In 2009, I've been studying the book Lichens of North America. Here is a quote from page 228. It mentions Cladina evansii, which is the most common reindeer lichen on the Emerald Coast of Florida that I see.
Under Cladina stellaris comments
Two North American reindeer lichens form rounded, foam-like tufts: the yellowish green Cladina stellaris, which covers thousands of square miles of boreal woodland soil, and the almost white C. evansii found on the southeastern coastal plain. Cladina evansii contains atranorin instead of usnic acid and is K+ yellow, PD-, C-, and KC-.
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