LANKESTERIANA


18b Column without globose, setose appendages beneath; stipe variable .................... .........................................................19
19a Lip with a prominent keel below the 2-lobed callus; lip blade pilose; viscidium triangular, truncate .....................
 .................................................................................................................................................................................................................................... A e th e o r h y n h a
19b Lip without a basal keel; callus various; lip blade glabrous; viscidium ovate or subpandurate ( elliptic)........20
20a Viscidium ovate, without conspicuous stipe................................................................................ ............................. Chondrorhyncha


20b Viscidium subpandurate; stipe distinct ..


Ixyophora


ACKNOWLEDGMENTS. The authors thank Ron Determann
(Atlanta Botanical Garden), Tilman Neudecker, Klaus
Breuer, Marni Turkel, Gustavo Romero, and Andres
Maduro for plant material, and INEFAN (Quito,
Ecuador) and David Neill for permits and assistance
in Ecuador. We thank Stig Dalstrom for the drawings
in Figure 6. We thank Wendy Zomlefer and Samantha
Koehler for many constructive comments on the
manuscript. This work was supported in part by NSF
grant DEB 9509071 to WMW, NSF grant DEB 0234064
to NHW and WMW, and by grants from the American
Orchid Society Fund for Education and Research.

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