When: 2018-07-04

Collection location: Miramar Lake, San Diego, California, USA [Click for map]

Who: Cindy Trubovitz (Trubo)

Specimen available

Notes:
Growing on soil along a steep bank among eucalyptus trees. Some cupped podetia present with soredia inside and outside.

Images

Proposed Names

61% (2)
Used references: I have a previous observation: https://mushroomobserver.org/...

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= Observer’s choice
= Current consensus

Comments

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Yeah, spot tests are very difficult on this group
By: Jason Hollinger (jason)
2018-10-03 16:40:08 EDT (-0400)

The quantities of substances (e.g., atranorin in nashii) are pretty low to start with, and the K+y is complicated by the K+ brown-red of fumarprotocetraric.

If you happen to have a good UV lamp (±350 nm, not the UV LED flashlights used to look for scorpions in the desert, those are too long wavelength), then you can check for a subtle UV+y after applying a small amount of NaOH or KOH… and let it dry thoroughly before checking UV. Atranorin is the only substance I have found that gives a UV+y after K. But again, other substances can interfere; they often cause UV to quench after KOH, so the fumarprotocetraric will tend to cancel the "KUV"+y from atranorin.

There’s no winning with Cladonia. Sometimes you just have to resort to TLC or HPLC to be confident.

Thanks for noting other species
By: Cindy Trubovitz (Trubo)
2018-10-03 15:52:25 EDT (-0400)

The characteristics and substrate are remarkably similar to those species. I tried applying NaOH to the cups but they didn’t appear to turn yellow but I want to try again with fresher specimens to see if that makes a difference. Yeah, IMO I would vote for C. hammeri. Thanks Jason!

Probably the best we can do
By: Jason Hollinger (jason)
2018-09-30 16:45:05 EDT (-0400)

I’ll bet this is C. nashii or C. hammeri but there’s really no way to be confident without doing TLC.

Created: 2018-09-30 15:49:40 EDT (-0400)
Last modified: 2018-10-03 16:40:09 EDT (-0400)
Viewed: 31 times, last viewed: 2019-07-05 04:22:04 EDT (-0400)
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