I had a what looked like a fuscidea ascus type reaction to this lichen which threw me for quite some time. However, if you add up the following you get to Porpidia platycarpoides and Porpidia macrocarpa. These two can be separated by K+ yellow medula on marcrocarpa and K+ red on medula of platycarpoides. There is also a difference in the height of the hymenium of these two. Here are the features of this lichen:
Apothecia up to 3mm
Spores simple and approx 20µm long
Crustose areolate white thallus
Black apothecia
On rocks
Thallus K+ yellow
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| Porpidia macrocarpa |
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| Porpidia macrocarpa section |
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| Porpidia macrocarpa spore |
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| Porpidia macrocarpa ascus KI reaction |
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| Porpidia macrocarpa through the microscope |
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