Wild Rose's picture

2 Lichen on Oak tree branch

Observed: 25th January 2011 By: Wild Rose
Lichen/moss on Oak Tree
Description:

Growing on an Oak tree situated in hedgerow.
The futhermost I believe to be Oak Moss (which is in fact a lichen).

Identifications

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.

Comments

gardener's picture

Hypotrachyna revoluta or H. afrorevoluta

What had been identified as H. revoluta has recently been recognised as two different species, with the possibility/probability that Hypotrachyna afrorevoluta is the most frequent.

See Alan's website for details and photographs of the two species:
http://www.lichens.lastdragon.org/Hypotrachyna_revoluta.html

synan's picture

The revoluta/afrorevoluta dilemma

Well, I thought I hadn't seen H. revoluta previously, but looking through my unidentified photos, there are quite a few observations that seem to fit. I think I have seen plenty of it today near Wigan, and will post some later for confirmation. I have seen H. afrorevoluta before: http://www.ispot.org.uk/node/242220

(and have just realised it looks very much like one of the images of H. britannica on Jenny's website, but if I worry about that too, the lichenising bits of my brain will burn out).

I thought I was getting to grips with some of the differences between mature revoluta and afrorevoluta material (pale, fine vs. dark, course soredia, and raised vs. flattened lobes), but then Dobson says of H. afrorevoluta that "the soredia originate in pustules", and one of the lobes developing soredia in this (Wild Flower's) specimen looks very pustular, so maybe it's back to the drawing board for me.

Nigel

gardener's picture

Part of the trouble with

Part of the trouble with lichen identification is that I'm sure the species don't always read their descriptions in the reference books!

Having said that I've got a load of revoluta/afrorevoluta specimens that I'm completely unsure of - tempted to agg. the lot