The Moolavar is Purushothaman in Bujanga Sayanam facing East.

Thaayaar - Poorvadevi, Poornavalli.

The sthala vriksham is Vaazhai (Plantain)

Siva Peruman, had plucked off one of Lord Brahma's heads because he had lied.  But it was still a sin & the skull got stuck to his hand.  He got Mahalakshmi to give him alms in the skull & was rid of his sins & doshams.

There are separate sannadhis for Siva, Parvathi, Brahma, Saraswathi...

Since Lord Siva appears as Bikshaadanar in this temple, the sthalam is also called Bikshaandar Koil.

Mangalasasanam:
Thirumangaialwar - 1399

1 paasuram.