Arthonia platyspilea
| Spore | Ascus | Lichen Index |
A thin section of the ascomata showing globose or subglobose asci which are typical of this species and many other Arthonias. Note the spore escaping at the upper right corner.
Each individual ascus contains 8 spores. This is true for most lichen species but the number can vary from just 1 to 100's.