Observation 208694: Dermatocarpon Eschw.

When: 2015-07-03

Collection location: Atascadero, California, USA [Click for map]

35.4625°N 120.6761°W 277m [Click for map]

Who: J-Dar

No specimen available

Occurs on shady side of large sandstone boulder outcrop in sycamore-oak riparian habitat of Atascadero Creek on the side of Highway 41 West.

Whitish umbilicate lichen with reddish-brown perithecia, medulla light pinkish. Underside light brown, no rhizines. Occurs as a single thallus or in overlapping groups. K-, C-, DC- on thallus and medulla. Iodine test on medulla not conducted.

In order to get to Dermatocarpon americanum in the Nash key you have to choose thallus lobe singular. Several specimens showed overlapping lobes that would make you think the thallus was multi-lobed, but maybe these are each individual single lobes growing close together?


Thallus underside

Proposed Names

31% (2)
Used references: Nash Sonoran Flora
61% (2)
Recognized by sight

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
“Multilobed” is such a poor choice of terminology!
By: Jason Hollinger (jason)
2015-07-04 00:53:33 -03 (-0300)

They are so contorted and ragged that it’s impossible to tell. But fortunately, the “multilobed” species look very different.

But without Melzer’s reagent and spore size, I agree it’s best to leave it at genus. This is a confusing enough genus without us muddying the waters with wishful thinking! ;)