Observation 202652: Rinodina

When: 2015-04-11

Collection location: Sintra, Portugal [Click for map]

Who: zaca

No specimen available

To the naked eye it looks like a Rhizocarpon with white convex to globose areolas and black prothallus. Magnifying the photos one can see that in many of the specimens the areolas “produce” very tiny apothecia, but not black as is usual in that genus, some light coloured red brown. So, Rhizocarpon can be ruled out. Trying to get some hint about what it is, I crush some of the tiny apothecia. Firstly I could only see that the photobiont is a green alga of trebouxia type and no trace of a hymenium. Finally, I saw something that appears to be part of an hymenium and there I saw a bluish spore (non-sepate, with two oil drops inside), some non-fruitful asci and an ascus with some one septate brown spores inside. This brings Rhizocarpon to the scenario again? Or, what is this?
Let me add that the chemistry is also unusual: C+ orange/red, K+ yellowish, KC+ red.


Chemical reactions.
Microscopy page;
Comparison of observations.

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Add Comment
New interpretation of data.
By: zaca
2016-04-10 13:57:58 CEST (+0200)

I was looking for the files of the microscopy of these specimens and, fortunately, I still had them. I just uploaded a set of photos. It is now clear to me (not at the time I observed) that the spores are those of a Rinodina and, more precisely, the spores are of the so-called Pachysporaria-type. This conclusion together with recent knowledge about my Rinodina observations (see, for instance, observation 236227 and observation 236229) lead me to the impression that this must also be a species in the same complex (of R. aspersa and R. atrocinerea) since there are many features in common, namely:
- The overall appearance is similar;
- Thallus surrounded by a black prothallus;
- Whitish to light coloured areolas, more dense and flat in observation 236227 and sparse and rounded in this and observation 236229;
- Similar chemistry (didn’t test the one in observation 236229 but I’m assuming that it corresponds to R. aspersa);
- Similar spores of this one and that in observation 236227; The one in observation 236229 is sterile.
It happens that the specimens in this observation, having rounded areolas, these areolas give rise to apothecia (1 per areola) with light coloured discs. This contrasts with the dark discs observed in observation 236227 (R. atrocinerea). On the other hand, the rounded areolas of the specimen in observation 236229 (R. aspersa) broke into soralia and soredia.
For better comparison, I also uploaded a photo with specimens in the three observations
Thus “only need” the correct epithet for these specimens, since the genus seems to be Rinodina.

Created: 2015-04-11 21:17:45 CEST (+0200)
Last modified: 2016-04-10 13:58:18 CEST (+0200)
Viewed: 39 times, last viewed: 2017-06-20 08:08:01 CEST (+0200)
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