Observation 62974: Leptogium cyanescens (Rabenh.) Körber
When: 2010-03-14
No herbarium specimen

Proposed Names

45% (2)
Recognized by sight
91% (2)
Eye3 Eyes3
Based on microscopic features: no wrinkles as L.austroamericanum. See lobes on the bottom of second pic.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Jason Hollinger (jason)
2015-04-16 19:54:40 BST (+0100)

Thanks for bringing this back up, too. I’ve seen L. austroamericanum a few times since this observation, and I think we can rule it out based on color alone. Still don’t know L. dactylinum, but I don’t think it’s such a big species. I’m comfortable calling this L. cyanescens now.

Not many choices
By: Jason Hollinger (jason)
2011-02-01 02:04:28 GMT (+0000)

I think thin, bluish-gray Leptogium with isidia and/or lobules in the southeast (without white tomentum underneath) are one of three species:

L. cyanescens — extremely variable
L. austroamericanum — should have minutely wrinkly surface in flat parts (use hand lens), but otherwise fits well within variation for cyanescens
L. dactylinum — supposed to be smaller, “almost squamulose” (??)

I am not convinced that the wrinkles of austroamericanum are noticeable in photos of this resolution. I’m not 100% certain I understand the species concepts, yet, though.

Created: 2011-02-01 01:09:24 GMT (+0000)
Last modified: 2015-04-16 19:53:02 BST (+0100)
Viewed: 102 times, last viewed: 2017-03-17 18:56:51 GMT (+0000)
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