Observation 65552: Lecanora Ach.

When: 2011-04-15

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

Who: Byrain

No specimen available

Growing on living Celtis sinensis (Chinese Hackberry) bark, all pictures are from one tree. There were many spots like this scattered across the bark, most too high up to take pictures of.


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Crust with rimmed apothecia
By: Jason Hollinger (jason)
2011-04-16 12:46:03 JST (+0900)

Meaning apothecia whose rim is the same color as the crust (but different from the disk) — so-called “thalline rim”. This means the rim of the apothecium has algae in it. This narrows it down to a few genera:

red disk — Haematomma
orange disk — Caloplaca
black disk — Rinodina
brown to gray to yellow to greenish disk (i.e., the rest!) — Lecanora

Of course there are always others, e.g., really thick rims are generally Ochrolechia, there’s orange-rimmed jobbies in the tropics, Brigantiaea, Letrouitia, etc. But those four are the common ones, or at least the commonly-noticed ones.

For kicks I picked up the Sonoran key to Lecanora, but quickly realized there were several pages of species which differ primarily in microscopic and chemical features, promptly laughed pitifully and pretended it never happened. Need a compound scope with polarizing filters even to get to first base on these.