While exploring the information on biodiesel, it became clear that the feedstock for this all around. As it turns out, blue-green algae - cyanobacteria, or pond scum - is a good producer of hydrocarbons. Knowing that lichen is made from cyanobacteria and fungus, and considering the abudance of the oil allegedly present, it seemed that I should be able to pull a handful of lichen from a tree, smash it up in a glass of hot water, steep, strain, allow the water and oil to separate, dry what floats on top, and I should have a flammable residue. It worked!!! How about that? The stuff really does grow on trees. I guess I just had to convince myself that it really is that easy.