1. Notes on the plants gathered in 1879;Bailey;Rep. Botl. Exch. Club Brit Is,1880
2. The use of spore morphology as a taxonomic tool in the delimitation of the southern African species of Ophioglossum L;Burrows,1997
3. A monograph of the Ophioglossaceae;Clausen;Memoirs of the Torrey Botanical Club,1938
4. Sur l'Ophioglossum de Lardy et du Cap Ferret. Bulletin;Durieu de Maisonneuve,1857
5. Some remarks on terms, diagnosis, classification and methods in palynology;Erdtman;Sven. Bot. Tidskr.,1954