What woods are best used for bearings?

crosspost from hurdy-gurdy list

"Even if this one is not really linked to the hurdy-gurdy: A friend of 
mine owns a water mill from baroque times and the bearings of the water 
wheel (he´s actually replacing it) are traditionally made from apple 
wood. Not really what I would have used but exactly what he found and 
what he was told from several experts and museums here. But I don´t 
think that it´s a good idea to transfer this to the hg - the humidity is 
hopefully at least a little different "

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