“crustlike”簡單造句，crustlike造句子

A fungus, usually of the class Ascomycetes, that grows symbiotically with algae, resulting in a composite organism that characteristically forms a crustlike or branching growth on rocks or tree trunks.

"Lichens may form a thin, crustlike, tightly Bound covering over their substrate (e.g., cracks in rocks), or they may be small and leafy, with loose attachments to the substrate."