The Northwest European Pollen Flora, 69: Ophioglossaceae

LiteratureBurrows, 1997, Erdtman, 1954, Erdtman, 1957, Erdtman and Sorsa, 1971, Goswami and Khandelwal, 1973, Haeggström and Niemi, 1965, Kato, 1987, Knox, 1951, Kremp and Kawasaki, 1972, Kuprianova and Alyoshina, 1972, Kurita, 1981, Lugardon, 1972, Marengo, 1956, Morbelli, 1983, Nakamura and Shibaski, 1959, Pant and Khare, 1971, Pant and Misra, 1976, Paul, 1987, Pettitt, 1979, Pant and Misra, 1976, Sahashi, 1976, Sahashi, 1978, Sahashi, 1979, Sahashi, 2000, Sladkov, 1959, Tryon, 1986, Tryon and Lugardon, 1991 and Watkins and Dute, 1986.