Observation 67997: Caloplaca Th. Fr.
When: 2011-05-23
Collection location: Old Bridge North of Solano Park Circle, Davis, California, USA [Click for map]
Who: Byrain
No specimen available
Notes:
Growing on a stone bridge with several other lichen species and moss. A creek regularly visited by waterfowl and other animals runs underneath it.
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% | |||||||
| 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 | 5.45 | 1 | (jason) | |||||
| Could Be | 1.0 | 0.00 | 0 | ||||||
| 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) |
1.69 | 56.34% | |||||||
The white crust goes with the orange apothecia in first photo and left side of second photo; the right side of the second photo it looks like another species of Caloplaca this time without any thallus showing above the surface of the rock.
It’s possible you could narrow down the possibilities based on the texture of the crust and rims of the apothecia, but I don’t have time right now to go through the key. It’s a large and difficult genus, typically requiring microscopy to be sure.