One of my tinier orchids is blooming now, Specklinia grobyi, formerly known as Pleurothallis grobyi. I actually have two plants of this species, from different sources. This one is from Andy's Orchids, and has a much paler flower than the one I got from Ecuagenera, which bloomed last fall.
They are so tiny and delicate, and now looking at the pictures on my computer, I see that I broke a flower while photographing! Boo!
Each flower is about 8 mm long (less than 3/8 inch), on a six-inch
spike. The reddish thread right above my finger in the last picture is
the base of the spike.
The whole plant is such a tidy little package.