Observation 216995: Caloplaca Th. Fr.
When: 2015-09-26
Who: zaca
No herbarium specimen

Notes: A pair of lichens grew on a small piece of soil and dust over calcareous rock placed in the intertidal zone; the rock becoming half submersed at the higher level of the sea (see the photo of the habitat).

This observation refers to the yellow (maybe also with some orange) one in the photos. A closer look to the photos reveals that (for instance on the left of the first one) it has some orangish apothecia. This is a strange grow form for a Caloplaca, the genus which I think it belongs to, since it reacts K+ purple-red as shown in one of the photos. Alternatively it could be a Xanthoria, which would be more in accordance to the form of the lobes, but the apothecia is different in the latter genus.
The yellowish lichen overgrow another lichen whose thallus is not visible but has relatively big brown squamulas, to be considered at another observation. I don’t know it there is any parasitism envolved, though it seems.

Images

559299
Microscopy: Section in KOH, asci (one in melzer) and alga.
558779
558780
558781
Reaction to KOH on the lobes.
558802
Habitat.

Proposed Names

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Recognized by sight
86% (1)
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Comments

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Microscopy added; Caloplaca confirmed.
By: zaca
2015-09-28 11:21:01 PDT (-0700)

Created: 2015-09-26 16:14:52 PDT (-0700)
Last modified: 2015-09-28 12:32:09 PDT (-0700)
Viewed: 38 times, last viewed: 2016-01-13 02:38:30 PST (-0800)
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