In 1973, he took part in the Qinghai - Tibet Expedition, during which he discovered and named the Tibetan elm, Ulmus microcarpa.
microcarpa, grafted cutting, Bonte Hoek nursery, Glimmen, NL.
Ulmus americana | Ulmus parvifolia | Ulmus minor | Ulmus mexicana | ''Ulmus davidiana'' var. ''japonica'' | Ficus microcarpa | Ulmus 'Sapporo Autumn Gold' | Ulmus procera | Ulmus microcarpa | Ulmus × hollandica | Ulmus 'Hoersholmiensis' | Ulmus 'Commelin' | Ulmus americana 'Patmore' |