Symbiosis

Algae + Fungi = Lichen

One specific kind of algae + One specific kind of fungi = One specific kind of lichen

Think of algae and fungi as teammates with the new team called "Lichen."

Sandy Nelson does a fine job of describing this symbiotic relationship here.

Now add Robley: lying flat-out in the muddy spongy beds on the shore of Lake Cheston. Sun and a temperature in the 50s. A camera in hand. Now this is symbiosis.

Specific algae + Specific fungi + Robley = British Soldier Lichen Joy