The Dryopteris spinulosa complex in Finland
By: by Carl-Johan Widén, Jaakko Sarvela and Teuvo Ahti.
Contributors: Sarvela, Jaakko, joint author.; Ahti, Teuvo, 1934-
Series: Acta botanica Fennica,; 77
Publisher: Societas pro Fauna et Flora Fennica
Published: 1967
Place of publication: Helsinki
Language: eng
Number of pages: 24
Subjects: Dryopteris.; Ferns -- Finland.; Plant morphology.
Notes: Bibliography: p. 16-18.