Observation 106473: Ramalina americana Hale
When: 2012-08-06
Herbarium specimen reported

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Recognized by sight
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Specimen confirmed by Jim Bennett
By: Andrew Khitsun (Andrew)
2013-12-29 21:00:11 CST (-0600)
Medulla definitely
By: Jason Hollinger (jason)
2012-08-22 20:29:27 CDT (-0500)

Try to find a nice thick branch with good fluffy thick medulla. The cartilaginous stuff just inside the cortex doesn’t seem to fluoresce reliably, despite being white. Granted sometimes you’ve just got to make do with what you can manage, in which case the test is invariably ambiguous, sigh. But if you can find a good spot with good thick fluffy medulla, you can potentially be very confident of the results. Especially if you get a good bright reaction.

Let me check with UV…
By: Andrew Khitsun (Andrew)
2012-08-22 20:16:08 CDT (-0500)

What should I look for? Medula or thallus?

You really only have four choices
By: Jason Hollinger (jason)
2012-08-22 19:46:39 CDT (-0500)

with fertile Ramalina:

R. sinensis – broad and big, as you’ve seen, and one side of the branches has very conspicuous and abundant pseudocyphellae
R. dilacerata – branches barely flattened, supposedly hollow and perforated, but in any case a small species with no pseudocyphellae
R. americana and R. culbersoniorum – all the rest :), distinctly flattened branches with warty pseudocyphellae sparse to abundant, but not mostly on one side, if you get any chemistry – K, C, KC, UV, anything – then it’s R. culbersoniorum, otherwise it falls back on R. americana by default

R. americana is clearly a trashcan species, but there it is. And I’m not sure separating out all these wacky chemical races into R. culbersoniorum improved anything, frankly. But when in Rome…

This is very well-developed for R. americana, but everything up there is over-developed, it seems, so why should this surprise us??

[EDIT: oh, and I should mention that R. culbersoniorum is very uncommon so far north, although you’ve sent me at least one specimen, so it does occur.]

Ramalina americana or something else?
By: Andrew Khitsun (Andrew)
2012-08-22 19:28:15 CDT (-0500)

Working down keys in Thomson, I arrive at R. americana. But I have a feeling when it comes to this genus – Thomson is incomplete. There is got to be other species of Ramalina in WI. This one is medula K-, C-, KC-, and I didn’t do P test yet. The amount and size of apothecia is just so in your face – hard to imagine R. americana like that.

Created: 2012-08-22 19:14:02 CDT (-0500)
Last modified: 2013-12-29 20:58:47 CST (-0600)
Viewed: 34 times, last viewed: 2016-05-12 17:18:47 CDT (-0500)
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