Burgh, W. van der and E.F. de Vogel. 1997. Revision of the orchid genera Chrysoglossym, Collabium, Diglyphosa, and Pilophyllum (subtribe Collabiinae). Orchid Monogr. 8 (1997) 135-174.
Burgh, W. van der and E.F. de Vogel. 1997. Revision of the orchid genera Chrysoglossym, Collabium, Diglyphosa, and Pilophyllum (subtribe Collabiinae). Orchid Monogr. 8 (1997) 135-174.
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