| Oncidium Orbona | 01 Jan 1931 | Oncidium Orion × Oncidium Ossulstonii |
| Oncidium Conchita | 01 Jan 1930 | Oncidium Alcazar × Oncidium Ossulstonii |
| Oncidium Lenore | 01 Jan 1924 | Oncidium Lambeauianum × Oncidium Ossulstonii |
| Oncidium Triumph | 01 Feb 1919 | Oncidium Ardentissimum × Oncidium Ossulstonii |
| Oncidium Alexanossa | 01 Jan 1919 | Oncidium Ossulstonii × Oncidium Queen Alexandra |
| Oncidium Serbia | 16 Nov 1918 | Oncidium Aglaon × Oncidium Ossulstonii |
| Oncidium Alcimeda | 02 Mar 1918 | Oncidium Jasper × Oncidium Ossulstonii |
| Oncidium General Cadorna | 25 Nov 1916 | Oncidium King Emperor × Oncidium Ossulstonii |
| Oncidium Peerless | 25 Dec 1915 | Oncidium Eximium × Oncidium Ossulstonii |
| Oncidium Ivernium | 05 Jun 1915 | Oncidium Doris × Oncidium Ossulstonii |
| Oncidium Mendax | 13 Jun 1914 | Oncidium Ossulstonii × Oncidium kegeljani |
| Oncidium Uranossa | 02 May 1914 | Oncidium Ossulstonii × Oncidium Urania |
| Oncidium Rolossa | 02 May 1914 | Oncidium Ossulstonii × Oncidium Rolfeae |
| Oncidium Newlingii | 02 May 1914 | Oncidium cirrhosum × Oncidium Ossulstonii |
| Oncidium Louise (1914) | 01 Jan 1914 | Oncidium fuscatum × Oncidium Ossulstonii |
| Oncidium Roma | 01 Jan 1914 | Oncidium Crispo-Harryanum × Oncidium Ossulstonii |
| Oncidium Lucidum | 01 Jan 1913 | Oncidium Ossulstonii × Oncidium spectatissimum |
| Oncidium Clare | 01 Jan 1913 | Oncidium cirrhosum × Oncidium Ossulstonii |
| Oncidium Louise | 01 Jan 1912 | Oncidium Ossulstonii × Oncidium nobile |
| Oncidium Fascination (1912) | 01 Jan 1912 | Oncidium Fascinator × Oncidium Ossulstonii |
| Cyrtocidium Ashworthianum | 01 Jan 1911 | Cyrtochilum edwardii × Oncidium Ossulstonii |
| Cyrtocidium Ashlandense | 01 Jan 1911 | Cyrtochilum edwardii × Oncidium Ossulstonii |
| Oncidium Elissa | 01 Jan 1911 | Oncidium vulcanicum × Oncidium Ossulstonii |
| Oncidium Felicia | 01 Jan 1911 | Oncidium Heatonensis × Oncidium Ossulstonii |
| Oncidium Camilla (1910) | 01 Jan 1910 | Oncidium noezlianum × Oncidium Ossulstonii |
| Oncidium Doris | 01 Jan 1910 | Oncidium alexandrae × Oncidium Ossulstonii |