All fairly clearcut. The L. verruculosa just might be "inae" although it doesn't look like a classic one.

D just looks like a straight L. lesliei. Possibly someone thought they'd crossed it with a Dinteranthus, but it looks like it wasn't.

If they damp off, I would say they need more shade untill they are big enough. How much sunlight are they getting? I'd say the opposite. Avonias aren't shy retiring cactus seedlings, they thrive on direct sunlight from a very small size. Also constant moisture until the first stem starts to grow, t...

Seems a bit too warm still.

Wouldn't it be even stranger if the old leaves had dried up, but last year's flower still showed up now? I've never seen that.

I would go with L. marmorata from what I can see. Some distinguishing features you might want to look for: - L. marmorata tends to be 6-merous, L. optica 5; - L. optica tends to have fairly closed fissures (although obviously open when flowering) and lopsided leaves, L. marmorata more even leaves an...

Classic

Or mine are over-potted? I consistently over-estimate the size of this species (or don't water it enough!), although it will clump up nicely in time.

*Very* old! I don't have any that have divided. Not the sort of plant where you can nip out the growing point to make it branch?

Something is emerging from my Mammillaria albifloras. I blame the bees.

The flowers age to less more rosy and less clear pink. These are about done.