Collection location: Serra de São Mamede, Portugal [Click for map]
This is another lichen mysterious to me. The intense K+ purple reaction suggests a species of the genus Caloplaca or closer, but I could not find anything similar there. On the other hand, in Stridvall I found a species of Rinodina (R.interpolata) whose appearance is similar. However, in this genus could not find any species with such a chemical reaction. As one says, “I watch passing ships”.
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Half the time comments are intended to inform decisions you make the next time you see something like it! Now you know better what sorts of observations will be necessary to get to the bottom of dark crusts with black lecanorine apothecia. Same thing with the comment I posted about your Lecidea. The point is not to discourage (far from it!), it’s just to give you a realistic idea of how confident of an id you can expect. With black lecideoid crusts, you (and me too!) are limited to iding by photo, because the technical characters aren’t readable without equipment we don’t have. That’s worthwhile information to have. If you have a wide variety of lichens at some location, but limited time, better to choose the non-lecideoid crusts! :)
(I’m guessing “I watch passing ships” must be a Portuguese turn of phrase. Does it mean “all I can do is watch” or something like that?)
I didn’t collect any material from this specimen. Thanks anyway, Jason.
I always start with Rinodina on things like this, too, but who knows? According to Sheard in Sonoran Flora, they can only have at most atranorin (K+ weak yellow) in the cortex, but they can have all sorts of things in the medulla, including anthraquinones (K+ intense red or purple). The key, however, doesn’t mention any K+ violet species (and there are too many to check each one!)
If the spores are brown and 1-septate, then almost certainly Rinodina.
If the spores are simple and colorless then see key below.
If the spores are otherwise… the generic keys in the Sonoran Flora don’t help us much, since all we know is that this has black lecanorine apothecia.
1a. thallus or apothecia yellow… (not us)
1b. thallus and apothecia not yellow . . . 2
3a. spores warty, cephalodia present, squamulose… (Psoroma, not us)
3b. spores smooth, etc. . . . 4
5a. spores curved . . . Harpidium (?)
5b. spores ellipsoid or globose . . . 6
6a. hymenium violet-red or brown . . . Tephromela
6b. hymenium colorless . . . 7
7a. thallus not brown, or if brown then apothecia densely pruinose . . . Lecanora
7b. thallus and apothecia brown and not pruinose . . . 8