Observation 65935: Leptogium arsenei Sierk

On mossy steep outcrop in northern gully, with other Leptogium and Phaeophyscia hispidula.

L. austroamericanum is apparently very similar, but has cylindrical isidia even right from the start(??) L. arsenei is allegedly more common in dry interior regions.

Species Lists


thallus at 10x
wrinkly lobe surface at 30x
young granular isidia at 30x
wrinkles more pronounced below, at 30x
older globular isidia at 30x
old globular isidia at 30x
isidia along margin at 30x (sort of shows thickness)

Proposed Names

87% (1)
Recognized by sight: thicker lobes than L. cyanescens, minutely wrinkled (at magnification), isidia granular
Used references: Lichen Flora of the Greater Sonoran Desert Region, Vol. II, 2004 (treatment by Jørgensen and Nash III)

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= Observer’s choice
= Current consensus


Add Comment
Terrific series from the Santa Fe trails, Jason!
By: Chris Parrish (kitparrish)
2011-04-22 21:55:31 EDT (-0400)

I wasn’t even thinking of stacks … just grooving on the sensation of scuba diving among all those isidia, soredia, and special doodads to be found on the surfaces of these lichens at about 30x under the microscope.

Already thrown away the originals for these
By: Jason Hollinger (jason)
2011-04-22 20:17:57 EDT (-0400)

But look at any of my old 30x photos, like this one:

I’ll post some before and afters next batch. Chris Parrish might have some examples, already, from when we were first experimenting with it last year.

By: Martin Livezey (MLivezey)
2011-04-22 19:38:30 EDT (-0400)

Sounds labor intensive but the photos are beautiful! Could you post one for comparison that is not stacked?

Photo stacking through dissecting scope
By: Jason Hollinger (jason)
2011-04-22 19:21:57 EDT (-0400)

I’ve got a photo of my ultra-high-tech setup on my summary page. I use CombineZP to combine 20-30 photos for each image. Time-consuming (mostly for the computer, though, not for me!), but the results — if I can prevent vibrations or drafts from moving the subject in the middle of a shoot — can be very nice. Still don’t get sharp details all the way down to the full resolution of the camera, but I learned a trick: reduce from 3600×2700 to 2000×1500 first then stack, and the results are much nicer, somewhat counter-intuitively. I’ll take something like 1000 photos one evening, then batch-reduce all the images and divide them into subfolders, then start a CombineZP batch job on all of them on my old (spare) laptop. Few days later, after it finally finishes, it’s like Christmas. :)

Beautiful shots!
By: Tim Sage (NMNR)
2011-04-22 18:36:43 EDT (-0400)

What is your set-up?

Created: 2011-04-22 18:32:21 EDT (-0400)
Last modified: 2011-04-22 18:32:23 EDT (-0400)
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