Dendrobium speciosum
“A spectacular epiphytic orchid with stout swollen pseudobulbs..” – NPOS p.262
While I’m on the topic of orchids these Rock Orchids grow on several rocks in the front yard. Like the Tongue Orchid they too are hardy plants ( you would have to be to survive in my garden ! ) and survive hot dry summers perched on the rocks with no watering. They are supposedly rare in the Sydney area so I wonder if they were planted by a previous owner.
Resources and references