When: 2019-03-02
Collection location: Serra da Estrela-Parte Sul, Portugal [Click for map]
Who: zaca
Images
| User’s votes are weighted by their contribution to the site (log10 contribution). In addition, the user who created the observation gets an extra vote. | |||||||||
| Vote | Score | Weight | Users | ||||||
|---|---|---|---|---|---|---|---|---|---|
| I’d Call It That | 3.0 | 0.00 | 0 | ||||||
| Promising | 2.0 | 0.00 | 0 | ||||||
| Could Be | 1.0 | 6.55 | 1 | (zaca) | |||||
| Doubtful | -1.0 | 0.00 | 0 | ||||||
| Not Likely | -2.0 | 0.00 | 0 | ||||||
| As If! | -3.0 | 0.00 | 0 | ||||||
| Overall Score sum(score * weight) / (total weight + 1) |
0.87 | 28.92% | |||||||
| User’s votes are weighted by their contribution to the site (log10 contribution). In addition, the user who created the observation gets an extra vote. | |||||||||
| Vote | Score | Weight | Users | ||||||
|---|---|---|---|---|---|---|---|---|---|
| I’d Call It That | 3.0 | 0.00 | 0 | ||||||
| Promising | 2.0 | 6.55 | 1 | (zaca) | |||||
| Could Be | 1.0 | 0.00 | 0 | ||||||
| Doubtful | -1.0 | 0.00 | 0 | ||||||
| Not Likely | -2.0 | 0.00 | 0 | ||||||
| As If! | -3.0 | 0.00 | 0 | ||||||
| Overall Score sum(score * weight) / (total weight + 1) |
1.73 | 57.83% | |||||||
Comments
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I personally see greater variation in Lecidella ascus type. But then, my ascus stains aren’t nearly as good as yours(!)
Just for amusement value, here’s what Knoph & Leuckert (2004) say in the intro to the Lecidella treatment in the Sonoran Flora: “The genus can be determined (easily) by the ascus-type, because the Lecidella-ascus is so far only known from this genus.” They describe it as “lecanoral, with a thickened wall apically, amyloid at the apex; tholus amyloid and with narrow, axial body convergent towards apex”.
Bruce McCune (2017) describes it thus: “thick I+B wall, a thick I+B tholus, and narrow axial body (Lecidella-type)”. By comparison, he describes Lecanora as “ascus tip with K/I+B wall, thick K/I+b dome and a K/I- apical cushion”.
The British Flora just claims Lecidella has a Lecanora-type ascus(!)
Interestingly, Knoph & Leuckert 1994 (saxicolous species of the genus_Lecidella_ in America, Nova Hedwigia 59(3-4): 455-508) also consider the ascus Lecanora-type. I’m not sure when they changed their mind.
Bruce Ryan does in his unpublished keys, too (pre-2000 most likely).
Lastly, Curtis Björk describes it as “asci clavate, with a thickened, IKI+ medium blue tholus with a narrow axial mass that narrows near the tip” (see https://www.waysofenlichenment.net/...).
I’ve struggled to get an explicit description of how lecidella-type differs from lecanora-type, but I think it has a blue layer above the axial canal. I agree that yours look like perfectly good bacidia-type. But maybe that’s within range of variation for some species of Lecidella?
Everything points to Lecidella, except that the asci do not seem to be of Lecanora type. In fact, looking to the photo with the asci tips in IKI, it seems that there is a prononced apical beak, making it closer to Bacidia- or Biatora-type than Lecanora-type.
Even the people very familiar with the IKI test sometimes do not agree and seem to lead to some confusion. Maybe this time I looked differently to the stain because of a lower concentration of the lugol than usually.