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The ones in the center are being swallowed and don’t look round anymore. If I encountered such morphology on two neighboring thallii, I’d think I have two different species.
It’s like the thallus just keeps growing, finally overgrowing its own apothecia.
Of interest are different types of apothecia – the ones in the center are quite distinct from the ones towards the edges.
While not 100% sure, by examining specimens in situ it seems that algae-populated circles are leftovers of thalli of the same lichen.
Created: 2015-06-20 15:51:30 PDT (-0700)
Last modified: 2015-06-20 16:06:37 PDT (-0700)
Viewed: 22 times, last viewed: 2016-10-25 10:20:00 PDT (-0700)