Observation 99940: Dirina ceratoniae (Ach.) Fr.

When: 2012-07-07

Collection location: Peniche, Portugal [Click for map]

Who: zaca

No specimen available

This was a(nother) big surprise. These specimens grew on the shrubs envolving the place of my previous observation of Dirina massiliensis (see observation 99463). In the field I thought that could be some Ochrolechia sp.. However, the similarity of the apothecia with D. massiliensis was such that make me wonder if it was the same or a closed related species. It is convenient to recall that D. massiliensis grows (only) on rock and that the thallus of these specimens living on shrubs is greyish-green with a whitish prothallus, darker in young specimens. The spot tests where also very similar to those obtained with D. massiliensis. But many Ochrolechia sp. can have such C+ and KC+ red reactions.
Looking for more information about Dirina spp. I found a species that I think must be the one to which these specimens belong: D. ceratoniae. Unfortunately I could not find a good description of it but I found plenty of photographs, available at the following links:
dbiodbs, lenaturalist, biodiversidadvirtual (at the bottom of the page one can have access to the other specimens in the database).
The world distribution of this species is confined to Mediterranean countries: Spain, Greece, Morocco, Turkey, France, Italy.
Finally, having my bad microscope “back to life” I made the microscopy, which completely rules out Ochrolechia and confirms the similarity with Dirina massilliensis. In particular, the spores are hialine, fusiform mostly encurved, 3-septate.


Chemical reactions;
The young ones;
Detail of a young one.

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Great work!
By: Jason Hollinger (jason)
2012-07-10 15:03:19 CDT (-0500)

This is a good one, by the way, to practice recognizing Trentepohlia.

Created: 2012-07-10 13:56:01 CDT (-0500)
Last modified: 2012-07-10 13:56:02 CDT (-0500)
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