Observation 93155: Nostoc commune Vaucher ex Bornet & Flahault

When: 2012-04-18

Collection location: Haddam, Connecticut, USA [Click for map]

Who: damon brunette (damonbrunette)

No specimen available

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Eye3 = Observer’s choice
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Check out Lichinella, too
By: Jason Hollinger (jason)
2012-04-23 01:54:53 -05 (-0500)

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 01:50:39 -05 (-0500)

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 17:54:02 -05 (-0500)

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 16:02:11 -05 (-0500)

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

Created: 2012-04-22 14:07:50 -05 (-0500)
Last modified: 2012-04-22 16:02:52 -05 (-0500)
Viewed: 74 times, last viewed: 2017-08-15 20:35:38 -05 (-0500)
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