Oldenburgia Trail, 31 March 2018. On the cliffs directly to the right of the ladder that leads down into the kloof. Some scrambling required.
Waters Meeting NR, 3 June 2018, about midway along the full 9km loop, on sheer cliffs overlooking the Kowie River. Biggest cluster I've ever seen.
Looks like arachnoidea, but seems to lack the "spider web".