James Townsend Mackay
James Townsend Mackay (1775–1862) was a Scottish botanist who lived in Ireland.
He visited the west of the island in 1804 and 1805, and as a result published a 'Catalogue of the Rarer Plants of Ireland' in the Transactions of the Royal Dublin Society for the following year. This catalogue he enlarged into the 'Catalogue of the Indigenous Plants of Ireland,' published in 1825 in the Transactions of the Royal Irish Academy, which was again the basis of his Flora Hibernica, published in 1836, the cryptogamic portion of which was by Drs. Harvey and Taylor. 
The governors of Trinity College, Dublin, having determined to establish a botanical garden, Mackay was recommended to them as a curator, and he held the post from 1806 until his death. Soon after his appointment he was elected an associate of the Linnean Society, and in 1850 the university of Dublin bestowed upon him the degree of LL.D. He was attacked by paralysis about 1860, and died of bronchitis in Dublin 25 February 1862.
Mackay discovered several species of plants new to the British Isles, and contributed largely to Sir J. E. Smith's English Botany (1790-1814). His herbarium is preserved at Dublin. Several unsuccessful attempts were made to perpetuate his name, which is now borne by a genus of seaweeds, Maekaya, so named by Dr. Harvey, and by a species of heath, Erica Mackaiana. 
- Flora Hibernica: comprising the Flowering plants, Ferns, Caraceae, Musci, Hepaticae, Lichenes and Algae of Ireland.(William Curry Jun and Company, Dublin, 1836).  Full text.
This article incorporates text from a publication now in the public domain: Boulger, George Simonds (1893). "Mackay, James Townsend". In Lee, Sidney. Dictionary of National Biography. 35. London: Smith, Elder & Co.
- University of Dublin; History, with Biographical Notices. William B. S. Taylor. London, 1845.