Observation 277582: Lecanora confusa Almb.

When: 2017-05-11

Collection location: Santa Barbara Co., California, USA [Click for map]

Who: J-Dar

Specimen available

On a wood fence in coastal bluff scrub habitat


Polarized light showing crystals in epihymenium
Spot tests showing UV reaction

Proposed Names

28% (1)
Recognized by sight
57% (1)
Used references: Sonoran Flora and B. Ryan unpublished keys
Based on microscopic features: Spore width
Based on chemical features: C+O

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= Observer’s choice
= Current consensus


Add Comment
Yeah, these are hard to characterize
By: Jason Hollinger (jason)
2017-06-28 15:59:47 CDT (-0500)

I personally refuse to call them truly sorediate — I never see any piles of well-formed granules sitting on the thallus. Instead it’s more eroding / scurfy / weakly corticate / verruculose. But the Sonoran Flora says that it can develop poorly-delimited sorediate patches or become entirely leprose. I’m not seeing it myself.

Would you call this sorediate
By: J-Dar
2017-06-28 15:44:55 CDT (-0500)

Or just granular? Or?

Another good source for usnic Lecanora is:
By: Jason Hollinger (jason)
2017-06-28 12:14:00 CDT (-0500)

Śliwa, L. & C.M. Wetmore. 2000. Notes on the Lecanora varia group in North America. The Bryologist 103(3): 475-492.

Micro Update and UV Photos
By: J-Dar
2017-06-28 10:13:43 CDT (-0500)

Thallus light green, granular to areolate, consistent with Ryan’s description “forming small discrete patches”. Apothecia about 0.5mm, deeply set, young with granular warty thalline margin with scattered algal cells, initially somewhat flexuous with a thick margin, becoming strongly flexuous to convoluted, with the margin turning back and becoming partially excluded. Margin always warty granular pseudosorediate? Disk pale to yellowis-orange, slightly pruinose. Spot tests at 20x seem to show C+O and K+Y, KC+Y, notably only where the smallest amount of regeant was placed, otherwise the cortex gets burned off. In UV, the C+ shows as dark orange, but barely registering, the K shows as light yellow, and the KC shows as darker yellow. Hymenium and hypothecium hyaline POL- (without crystals), epihymenium brown, with small crystals POL+, crystals and pigments soluble in K.

Spores hyaline, simple, ellipsoid. Average 12.1×4.4 (n=5).

Created: 2017-05-29 09:21:16 CDT (-0500)
Last modified: 2017-06-28 10:14:08 CDT (-0500)
Viewed: 70 times, last viewed: 2019-08-12 23:52:10 CDT (-0500)
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