Heterodermia species- Kampala, Uganda

ID : 5 posts by 2 authors. Attachments (1).
The photo is micro one. Please help me for ID
Heterodermia sp. (Lichen)
This is a species of Heterodermia - Physciaceae. Hereafter please send the complete location details (State, District, nearby village, altitude and date of collection)  of the  specimen/photographs from where it was taken. 
That photo taken at Uganda International School,Kampala,Uganda on 25-03-2014.