Can't identify. Won't bloom. Won't die.

[gnathaniel]

A tetragonum seedling I had in a pot a few years ago looked a bit like that, they will grow straight upright in pots until they get bigger. The suggestion of a hybrid seems pretty plausible, and you guys know Australian orchids a lot better than I do... The sheathing bracts and apices of growths not looking very farmeri-ish is the main reason I brought up tetragonum. I have young examples of both species on hand, I'll try to take some comparative photos once I get the time (only 2 more days of exams!!!). Off the top of my head, farmeri PBs have more (than OP's plant) pronounced swelling of the final couple nodes, and also a glossier surface. May be misremembering, though, not around to look at it right now.

And thanks for the tetragonum culture tips! It's one of my favorite species but I've never done great with it, I think mostly because keeping them inside my house for the winter sets them back every year. This year I may be able to grow some orchids semi-outdoors all winter. Anyone have experience with tetragonum's low-end temperature tolerance?

[Bloomin_Aussie]

They'll take it pretty cold. At least down to freezing. Mine are outside all year and we often get down to below 5C during winter.

[greengarden]

Yep I knew a number of people who used to keep them outdoors down in Melbourne where winter is very cold. I've been hunting one myself, they are a favorite of mine but all i seem to find lately are hybrids and I much prefer the real thing, that and plectorhiza tridentata and sarcochilus australis. I use to have a tridentata but I killed it with neglect in a forgotten corner, I'm eyeing off a flask of the sarc but it eon't be ready until late next year.

[willemjvr]

Hello,it's a Dendrobium and not a Catt. to me it looks like a Dendrobium Griffithianum.

[greengarden]

Maybe, although I think griffithianum tends to be boxy when dry but becomes quite rounded when plump and those are very square and plump. Could be wrong though, I've never actually seen a griffithianum in real life, only images...

[Roy]

To be honest, imo, the plant isn't growing in the right conditions. Its making growth but never maturing properly. It also appears to be loosing its leaves far too quickly. Over potted also I would suggest.

[Gin]

I have both the Dendrobium griffithianum and the Dendrobium farmeri can take pictures of the P bulbs and post them tomorrow .

[Bloomin_Aussie]

Originally Posted by greengarden

Yep I knew a number of people who used to keep them outdoors down in Melbourne where winter is very cold. I've been hunting one myself, they are a favorite of mine but all i seem to find lately are hybrids and I much prefer the real thing, that and plectorhiza tridentata and sarcochilus australis. I use to have a tridentata but I killed it with neglect in a forgotten corner, I'm eyeing off a flask of the sarc but it eon't be ready until late next year.

Hmmm... I may have a solution to that problem Since I haven't got to all my terrestrials yet I'll gift you one of my tetragonum seedlings.

[greengarden]

Sounds great!

[erna]

Originally Posted by gnathaniel

I think you're probably right, Dan, but what about tetragonum? I'm having a hard time telling from the picture. Davie, could you repost a bigger photo? Though growing well in high light sounds more like farmeri I guess...

I agree, I would have also made that guess. A better close-up might help.