@mastersthesis {909,
	title = {The lichen genus Ramalina Ach. in the West Indies with notes on its role in the vegetation of Puerto Rico.},
	year = {1972},
	pages = {342},
	school = {Michigan State University},
	type = {PhD dissertation},
	address = {East Lansing},
	author = {Ladron Concepcion, I.}
}
