The pteridophytes of S?o Tom and Prncipe, Gulf of Guinea: who collected them and where?

Sao Tome and Principe, two islands in the Gulf of Guinea in the Atlantic Ocean off the central west coast of Africa, are well-known for their tropical, albeit substantially transformed, floras. Given the tropical climate prevalent in Sao Tome and Principe, a large component of their floras is comprised of ferns and lycophytes-here collectively referred to as pteridophytes. We provide information on the collectors of pteridophytes in Sao Tome and Principe during the colonial period (from the earliest times up to 1975). New information on these collectors and their collections are provided, and some of the doubts that existed about localities where pteridophytes were collected are solved.