Observation 47766: Diplotomma Flotow
When: 2010-06-26
Collection location: Sintra, Portugal [Click for map]
Who: zaca
No herbarium specimen

Notes: In the same day I found three specimens of the same species. Here I use only photos from the bigger one.
First I thought that this specimens should belong to the genus Lecanora. However, I was not able to find any of its species in which the color (black) of the fruits is the same at the disc and at the margin. Aparently, this feature can be realized in the genus Diplotomma, that I’m proposing.

Proposed Names

29% (1)
Eye3 Eyes3
Used references: Besides MO the following databases where used:
www.nhm.uio.no/botanisk/lav, www.stridvall.se/lichens/gallery, www.sharnoffphotos.com/lichens

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Jason, your response was not negative,
By: zaca
2010-06-29 08:56:40 CDT (-0400)

but I was too hopeful with my proposal. I did not realize there was so much diversity of lichens with those features. Serves as a warning for the future. Thank you for the explanations.

“lecideine” crust
By: Jason Hollinger (jason)
2010-06-28 15:48:50 CDT (-0400)

I hate to be negative, but there are a vast number of genera with black-rimmed, black apothecia. The three basic types are (roughly):

lecanorine — rim same color as thallus, disc any color
lecideine — rim and disc both black
biatorine — rim and disc both same color but not black

Some representative genera:

lecanorine: Lecanora, Rinodina, Ochrolechia, Tephromela, Haematomma
lecideine: Lecidea, Porpidia, Rhizocarpon, Sarcogyne, _Buellia, Micarea
biatorine: Biatora, Bacidia, Pyrrhospora, Mycobilimbia

But there are many more of each, especially the lecideine genera. And some genera (like Lecanora!) have multiple types. And some like Mycoblastus are black and look lecideine but are actually biatorine (because the rim is soft, not carbonized, and actually not black when seen under a compound microscope). It gets very complicated.

In short, microscope is required to get anywhere on unknown crustose lichens.

Created: 2010-06-28 12:38:23 CDT (-0400)
Last modified: 2010-06-28 12:38:27 CDT (-0400)
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