Assertion: squamulose lichen | /r/CapableOf | lack lower cortex
Facets:
Source sentences:
text: The medulla is the lowest layer, and may form a cottony white inner core for the branchlike thallus, or it may be hollow.:159 Crustose and squamulose lichens lack a lower cortex, and the medulla is in direct contact with the substrate that the lichen grows on.