Juergen Boehm Orchids was good enough to provide me with the following information regarding Trevoria:

"The genus Trevoria was described by FC Lehmann 1897 ser 3 vol21:345-346 in
Gardeners Chronicle with a black and white picture of T chloris, T chloris is
the type species and was not found again or did not survive and flower in
culture so noone knew what it really looks like until it flowered in my
friends culture. A foto of this single plant is also in the new vol 6 of the
book NATIVE COLOMBIAN ORCHIDS: Volume 6: Supplement: Leucohyle-Zootrophion.
1998. It grows under intermediate temperature. Noone knows exactly where T
chloris grows in the field, the native Indians who collected the plant did not
tell it to anyone. They sell a few rare plants to make some money but without
exception keep habitat secret. Chloris is by far the best species in the
genus. T chloris was found by Carl Lehmann at the western slopes of mountains near
Popayan Dptm Cauca at 1000-1700m. The other species are: T lehmanii, escobariana, glumacea and zahlbuckneriana. [T ecuadoriensis is not a valid name as there is no herbarium material of such
a species as far as I heared.]

The lava stone for culture is watered daily with 200 yS of a urea free mineral
NPK fertilizer, leaves should dry fast after they get wet to prevent leafe
spot fungi, every 10 days plants get organic fertilizer over the leaves in a
solution of up to 600yS, sometimes fish emulsion, sometimes sea weed
fertilizer (Bioalgen S90) or an amino acid fertilizer. Other Genera that grow
well on such stones is closely related Schlimia and also terrestrial
Polycycnis like morganii.

T chloris flowers are extremely fragrant and dont need to wait for
pollinators, they only open for a day.

Concerning sandwich mounts it should be mentioned that Coryanthes were found
to grow even better on sandwich mounts without bark, only Styrofoam (make sure
by calling the producer its free of Freon or similar toxic substances added to
prevent fire in some kinds of styrofoam), some large pieces of broken clay
pots and a bit FIBER peat fixed together with a cord made of synthetic
material.

Mounts are watered daily but get nearly dry every day. Fertilizer same as
above."