You have been zapped by the "naming wars". There are at least two camps of how orchids should be organized. Maybe more. And that whole section has been hardest hit, with species changing genus almost daily, it seems.

Ignore all that and just be aware. Most of the commercial "Odont-ish" hybrids commonly available should like similar conditions.

Richard is right, but maybe the info below will help clear things up a little.

According to the RHS your orchid is an Odontoglossum. There is also another hybrid registered as Odontioda Margarete Holm (Odm. Bic-ross x Odont. Adolf Rohl), so that may be why there is some confusion.

Interested in how I came up with this info? Go to the RHS site and type in "Margarete Holm" for "Grex:".

Best,
~Jem

Very helpful - thank you both.