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Ceterach officinarum bivalens

DINO MARCHETTI (editor) -Pteridologic Italian notes. VI (134-155). In this paper twenty-one Pteridophytes are treated. Isoetes echinospora Durieu, Cosentinia vellea (Aiton) Tod. subsp. bivalens (Reichst.) Rivas Mart. et Salvo, Cheilanthes guanchica Bolle and Polystichum x illyricum (Borbás) Hahne are the most important of all.