The problem is that the pool of information from "The warbow" is already slightly outdated. Hovewer, I can ask either Andy Eckerton, or Mark Stretton with whom I m in one archery group - but if there indeed was confirmed non-yew bow on Mary Rose this information would be "big" and public already while ago.
Mind, you even if it wont be oficially published, "we" would know. The research of wood on the bows has gone so far, that DNA test has been done and the kindred living speciemens of the yew tree, have been located in alpine valley (Not that far from Celestios place I m told). To find out whatever one bow is or is not yew is fairly simple test. The confusion might exist because at least 3 "grades" of yew exists, of which the best italian is the most numerous, then there are bows which seems to be of slightly different worksmanship and supposed to be reclaimed from armoury storage and also probably - a favorite hypothesis of Alan Edwards the "Black bow" is somebodys loved weapon brought fom home, which can be easy true, taking in consideration fact that it is coarse yew with abundant character and varnish which does have nothing to do with that of the rest. (Probably english yew)
Well, there is no point to act as if heavy longbow cannot be made out of whitewood, I m doing it for the last 8 years. I have now made ash longbow for Mark which is 140# - and I actually had problems to get the weight down from over 160# which it had at first brace on tiler. I make 125# white wood bows routinely. But what is worth of considering, that whitewood bow is not something you would want to bring into wet field conditions, much less ship. See, they just dont shoot. They loose as much as 1/3 of their performance once they get wet and there is nothing which prevents them to suck water. (Modern polyurethane plastic finish, but even that is not total)
Now, that doesnt matter, if you only have to shoot once in a week to fullfill the leter of the law and you ll keep the bow to dry hung over your fireplace. That doesnt work in trenches.
Yew on the other hand isnt affected by moisture.
Mark, I m not looking for a fight, but if anybody has to get good info, it is better to become EWBS associate member as nobody has better pool of knowledge now. I mean, we are arguing here pool of knowledge of 2003 or some.
Jaro