Observation 102729: Buellia disciformis (Fr.) Mudd
When: 2012-07-22
Who: zaca
No herbarium specimen

Notes: This specimen agrees very well with the macro description given in CNALH for Buellia disciformis. The 8-spored asci and 1-septate spores with average dimensions of Me = 16.7 × 6.5 µm ; Qe = 2.6 (N=25) also fall within the values given there, though a bit shorter. It should also be mentioned that I observed some “apparently” 3-septate (i.e. with two additional false septa) spores, fact that is referred in CNALH to occur occasionally. However, The photo presented there and contrary to the description given for the surface: “pale white to ivory, dull, smooth, epruinose, phenocorticate, esorediate” shows a greenish thallus; Nevertheless, in the 1st photo of Sharnoff photos a specimen similar to mine is shown (the 2nd is the one used in CNALH). Also Irish lichens presents a photo similar to mine, but also refers bigger spores. According to CNALH the similar B. ochroleuca has a granular and darker thallus and slightly bigger spores; B. erubescens is also referred to be similar but has smaller spores and different shaped (broadly ellipsoid).

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Add Comment
But …
By: zaca
2012-07-26 19:46:23 CDT (-0400)

B hyperbolica is a somewhat diferent species (see this photo at Wales-lichens) and, moreover it is a rare species (at least in UK).
About the “inspersed hymenium” it is a difficult task, at least for beginners. What I remember from the microscopy of this specimen is that the sections were particularly bad to observe and, as a consequence, I took no photos of them.

Might not be important in this case
By: Jason Hollinger (jason)
2012-07-26 19:21:00 CDT (-0400)

British Flora claims there is only one other epiphytic species with spores that size: B. hyperbolica. It does not have an inspersed hymenium like (B. disciformis does), and it has ±atranorin and fumarprotocetraric (K± yellow/brown, P+ orange/red). So the best discriminant is presence or lack of oil drops in hymenium, not chemistry. (Of course, that’s a character I don’t know how to read yet!)

I´ll do the spot test,
By: zaca
2012-07-26 18:31:45 CDT (-0400)

if I can find it again.

That makes sense
By: Jason Hollinger (jason)
2012-07-26 17:09:33 CDT (-0400)

I thought it was odd you didn’t report the spot tests!

Yes, but …
By: zaca
2012-07-26 16:36:45 CDT (-0400)

the sample fly (literally) from my window when I intended to make the chemical tests that I didn’t made “in loco”.

It’s worth doing the K test
By: Jason Hollinger (jason)
2012-07-26 15:13:44 CDT (-0400)

Buellia is a very large genus with diverse chemistry. It’s always worth verifying the chemistry. B. disciformis should be K+y from atranorin (plus traces of lots of other things).

Created: 2012-07-25 14:02:51 CDT (-0400)
Last modified: 2012-07-25 14:02:53 CDT (-0400)
Viewed: 83 times, last viewed: 2016-10-24 01:45:22 CDT (-0400)
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