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These plant looks healthy, so why should mold come from a healthy plant ? Mold or in general fungus spores are omnipresent in the air ... they need three things to germinate ... moisture, the right temperature and organic substance for food e.g. dust on the surface.

It is definitely mold .... I had the same problem with pots where I tried rockwool as potting medium. Maybe rockwool is susceptible to this problem.

It stays impressive even if it could be a bit longer. 👍

I agree completely ...... on the other hand it's really impressive to see this plant in flower after it is out of flask only for 3 years.

Tom, I measured my leaf span of leaves vis a vis from tip to tip over the centre ... so it may be more or less the lenght of two leaves. But theory isn't all, but praxis is the real thing. So I made a quick comparison photo of my Paph. villosum (left), Paph. villosum var. laichaunum (centre)...

Tom, I can't confirm the smaller plant size in geberal of Paph. gratrixianum. The only variety which may have shorter leaves might be var. daoense. The other varieties are more or less the same size as Paph. villosum or slightly bigger. Stephen Manza (silence882) mentiones on Slipperorchids.info...

During winter time, from October (before the temperature drops too low) until late April, they sit behind a west facing window with bright sun, if she shines, in the afternoon. During summer I put them outside and the sit underneath a roof between the house and the garage in more or less shade...

Great display, David !

Tom, so far my plant is quiet compact, the leaf span is about 36-38 cm (14,17-14,96"). Same leaf span has the variety var. annamense and the f. aureum but these plants haven't flowered yet. The var. villosum (post #1 in this thread) is slightly bigger and has a leaf span of about 44-48 cm...

Another variety of Paph. villosum is flowering again .... Paph. villosum var. laichaunum. It is ... at least in my eyes and in my collection ... the prettiest vatiety of Paph. villosum.

Paph. villosum is completely wrong ... we talked about Paph. callosum ore one of its countless hybrids.

At any rate it's no P. barbatum ... it looks like P. callosum to me too ... or one of its countless hybrids.

Tom, this is a real feast for the eyes .... wonderful.

I won't assess if Paph. nigritum really excists or if it is a synonym of Paph. barbatum. But if it was really found on Borneo island at least the origin of both are different. At least there is a photo of Paph. nigritum on Jay Pfahl website 'orchidspecies.com' ... if it shows it or another...

Very nice one.

WOW ... that's great ! but I like also clone 12 due to its shape and colour.

Very elegant flowers ... I like these semialba ones.

Pretty one. I'm wondering where the increase of size comes from ? The flower of the hybrid seems to be bigger than the flowers of any spice or henry.

Just lovely, not even the scent is hard to describe but also the shape of these extravagant flowers.

I like these Catts. with chocolate coloured petals a lot ... just lovely even of the fact that you have to look twice to find out it's a hybrid.