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Added: 8th April 2011 Description:
Found on lime tree in Herbert Park (Dublin), lichen with large pale green lobes - appears to be fruticose, but using keys is most likely Parmelia Sulcata, a foliose lichen. Ramalina canariensis would probably be the most likely if fruticose.
Identifications Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
Confidence: It's likely to be this, but I can't be certain. Notes: Using ISpot lichen keys and A Key to Common Lichens on Trees in England (Natural History Museum).
Confidence: It's likely to be this, but I can't be certain. Notes: Definitely a Ramalina. It is fruticose (green cortex on both surfaces). The problem is deciding which one, and immature Ramalinas are easily confused. However, looking at the photos at highest resolution on a 26" monitor, I believe I can just see the lobe margins splitting to produce soredia - the key feature that separates R. canariensis from young R. fraxinea. So good original suggestion and I think the ID can be reasonably definite, though I wish I could take a hand-lens to the original specimen! [If you get to Parmelia sulcata in a key for this, something is very wrong! P. sulcata is very different in a number of characters, notably it is foliose with a quite differnt underside - black with rhizines (like tiny rootlets) - and appressed to the bark, while the upper surface is marked with a network of tiny, white breaks in the surface (pseudocyphellae). The surface of R. canarienis is merely wrinkled. Alan
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