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Yes,I also think this is Heterodermia. Moreover, I believe this can be either H. linearis or H. leucomela (see the discussion under observation 128003 for a similar specimen), though I know nothing about their existence in your region of Africa.
The first of these species I never saw, but there are some features that point in that direction: Thallus robust, the lobes are linear, is fertile, seems to have black pycnidia (magnifying the first photos some dots are visible), lacks soredia (?).
On the contrary, H. leucomela, is smaller, the lobes are more branched, wavy and reflexed at apices, is usually infertile, lacks pycnidia and frequently has soredia. You can see some of my observations of this species searching by the name.
Created: 2013-05-16 16:51:51 CDT (-0500)
Last modified: 2013-05-17 17:20:06 CDT (-0500)
Viewed: 17 times, last viewed: 2016-02-20 22:39:47 CST (-0600)