Hexagonia tenuis ?

Hexagonia tenuis (Fr.) Fr., 1838 (syn: Boletus tenuis Hook., 1822; Daedaleopsis tenuis (Fr.) Imazeki, 1943; Favolus tenuis Fr., 1825; Hexagonia cervinoplumbea (Jungh.) Lév., 1844 ..; Hexagonia subtenuis Berk. ex Cooke 1882; Hexagonia tenuis var. cervinoplumbea (Jungh.) Cleland & Cheel, 1923 ...; Polyporus cervinoplumbeus Jungh., 1838; Polyporus tenuis (Fr.) Klotzsch, 1833; Pseudofavolus tenuis (Fr.) G. Cunn., 1965; Scenidium cervinoplumbeum (Jungh.) Kuntze, 1898; Scenidium tenue (Fr.) Kuntze, 1898; Trametes tenuis (Fr.) Corner, 1989 ....);             

Yellow Bracket fungus
On a dead tree bark, forest floor, 
size ~ 15 cms, projecting from a fallen dead tree trunk, humid weather, 
Top Slip, Anaimalai,
Western ghats, Tamil nadu

This is Phellinus igniarius. It causes rot on living trees also.

Phellinus igniarius has a Fomes like lumpy look and never so flat and in-curved please check from the link below
  1. http://www.commanster.eu/commanster/Mushrooms/Basidio/SuBasidio/Phellinus.igniarius.jpg
  2. http://upload.wikimedia.org/wikipedia/commons/a/a9/Fomes_fomentarius_dark_2009_G1.jpg
I think this fungi is Hexagonia tenuis because of its zonate, yellow and slightly depressed basidiocap.

Yes ur right ... this is not Phellinus igniarius . But to conform it as Hexagonia tenuis let us first see the pores. I agree with u upper surface of basidiocarp matches with Hexagonia tenuis.

Yes ... if ... can kindly provide the photos of the pores the problem will be solved !!!!

That's all the information I had.
I would repeat ... words "That's enough for now"..
Thanks a lot ! Will do better next time.