Observation 75511: Nephroma laevigatum Ach.
When: 2011-09-04
Who: zaca
No herbarium specimen

Notes: This fertile specimen was found after the one considered in MO75509, that one with no apothecia.
An unexpect feature of the apothecia in this species is that they are visible only from the underside (see the photo that follows the chemical reactions).
The 3-septate spores and the values obtained for the dimensions of the spores (although a bit shorter than expected, maybe due to a local variation) seems to confirm that the species is Nephroma laevigatum, according to description presented in Macrolichens of the Pygmy Forest and the photos in azoresbioportal.
Average dimensions of the spores:
Me = 16.5 × 5.9 µm ; Qe = 2.8 (N=40).

Images

166605
166606
166607
The habitat.
166608
Underside and chemical reactions.
166609
Views of apothecia.
166610
Microscopy – I.
166611
Microscopy – II.

Proposed Names

58% (1)
Eye3 Eyes3
Based on microscopic features
Based on chemical features

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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You’re right
By: Jason Hollinger (jason)
2011-09-05 19:35:37 EDT (-0400)

The species with pale yellow medulla can be very hard to capture on film. The position of the apothecia is the key character for the genus. It’s the only one that does that. (Nice photos, as usual.)

It is very difficult …
By: zaca
2011-09-05 19:24:38 EDT (-0400)

to describe the color of medulla. Let’s say that is pale yellowish. The wine red reaction to K can be seen in the photo of the chemical reactions.
The most strange thing to me are the bizarre apothecia.

Medulla yellow?
By: Jason Hollinger (jason)
2011-09-05 19:00:51 EDT (-0400)

I knew I’d heard of N. laevigata somewhere. It’s supposed to have a yellow medulla which reacts K+ wine-red where pigmented. Did you observe this?

Never looked at spores of a Nephroma before!
By: Jason Hollinger (jason)
2011-09-05 18:58:43 EDT (-0400)

Created: 2011-09-05 18:51:42 EDT (-0400)
Last modified: 2011-09-05 18:54:38 EDT (-0400)
Viewed: 36 times, last viewed: 2016-10-25 11:28:15 EDT (-0400)
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