I'm guessing the plant is only a couple of cm across? Mine have produced flowers when ridiculously small.

Yes, these recovered in time (photos are from 2014).

AmyJay wrote: ↑Sat Jul 01, 2023 3:17 pmwhat does sunburn look like on a cactus?

Cyrill uses the species name soehrensii for all the plants in this genus http://tephroweb.ch/tu/tukulturpflanzen.htm soehrensii being the type of the genus. With so many names based on vague and/or incomplete descriptions without a type or location information or a photo thre's something to be said ...

It's always nice to have paper versions but, in the absence of that, there are e-versions of some of the older ones https://cactuspro.com/biblio/en:bradleya

ianstrutt wrote: ↑Sat Jun 17, 2023 6:54 pmaccording to llifle maihueniopsis subterranea ssp. pulcherrima = puna subterranea f. incahuasi = cumulopuntia subterranea ssp. pulcherrima

That's disappointing: there is no validly published name for this in Puna.

The first is Stetsonia coryne.

You'll come across this under the name Cumulopuntia rossiana more often than pentlandii.

Can you not just use a mains-powered fan? Or use a transformer to power your PC fans? Solar seems a bit complicated and expensive.

Don't forget about Rob Bregman's while you're waiting. https://cactuspro.com/biblio/en:bregman