Lasallia papulosa
![Lasalia papulosa](https://ohiomosslichen.org/wp-content/uploads/2013/08/Lasalia-papulosa.jpg)
Lasalia papulosa photo by Bob Klips
![Lasallia papillosa wet and dry](https://ohiomosslichen.org/wp-content/uploads/2013/08/Lasallia-papulosa-wet-and-dry.jpg)
Lasallia papulosa wet and dry photo by Ray Showman
DIAGNOSTIC FEATURES: Central attachment; blistered thallus; undersurface pale brown, pitted; no rhizines except centrally; compare with L. pensylvanica with undersurface uniformly black, papillate-areolate.
ECOLOGY: This Appalachian species is fairly common in unglaciated Ohio; usually found on sandstone, very rarely on soil or bark adjacent to colonies on rock.