That's a possibility, though the amount of that apparently soft textured brown on the upper sections and towards the point of attachment, particularly with the most immature speciment at the base of the image and the colour on the pore surface make me lean towards a Phellinus sp.. Whereas I find L. portentosus tends to lean more to grey tones on the upper surface with pale pores. Also the lack of obvious insect damage I would expect on an aged specimen of this species. Even the ones that have been uploaded recently that have been damaged by fire still show that pale colour of the context through the singed sections.
It looks to be growing on some long dead wood based on the colour and deep fissures rather than a recently deceased tree or branch but hard to tell for sure from this image. I don't recall seeing Laetiporus portentosus on old dead standing timber - but that might be saying more about my memory then the habit of the fungus.
It is definitely old dead wood (a stump with one or two cutoff main branches coming out of it). I can take further pictures if that might help? It was on the underside of one of the branches in permanent shade.
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