11. Crustose has learned to adapt to its environment.12. The thallus of a crustose lichen has a patchwork or crazy-paving appearance. 13. The spores of some crustose lichens, however, can develop on these surfaces. 14. Eventually the crustose spores form small and round thalli and increase in diameter yearly. 15. Some people who study lichens ( lichenologists ) group squamulose lichens separately from crustose lichens. 16. These patches of pink " paint " are actually living algae : crustose coralline red algae. 17. Crustose lichens may also be used for dating rock surfaces, through a technique called lichenometry.18. Crustose and squamulose lichens have an upper cortex, but do not have a lower cortex.19. "Pertusaria " is a large genus of crustose lichens in the family Pertusariaceae. 20. In this article, we include wolf lichens as a subsection of crustose lichens growing on wood.
