Observation 73511: Lepraria Ach.

on Quercus suber (cork tree).

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Proposed Names

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Recognized by sight
58% (1)
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Recognized by sight: thanks Jason!

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Too many methods
By: Jason Hollinger (jason)
2011-08-19 01:23:59 CEST (+0200)

(Loving the Fungal Boogie…)

I’m too lazy to do the extracts generally, but a good compromise for problematic specimens, lying somewhere between acetone extract and needles, is sticking a fragment on a piece of toilet paper or kleenex and applying your reagents there. K in particular will usually bleed out and show up nicely on the paper. Useful for Bryoria in particular where the dark brown/black melanins hide reactions pretty effectively.

The problem you’re running up against here is water by itself will make the fungal hyphae transparent bringing out the green of the algae. So your K+ yellow-green is probably K+ yellow with the algae just confusing the results a bit. K+y Lepraria is fairly common throughout, and unfortunately is probably the least helpful result in terms of actually reaching a species name. Probably has atranorin. Could be several species, I think, meaning you’ll need TLC, sigh.

By: Danny Newman (myxomop)
2011-08-09 05:25:14 CEST (+0200)

and specific to sterile crusts, no less. i smell a compilation:


in Lepraria news:

K+. yellow to yellow/green.

still hunting down a UV light. I wish you could have seen the look on this smoke shop clerk’s face as I stood on a milk crate and held my piece of cork tree bark up to the black light in his entryway. I told him I’d be back when the sun went down.

is there a method to this spot test madness? i’ve read about acetone extraction, but for the meantime I’m just poking at the thallus(/hypothallus?) with a reagent-soaked needle.

I’ll hold him down…
By: Jason Hollinger (jason)
2011-08-08 08:45:21 CEST (+0200)

Welcome to the fun-filled world of sterile crustose lichens! Here’s a more positive take on the group: Man It Feels Good 2 B a Lichen.mp3

(For whatever it’s worth, xanthones generally fluoresce nicely in 350 nm UV, even without Dimroth’s solution. You have one of those lying about, don’t you?)

By: Danny Newman (myxomop)
2011-08-08 06:27:28 CEST (+0200)

calls for Dimroth’s Sollution as well


this lichen is getting expensive.

Preliminary Keys to Lepraria s.l. in North America
By: Danny Newman (myxomop)
2011-08-08 06:05:11 CEST (+0200)

“This key is meant for use with specimens that have been analyzed with Thin Layer Chromatography.”

just when my Thin Layer Chromatograph is in the shop, I have to go and get this troublemaker.

Following this:


for spot tests. I’ll post back with any findings.

By: Jason Hollinger (jason)
2011-08-08 03:20:18 CEST (+0200)

Genus is certain (at least until the break it up into multiple genera again, this time hopefully correctly!), but I don’t know the eastern species very well, let alone the western. I’d refer you to either the Sonoran Flora (vol. III, pp. 384-388), or James Lendemer’s working key. Good luck!

Created: 2011-08-07 12:41:42 CEST (+0200)
Last modified: 2011-08-08 06:22:07 CEST (+0200)
Viewed: 151 times, last viewed: 2017-06-10 01:44:44 CEST (+0200)
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