Orchid monographs

Revision oberonia

Genus nervilia africa arabian peninsu

Revisions coelogyninae orchidaceae IV

Taxonomic revision of bulbophyllum

Revisions of the orchid genera Agrostophyllum (section Appendiculopsis) - Mediocalcar - Bromheadia - Acanthephippium - Chrysoglossum, Collabium, Diglyphosa, Pilophyllum