More Irish Arthonia’s

I’m coming across more Arthonia’s from SW Ireland that don’t entirely make sense, but perhaps I’ve been looking at them for too long!

Below are both from the same small Holly twig and both had 3-4 septate spores with upper cell enlarged.

1. I initially wondered possibly Arthonia ilicinella but the epithecium wasn’t red-brown?

Very thin thallus (possibly with brownish prothallus) with irregularly rounded apothecia. In section K+ green, spores 3-4 septate, (15-)17-20 x (6-)7-9 µm, upper cell enlarged

[attachment=8]z Arthonia Q4 250628 003 q ilicinella.jpg[/attachment]

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Q2. Pale greyish-brown thallus, irregularly shaped apothecia, not pruinose and without surrounding bark cells. In section K+green, spores 3-4 septate, 13-17x 5-7 µm, upper cell enlarged

[attachment=2]z Arthonia Q5 250628 009 not elegans.jpg[/attachment]

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