Observation 93155: Nostoc commune
When: 2012-04-18
No herbarium specimen

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Recognized by sight

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Check out Lichinella, too
By: Jason Hollinger (jason)
2012-04-23 02:54:53 AST (-0400)

Might not be an option in CT – genus is only in the west in N. Amer. I think? But it gives some idea of how similar it can look:

observation 69461

(It also uses Nostoc I believe.)

Lichenologists confuse them in the field all the time
By: Jason Hollinger (jason)
2012-04-23 02:50:39 AST (-0400)

Collema is also Nostoc commune, but the algae are embedded in a homogeneous matrix of fungal hyphae. Clearly most Collema produce obvious fungal fruiting bodies, and/or obvious lichen-like thalli. But what you see here, all dried up and crispy-fried in a bird bath (or on a roadside in full sun or on a sidewalk or…) blurs the distinction. Whenever there’s no obvious structure or pattern to it, I immediately question whether it is half-dead Nostoc instead of Collema. If you successfully rehydrated the stuff in the photo (might be beyond help, though) it should turn green and rubbery to gelatinous.

Ive only seen N commune twice, and
By: damon brunette (damonbrunette)
2012-04-22 18:54:02 AST (-0400)

on bothe accounts it was green, and rubbery with folds. Maybe you could explain the difference between a cyanobacterium, and one that is lichenized if you would…

Consider Nostoc commune
By: Jason Hollinger (jason)
2012-04-22 17:02:11 AST (-0400)

Just a cyanobacterium. But if lichenized, try Collema. Not one of my strengths.

Created: 2012-04-22 15:07:50 AST (-0400)
Last modified: 2012-04-22 17:02:52 AST (-0400)
Viewed: 70 times, last viewed: 2017-03-30 19:14:06 AST (-0400)
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