pf339's picture

Lichen ah

Observed: 26th March 2012 By: pf339
S159 Neighbourhood Nature - course complete
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Lichen ah

Lichen (ah). Grey fruticose lichen growing on twig. Possibly isidia just visible on branches on the extreme left (at about 9 o’clock and 8 o’clock) in image. Possibly Usnea cornuta.


Caution: Do NOT use iSpot to identify fungi to eat!

Some fungi are very poisonous so a mistaken ID could have serious consequences.

Species interactions

No interactions present.


AlanS's picture


I can well believe this is Usnea cornuta, but always very difficult to tell from a photograph.


Edit: - see my further note below. I now think this is U. subfloridana.

pf339's picture

Usnea sp

Many thanks to all who have considered this observation. It is first possible Usnea sp that I've seen. Since leaving it I have come across several pointers(e.g. pale or blackened at base and whether side branches narrow where they meet the main stem) I should have looked at carefully to try to pin down possibilities. Next time, hopefully!

AlanS's picture

Also important

It is also often important to look at the nature of the soredia and isidia (or 'isidiomorphs') on the fine branches.

Looking at this again, what we can see of the detail suggests to me that this is more likely to be U. subfloridana, generally much the more common species.

But Usnea spp. are highly critical even with a specimen in hand.


pf339's picture

Usnea spp

Information in messages helpful in giving me pointers that will help my future identification efforts (and in confirming how challenging identification can be).
Grateful for comments and for you revisiting the observation.