| Veronica hederifolia | GB, VC1 West Cornwall, Gweek | John Patrick Micklethwait Brenan | | 3/4/1976 | K |
| Blysmus compressus | GB, VC6 North Somerset, Shepton Mallet | John Patrick Micklethwait Brenan Richard Alexander Fraser Brenan | | 12/6/1969 | K |
| Epipactis phyllanthes | GB, VC59 South Lancashire, Freshfield | John Patrick Micklethwait Brenan | John Norton Mills | 28/8/1959 | MANCH |
+ | Leucanthemum lacustre x maximum = L. x superbum | GB, VC59 South Lancashire, Birkdale | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills | 28/7/1959 | MANCH |
| Plantago lanceolata | GB, VC59 South Lancashire, Ainsdale | John Norton Mills John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 28/7/1959 | K |
+ | Potamogeton compressus | GB, VC59 South Lancashire, Manchester,Droylsden | John Patrick Micklethwait Brenan | John Norton Mills | 27/7/1959 | MANCH |
| Kickxia elatine subsp. elatine | GB, VC41 Glamorganshire, Horton | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 8/9/1958 | K |
| Lamium purpureum var. hybridum | GB, VC41 Glamorganshire, Rhossili | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 4/9/1958 | K |
| Linaria repens | GB, VC41 Glamorganshire, Llanmadoc | John Patrick Micklethwait Brenan Rex Alan Henry Graham | John Patrick Micklethwait Brenan | 31/8/1958 | K |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC41 Glamorganshire, Horton | John Patrick Micklethwait Brenan | | 5/6/1958 | K |
| Mentha spicata x suaveolens = M. x villosa var. alopecuroides | GB, VC41 Glamorganshire, Horton | John Patrick Micklethwait Brenan | | 5/6/1958 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC5 South Somerset, Triscombe | John Patrick Micklethwait Brenan | | 23/9/1957 | K |
| Mentha arvensis x aquatica = M. x verticillata | GB, VC5 South Somerset, Triscombe | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 23/9/1957 | K |
| Mentha x piperita var. vulgaris | GB, VC5 South Somerset, Triscombe | John Patrick Micklethwait Brenan | | 23/9/1957 | K |
| Verbascum virgatum | GB, VC3 South Devon, Man Sands | John Patrick Micklethwait Brenan | | 28/7/1957 | K |
| Luzula forsteri x pilosa = L. x borreri | GB, VC24 Buckinghamshire, Marlow | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills | 7/6/1957 | MANCH |
| Verbascum thapsus | GB, VC34 West Gloucestershire, Wotton Hill | John Patrick Micklethwait Brenan | | 22/8/1956 | K |
| Verbascum thapsus | GB, VC34 West Gloucestershire, Wotton-under-Edge | John Patrick Micklethwait Brenan | | 22/8/1956 | K |
| Plantago arenaria | GB, VC17 Surrey, Kew | John Patrick Micklethwait Brenan | | 12/8/1955 | K |
| Blysmus compressus | GB, VC20 Hertfordshire, Oughtonhead Common | John Patrick Micklethwait Brenan | | 26/6/1955 | K |
| Veronica filiformis | GB, VC3 South Devon, Kilmington | John Patrick Micklethwait Brenan | | 3/7/1954 | K |
| Marrubium vulgare | GB, VC6 North Somerset, Winscombe | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 24/8/1952 | K |
| Festuca arundinacea | GB, VC2 East Cornwall, Portscatho | John Patrick Micklethwait Brenan Richard Alexander Fraser Brenan | | 23/6/1949 | K |
| Stachys sylvatica x palustris = S. x ambigua | GB, VC2 East Cornwall, Saint Mawes | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 23/6/1949 | K |
| Callitriche stagnalis | GB, VC2 East Cornwall, Fowey | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 16/6/1949 | K |
| Groenlandia densa | GB, VC6 North Somerset, Shepton Mallet | John Patrick Micklethwait Brenan | | 12/6/1949 | K |
| Veronica filiformis | GB, VC17 Surrey, Ripley | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 3/5/1949 | K |
| Linaria supina | GB, VC17 Surrey, Kew Cultivated GB, VC2 East Cornwall, Par | John Patrick Micklethwait Brenan | | 1949 | K |
| Linaria supina | GB, VC17 Surrey, Kew Cultivated GB, VC2 East Cornwall, Par | John Patrick Micklethwait Brenan | | 1949 | K |
| Fallopia dumetorum | GB, VC17 Surrey, Wimbledon Common | John Patrick Micklethwait Brenan Noel Yvri Sandwith | John Patrick Micklethwait Brenan | 10/1948 | K |
| Hypochaeris glabra | GB, VC22 Berkshire, Cumnor | E W Jones John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 26/7/1948 | K |
| Carex divulsa | GB, VC29 Cambridgeshire, Cott Farm | John Patrick Micklethwait Brenan | Botanical Society of The British Isles John Patrick Micklethwait Brenan Martin F Gardner & Sabina G Knees | 29/5/1948 | E |
| Potamogeton friesii x crispus = P. x lintonii | GB, VC16 West Kent, River Darent | John Patrick Micklethwait Brenan | Botanical Society & Exchange Club of The British Isles John Patrick Micklethwait Brenan | 17/9/1946 | SLBI |
| Potamogeton friesii x crispus = P. x lintonii | GB, VC16 West Kent, Riverhead | John Patrick Micklethwait Brenan | Job Edward Lousley | 17/9/1946 | SLBI |
| Potamogeton friesii x crispus = P. x lintonii | GB, VC16 West Kent, Riverhead | John Patrick Micklethwait Brenan | John Patrick Micklethwait Brenan | 17/9/1946 | SLBI |
| Myriophyllum verticillatum | GB, VC30 Bedfordshire, Eaton Socon | John Frederick Gustav Chapple John Patrick Micklethwait Brenan | Druce Herbarium, Oxford | 11/8/1946 | SLBI |
+ | Limonium binervosum subsp. anglicum | GB, VC28 West Norfolk, Holme-by-the-Sea | John Norton Mills John Patrick Micklethwait Brenan June R J Mills | John Norton Mills | 8/8/1946 | MANCH |
+ | Melampyrum cristatum | GB, VC29 Cambridgeshire, Hardwick Wood | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills June R J Mills | 7/8/1946 | MANCH |
+ | Melampyrum cristatum | GB, VC29 Cambridgeshire, Hardwick Wood | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills June R J Mills | 7/8/1946 | MANCH |
+ | Melampyrum cristatum | GB, VC29 Cambridgeshire, Hardwick Wood | John Norton Mills John Patrick Micklethwait Brenan | John Norton Mills June R J Mills | 7/8/1946 | MANCH |