Observation 97597: Fulgensia fulgens (Sw.) Elenkin
When: 2012-06-16
Who: zaca
No herbarium specimen

Notes: An isolated specimen with a bit less than 2 cm in diameter growing on the soil existent on the top of calcareous rocks.
This is the first time I found a Fulgensia. Regarding the species I think that it belongs to one of the following: F. desertorum or F. fulgens.
According to 1 the main macroscopic difference between the two species is the existence of schizidia in the thallus of the former while it is absent in the latter. However, in 2 it is said about the 2nd of these species “with surface at the centre forming flake-like shizidia that break away to expose the white medulla”. On the other hand, the pictures presented 1 do not have sufficient detail to be conclusive. It seems to me that my specimen has both pruina and schizidia.
I was not able to find reference to the results of the spot tests, but the existence of anthraquinone pigments in the species of this genus makes the result plausible.
Finally, no species of this genus is mentioned in the portuguese checklist.

Images

228602
228603
228604
Chemical reactions.
229243
A1-4: Asci; M1-2: Reaction to Melzer; S1-2: Sections – S1 refers to an apothecium with the red marks on the thaline margin of K reaction as a result of the spot tests, S2 – a prior aplication of K in the preparation.

Proposed Names

29% (1)
Used references: 1 CNALH, 2 lastdragon.
Based on chemical features
58% (1)
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Recognized by sight

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Comments

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Yes, it look very much like
By: zaca
2012-06-21 18:18:03 CDT (-0400)

Fulgensia fulgens.
Thanks, Jason, for your opinion.

This is definitely Fulgensia
By: Jason Hollinger (jason)
2012-06-20 02:49:42 CDT (-0400)

But I find the genus very difficult. Septation of the spores doesn’t seem to be 100% reliable. The British Flora claims (contrary to the Sonoran Flora) that F. fulgens can have septate spores (though usually doesn’t). Spore size is the same throughout the species we’re considering.

I think we have to rely on the morphological differences: F. fulgens is monophyllous with distinct marginal lobes; F. desertorum and F. bracteata are formed of dispersed areoles with no well-developed marginal lobes. The photos of F. fulgens on lastdragon are superb. If that is what they consider “well-developed marginal lobes” in this genus, then I’d say yours is a clear match. Certainly yours is not diffuse: it is one solid continuous mass.

Microscopy added.
By: zaca
2012-06-19 14:31:14 CDT (-0400)

As was able to see very few spores and I not sure if they are septate or not, though they seem to be. The dimension where approximately of 12 × 3.7 micron.

Created: 2012-06-17 05:10:55 CDT (-0400)
Last modified: 2012-06-21 18:19:01 CDT (-0400)
Viewed: 61 times, last viewed: 2016-10-23 21:15:37 CDT (-0400)
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