Observation 67699: Caloplaca Th. Fr.
When: 2011-04-22
Collection location: Davis, California, USA [Click for map]
Who: Byrain
No specimen available
Notes:
Growing on the sidewalk in front of my house, lichens like this are rather common in this habitat around here.
Images
| User’s votes are weighted by their contribution to the site (log10 contribution). In addition, the user who created the observation gets an extra vote. | |||||||||
| Vote | Score | Weight | Users | ||||||
|---|---|---|---|---|---|---|---|---|---|
| I’d Call It That | 3.0 | 0.00 | 0 | ||||||
| Promising | 2.0 | 0.00 | 0 | ||||||
| Could Be | 1.0 | 5.76 | 1 | (Byrain) | |||||
| Doubtful | -1.0 | 0.00 | 0 | ||||||
| Not Likely | -2.0 | 0.00 | 0 | ||||||
| As If! | -3.0 | 0.00 | 0 | ||||||
| Overall Score sum(score * weight) / (total weight + 1) |
0.85 | 28.40% | |||||||
The other one has a thin yellowish thallus visible, I’d say. This one has no visible thallus (all that’s visible is the apothecia). Could be C. arenaria or one of several similar species. According to the photos in Lichens of North America, arenaria has very reddish apothecia. I have no idea if that is typical or required.
Definitive ID requires careful observation of the spores (size and width of septum), paraphyses (number of round inflated cells at the tips in particular), and sometimes details about the rim and exciple (I’m not so clear on all this yet).