Assertion: lichen's cyanobacteria | /r/HasProperty | held on upper or lower surface
Facets:
value: in small pustules
type: LOCATION
value: in lichens
type: LOCATION
Source sentences:
text: In lichens that include both green algal and cyanobacterial symbionts, the cyanobacteria may be held on the upper or lower surface in small pustules called cephalodia.