The Rocktripe Lichens

This is another large, taxonomically-difficult genus of foliose lichens that grow on rock attached by a single point in the center. They are also somtimes called belly-button or navel lichens.

Here are pictures of 19 species (including the two North American species of the closely-related genus Lasallia):

U. americana
U. angulata
U. cylindrica
U. deusta

U. havaasii
U. hyperborea
U. krascheninnikovii
U. lambii

U. leiocarpa
U. mammulata
U. muehlenbergii
U. phaea

U. polyphylla
U. proboscidea
U. torrefacta
U. vellea

U. virginis
L. papulosa
L. pensylvanica

Umbilicaria americana
(frosted rocktripe)

Umbilicaria angulata
(starred rocktripe)

Umbilicaria cylindrica
(fringed rocktripe)

Umbilicaria deusta
(peppered rocktripe)

Umbilicaria havaasii
(rippled rocktripe)

Umbilicaria hyperborea
(blistered rocktripe)

Umbilicaria krascheninnikovii
(salted rocktripe)

Umbilicaria lambii
(windward rocktripe)

Umbilicaria leiocarpa
(textured rocktripe)

Umbilicaria mammulata
(smooth rocktripe)

Umbilicaria muehlenbergii
(plated rocktripe)

Umbilicaria phaea
(emery rocktripe)

Umbilicaria polyphylla
(petalled rocktripe)

Umbilicaria proboscidea
(netted rocktripe)

Umbilicaria torrefacta
(perforated rocktripe)

Umbilicaria vellea
(fleecy rocktripe)

Umbilicaria virginis
(blushing rocktripe)

Lasallia papulosa
(common toadskin)

Lasallia pensylvanica
(charred toadskin)