I'm not entirely surprised - describing these groves as being "hundreds of trees" seems somewhat generous. Offord et al describe the sites somewhat differently

I'm not entirely surprised - describing these groves as being "hundreds of trees" seems somewhat generous. Offord et al describe the sites somewhat differently: "... is restricted to two populations (Site 1: approx. 23 adult trees; Site 2: approx. 15 adult trees, sites approx. 2 km apart) in the Wollemi National Park in the Blue Mountains" It's pretty easy to imagine overlooking small groves like this in a mixed stand.