Hermann Edward Hasse (12 January 1836 – 29 October 1915) was an American lichenologist.[1] [2] He wrote two important texts and numerous articles in his field.[3] Hassea, which is a genus of fungi in the class Dothideomycetes,[4] and Lecidea hassei, a lichen that grows inside solid rock (endolithic lichen), were both named in his honor.[3] He principally did his research in southern California. His correspondents included cryptogamic botanist William Gilson Farlow and lichenologist George Knox Merrill.
In 1913, Hasse published The Lichen Flora Of Southern California, a flora of the lichens of southern California covering about 400 taxa.[1] Lichenologist Kerry Knudsen described it as "historic" in the lichenology journal Opuscula Philolichenum.,[1] written by Hermann Edward Hasse.[1] He also wrote the earlier Lichens of Southern California, published in 1898, and 30 other papers and notes on lichens, many published in The Bryologist.[1]