acid rocks, such as "slate" tombstones, It also grows on the greywacke (a type of metamorphosed sandstone) which form many glacial eratics in our area
The thallus is divided into areoles. The areoles have soralia (minute patches with powdery soredia). - which are a lighter green than the rest of the areole. - See glossaries for definitions of these
Glossary - Last Dragon
Glossary - Irish Lichens
The first time I was shown this (thanks AP) on acid tombstone in Ingleton, a big effort was made to see whether the soralia (the minute powdery patches which house the powdery soredia) were at the centre of the aereoles or a the edge. L soralifera has them at the centre.
|St Mary's Ingleton|
|Different year - same tombstone - St Mary's Ingleton|