Well I got a book on orchids, and in it they give a little discription of some Pleurothalli,
"P. grobyi, has green, white or yellow-orange flowers, marked with purple or red in summer.
P. lanceana, has many yellow flowers, tinged with red
P.schiedii, is a tiny and fascinating species only 2.5-5cm (1-2in) tall. The flowers are light brown and the edges of the sepals are fringed with pendant blobs of white wax.
P. sonderiana, is another tiny plant with lots of long lasting, small orange flowers."
The book also mentions that "orchids of this genus are mostly small plants with slender, single-leafed stems and small flowers. Few are showy but they have many enthusiasts. Pot in a fine bark mix or sphagnum; they like high humidity and cool to intermediate temperatures and very suitable for an orchid case."
Hope this helps. Let us know if you think its one of the ones the book describes.
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
Goblin Market
by Christina Georgina Rossetti
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