Cladonia macilenta. This species and the next can be difficult to separate. The podetia of this species may be wholely sorediate, or with squamules covering it towards the base as in this example. It is usually fertile with large, often single apothecia at the tip. It may also carry red pycnidia. If infertile, it can be very hard to deparate from other non red apothecia species. It should be tested with K to separate it from Cladonia polydactyla, which is K+ yellow to orange. Cladonia macilenta is K-. It is a common species occurring on heathy banks, dead wood and rocks. This photograph was taken on sand rock outcrops at the Eridge Rocks Reserve in East Sussex.