Dear Geddada,

I do not know whether these two genera exist in India, but your lichen looks very much alike to Parmelia (e.g. P. tiliacea) or Cetrelia that are quite common in Europe. Since I do not see any apothecial/perithecial formations on your picture I cannot go any deeper in guessing!

Cheers,

Neven

Hi,

I think it is Parmotrema, but without a closer look and the chemistry it is hard to say...

Sincerely,

Martin

At least this time the photo is in focus...

There are at least five species in that photo, but I assume you are interested in the large, foliose thallus?

It is a parmelioid lichen, possibly a Parmotrema, but you would need to check if the lower side has a wide marginal zone that lacks rhizines. Also, the species can certainly not be identified from this photo alone. One would need to know the chemistry of the specimen. It looks like the thallus has soredia, but from the photo it is difficult to see where and how they are formed, what they look like.

You need to understand that identifying lichens in most cases requires quite a bit more detail than a simple photo can provide and if at all possible from a photo that photo needs to be of good quality. Often it is necessary to collect the specimen and study it more carefully.

There are a lot of excellent lichenologists in your country (India). Why do you not get in touch with them?

I agree with Martin and Frank that it is a parmelioid lichen, but genera and certainly species I do not identified from photo alone.

Can anyone help to identify this Lichen? - ResearchGate. Available from: https://www.researchgate.net/post/Can_anyone_help_to_identify_this_Lichen2 [accessed Jul 7, 2015].

I agree with Frank that it could be a Parmotrema species, but we would need further information to be sure. It could also be a Parmelia, but not P. tiliacea because no Isidias are present.

Kind regards,

Michael

I agree with the other colleages that it looks like a Parmotrema, but  it would be necessary to have a look at the colour of the underside, distribution of rhizinae,whether it has sredia and thier distribution (shape and distribution of soralia) and, of course, the chemistry.

Looks like a Parmeliaceae sp. You may need chemistry.

I agree with all the authors that the photo shows a species of Parmeliaceae but that it is impossible to say more without chemical and other characteristics.

Looks like a Parmotrena  sp but you need chemical informations (major compounds and also you can realize some chemical test directly on your sample (K, P, KP and C) to confirm this identification).

I agree with colleagues both that it broadly looks like a Parmotrema, and most that lichen identification can hardly be based on a picture only.

Just to add to the discussion, have a look at the digital identification tools of the Dryades Project by prof. P.L. Nimis form Univeristy of Trieste (profile at the first link below) where, among many others, a dichotomous key to lichens from Sri Lanka can be found (the most close to your target) including several species of Parmotrema, with characters description and pictures.

To acces the key, follow the second link below and, at the bottom of the opening page, press "dichotomous key" that will guide you through the specimen identification.

Let me know if it helps

https://www.researchgate.net/profile/Pier_Nimis

http://dbiodbs.units.it/carso/chiavi_pub21?sc=656

I think that can be a species de Parmotrema, but for to know exactly the species, it request to  look the lower side of the thallus and to apply some chemiical test in transversal cross of the thallus according to it indicate in the keys of species of this genus

 It's a kind of Parmotrema, to determine the species is necessary to see the lower cortex and apply reagents in cortex and medulla. It is not possible to know the species well, because neither soralia or isidios or apothecia is not appreciated.

It should be a species of Parmotrema

A species in the genus Parmotrema

Thanks to all  for identification of this Lichen specimen and thanks to Dr Frank for his detailed answer. I am thankful to Prof. Guido Incerti for his valuble information on Lichens and its identification tools. Thank you sir