Observation 117109: Usnea strigosa group
When: 2012-11-18
No herbarium specimen

Proposed Names

32% (2)
Eye3
Recognized by sight
56% (1)
Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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no worries
By: Jimmy Craine (doctorghosty)
2012-11-19 13:04:26 GMT (+0000)

the pickiness of this site is one of the things I love the most, thank you for the explanation Jason

Sorry to be picky
By: Jason Hollinger (jason)
2012-11-18 19:01:13 GMT (+0000)

But in this case we have a perfectly good “group” name to use for these sorts of observations in absence of chemistry data. There is no way a priori to distinguish, for example, C. endochrysea and C. strigosa s. str., without spot tests, and sometimes even TLC is required.

I got this key from J. Lendemer a few years ago, it may be out of date:

1a) base of “trunk” black, ~higher elevations, salazinic acid (K+ yellow immediately turning dark blood red) . . . U. subfusca
1b) not as above . . . 2

2a) red spots on cortex, medulla white . . . U. michauxii
2b) not as above . . . 3

3a) medulla pink and CK+ orange, rare . . . U. cristatula
3b) not as above . . . 4

4a) fibrils short and spinulose, medulla white with galbinic acid (K+ reddish), coastal . . . U. evansii
4b) not as above . . . 5

5a) medulla white . . . U. strigosa
5b) medulla pink . . . 6

6a) spores > 9 µm, medulla with norstictic acid or nothing (K- or K+ yellow turning bright red, C-, KC-, UV-) . . . U. endochrysea
6b) medulla pink, spores < 9 µm, chemistry variable, including possibly norstictic acid . . . U. strigosa

Created: 2012-11-18 15:06:51 GMT (+0000)
Last modified: 2012-11-18 18:51:35 GMT (+0000)
Viewed: 36 times, last viewed: 2014-03-09 00:44:20 GMT (+0000)
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