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Thomas Lobb (1817–1894) was a British botanist and, along with his older brother, William Lobb, collected plants for the plant nursery Veitch.
Lobb worked in India, the Dutch East Indies and the Philippines. In 1845 he discovered the first orchid species of the genus Phalaenopsis growing in the eastern Himalayas, at an altitude of ~1,500 m (4,900 ft). This plant, Phalaenopsis lobbii, is named in his honour as was Dendrobium lobbii.