The presentation of the data is perhaps a little confusing. As you say, only seven species are listed in Table F1 of AS 3959 as "bushfire-resistant" according to the test described in Section F2 of the Standard. Other species were in the process of being tested at the time our drop-down information tag was written. However that information needs updating since only the seven species listed in AS 3959 passed the test, and no further tests are planned in the immediate future.

It's always a challenge installing t & g flooring on a verandah, although it was common practice in earlier times. Today decking is the preferred option. If floorboards are desired for character reasons the building owner would be advised to shield the verandah from the weather as much as possible, for example by growing a creeper, installing 'cafe blinds' or similar. Since swelling is more likely than shrinkage, given that flooring is a kiln-dried product, we would suggest leaving a 1 mm space between all boards, not just occasional boards.