Hello all!
This past August I took a trip to Kauai's Koke'e State park where I found a minutely fruiticose (branch diameters less than .1mm), cushion forming cyanolichen, tucked in pits and crevasses of the basalt boulders lining the edge of a parking lot. There appears to be a cellular cortex (visible in LM and SEM), rhizohyphae anchoring the thali to the substrate, and a filamentous cyanobacterial photobiont. Very sparkly under the dissecting scope as well. I've been leaning towards genus Scytinium based off these features and gut feeling, but unfortunately I have been unable to find supporting literature. I figured, even though it is not a NW lichen, I'd pop a post in here to see if anyone has any thoughts on the find!
I've included some images, but there are more here (https://www.inaturalist.org/observations/246391112).