(Greek, koilos, hollow: referring to the pollen masses).  Orchidacceae, tribe Vandeae.  Six species of central and South American epiphytic orchids, divided into 2 strongly marked groups with widely different kinds of inflorescence.  C. macrostachya is a type of the first section, with long racemes of numerous small, horizontal fls., which are much exceeded by the long spreading bracts, and the base of the column short.  C. bella is typical of the second section, with the fls. few, larger, erect, in groups of about 3, longer than their bracts, and the base of the column produced to twice its own length, which gives the fls. a tubular appearance.  Coelias are of minor importance.  They grow best in pots of peat and sphagnum, with a little charcoal.

A. Fls. rosy red, numerous, small, in a long raceme.
macrostachya, Lindl.  Pseudobulbs 2 1/2 in. long, almost round, with brown scales at the base: lvs. about 3, from the top of the pseudobulb, 1 ft. or more long. lanceolate. arching, broader than in C. bella, and not channeled: sepals red; petals white.  Mexico.  R.H. 1878: 210.  B.M. 4712 shows a dense raceme 8 in. long, with more than 75 fls.

AA. Fls. white, tipped purple, few, large.
bélla. Reichb. f.  Pseudobulbs smaller and more constricted at the top : lvs. 6-10 in. long, narrower, channeled above, arching: fls. 2 in. long, erect, 3 or 4 in number, with the midlobe of the lip orange-colored.  Guatemala.  B.M. 6628.