The smallest of the small

[Erce]

can anyone give me the name of a orchid in same size as Platystele jungermannioides - i love that´, but i cant find it anywhere in EU

[King_of_orchid_growing:)]

There're a lot.

Bulbophyllum monilliforme (everything about this plant is tiny)

Lepanthes are tiny to large plants, but often with ridiculously small flowers.

Lepanthes pilosella (vining, each leaf is only less than a 1/4" in diameter)
Lths telipogoniflora (tiny plant, flowers a bit larger than leaf)
Lths tsubotae (tiny plant, flowers a bit larger than leaf)

Lepanthopsis astrophora (tiny plant, tiny flowers)

Oberonias are small to miniature sized plants, but their flowers are very tiny. I think they can rival that of Platystele in being small. Unless you have a jeweler's loupe in hand, it's very difficult to see any flower details unless you have remarkable eyesight. There are of course a few exceptions, but for the most part, the plants have miniscule flowers and for this reason are not always popular in the hobby. The flowers are arranged along a long fleshy inflorescence.

Oberonia arisanensis
Oberonia toppingii

Platystele stenostachya (1/2" - 1" leaves, tiny 1/8" flowers - successive bloomer, spike is like that of a Lepanthes)

Pleurothallis leptotifolia (1/2" tall plant, succulent leaves, tiny flowers)
Plths minutalis (tiny flowers, tiny plant)
Plths serracenia (small 1/2" tall plant, flowers same size)

All Porpax are minis. They have pseudobulbs no larger than 1/2" across. Actually 1/2" pseudobulbs are rather large for Porpax. If you look at them, they resemble two green peas stuck next to each other and smashed flat with a tiny fishnet covering them. The flowers are small, but they aren't Playstele small.

Porpax elwesii
Porpax fibuliformis
Porpax lanii
Propax ustulata

Schoenorchis fragrans (there are a lot of species that look similar btw - small vandaceous plant no taller than 3/4" with clusters of tiny flowers; the smallest vandaceous plant I'm aware of)

Trichosalpinx chamaelepanthes (vining - can be long, tiny leaf, flowers large for the plant)

There are more plants, these are just a few that I know of right off the top of my head that I've either grown or have seen.