Observation 360878: Lecidella Körber

When: 2019-03-02

Collection location: Serra da Estrela-Parte Sul, Portugal [Click for map]

Who: zaca

No specimen available

Images

Microscopy: Apothecial section in water (x100);
Microscopy: Hymenium views in congo red in water (x400);
Microscopy: Paraphyses and asci in congo red (x1000);
Microscopy: Asci tips in IKI;

Proposed Names

29% (1)
Recognized by sight
58% (1)
Based on microscopic features: I see no other possibility.

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= Observer’s choice
= Current consensus

Comments

Add Comment
Thanks, Jason, for the synthesis about the Lecidella type ascus.
By: zaca
2019-03-17 01:06:01 CST (+0800)

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.

Interesting
By: Jason Hollinger (jason)
2019-03-17 00:30:13 CST (+0800)

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Bruce Ryan does in his unpublished keys, too (pre-2000 most likely).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 never saw in Lecidella a so big apical beak …
By: zaca
2019-03-16 19:37:09 CST (+0800)

both in high and in width. I always interpreted their asci as Lecanora-type, though a small salience can exist at the bottom of the tholus. This specimen in particular seems very much like L asema.

Isn’t lecidella-type ascus somewhere between lecanora- and bacidia-type?
By: Jason Hollinger (jason)
2019-03-16 08:27:47 CST (+0800)

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?

Microscopy added.
By: zaca
2019-03-10 06:25:11 CST (+0800)

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.