Louis Hermann Pammel
…Ecology 10(2): 251-256. Pammel, Louis H. and Charlotte M. King (1930?) Honey Plants of Iowa. Iowa Geological Survey [incomplete citation] Sources: http://www.public.iastate.edu/~isu150/history/pammel.htmlaccessed on 19 July 2017. 2. http://www.waysofenlichenment.net/lichens/Bacidia%20coprodes accessed…