Try http://www.orchidspeciessoc.gil.com.au/orchids.htm#D there is a
photo of the species there. A good general starting point is
http://homepage.powerup.com.au/~nepean/links.htm, or Jay's Orchid
Encyclopedia page at http://www.orchidspecies.com/index.htm (this
last might not have varieties).

Cordially, Phil
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Dr Phil Diamond
Department of Mathematics, University of Queensland, Brisbane,AUSTRALIA 4072.
Tel +61 7 3365 3253 Fax +61 7 3365 1477