When: 2017-07-01

Collection location: Rosebud, Missouri, USA [Click for map]

Who: Judi T. (AvidAmateur)

No specimen available

On sandstone boulders scattered throughout this oak-hickory woods.


Copyright © 2017 Judi Thomas
Copyright © 2017 Judi Thomas
Copyright © 2017 Judi Thomas
Copyright © 2017 Judi Thomas
Copyright © 2017 Judi Thomas
Copyright © 2017 Judi Thomas
Copyright © 2017 Judi Thomas

Proposed Names

-13% (2)
Used references: lichenportal.org, mO observations
-30% (2)
Recognized by sight
28% (1)
Recognized by sight

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

= Observer’s choice
= Current consensus


Add Comment
Jason and J-Dar, thank you both for your helpful and extensive comments.
By: Judi T. (AvidAmateur)
2017-08-05 08:16:57 PDT (-0700)

Sorry I didn’t have a chance to thank you earlier; I’ve been away from my computer for a while. I have looked back in my records and can’t be sure about the last 2 photos you both mentioned. They could have been on wood that was adjacent to the sandstone boulder. That is probably an oversight on my part. I’m still so new at this lichen thing that I do not always notice the finer differences between similar looking species:( I hope you will both keep me on my toes as I learn how to “look beyond the superficial details.”

Yes, I think you’re right, Jason
By: Jason Hollinger (jason)
2017-07-08 14:01:50 PDT (-0700)

I’ll bet there are multiple things here on rock, too.

I’m wondering if its multiple species on rock
By: J-Dar
2017-07-08 13:50:54 PDT (-0700)

in addition to the bark ones. A few shots have nice black prothallus, but not all of them. We could keep guessing till the cows come home!

I don’t think these are Lecidea tessellata
By: Jason Hollinger (jason)
2017-07-08 13:19:22 PDT (-0700)

The apothecia of that species should be more angular because they are immersed between areoles. My guess would be Buellia spuria (quite common in the Ozarks region). But I wouldn’t rule out Rhizocarpon or Porpidia. (Although the thallus seems to white for either.)

(The close-up — photo #5 — really shows it best: immersed apothecia with black rims still retaining some remnants of the thallus.)

Wow, where to start…
By: Jason Hollinger (jason)
2017-07-08 13:15:47 PDT (-0700)

I hope you’re ready for this!

So the last photos are not on rock — sneaky of you! They are almost certainly Buellia stillingiana or possibly B. curtisii (depending on spore size and shape).

The others… Okay, so none of these are Verrucaria. You’ve got to look closely at the details of the ascomata to tell, the gestalt won’t do here. In each case the ascomata are clearly dilated, forming disks, so these are apothecia not perithecia.

This is a very difficult group of unrelated lichens, these crusts with black “lecideine” apothecia. That is, black disks with black rims. Options include Lecidea, Buellia, Porpidia, Rhizoplaca and many others besides. Much depends on the spores (respectively: simple and colorless, septate and dark, simple and colorless but with a gelatinous halo around them, and finally septate and usually dark and also with a gelatinous halo). Many can look superficially identical. With time and lots of work, you can definitely get to know your local flora well enough to be able to make good guesses based on texture, color, substrate, habitat and other superifical clues. … But my guesses would be close to useless in your area! Just a fun game of chance.

Hi Judi
By: J-Dar
2017-07-08 13:09:20 PDT (-0700)

A couple of your shots look like good examples of Lecidea tessellata. Of course, there are likely other possibilities too. The close up pics show nicely that the fruiting bodies are apothecia rather than perethecia like Verrucaria have.

Are the last couple of shots on bark? If so, those would be different.

Created: 2017-07-08 12:23:49 PDT (-0700)
Last modified: 2017-07-08 13:51:13 PDT (-0700)
Viewed: 44 times, last viewed: 2019-08-20 10:56:01 PDT (-0700)
Show Log