蚌壳蕨属（学名：Dicksonia）是一属蕨类。它们与桫椤属有亲缘关系，但却较为原始，最少可以追溯至侏罗纪及白垩纪。它们的化石纪录有茎、叶子及孢子。

蚌壳蕨属包含了20-25个物种，分布在墨西哥至乌拉圭及智利、圣赫勒拿岛、新西兰、澳洲、印尼、新畿内亚及菲律宾。在新畿内亚的物种最为多样化，共有5个物种。所有物种中最为容易种植的是软树蕨。

蚌壳蕨属最初是由Charles Louis L'Héritier de Brutelle于1788年描述，其学名是为纪念植物学家詹姆斯·迪克森（James Dickson）。

Dicksonia is a genus of tree ferns in the order Cyatheales. It is regarded as related to Cyathea, but is considered more primitive, dating back at least to the Jurassic and Cretaceous periods. The fossil record includes stems, pinnules, and spores.

The genus contains 20-25 species, distributed from Mexico to Argentina, Uruguay and Chile, St. Helena, New Zealand, New Caledonia, Australia, Indonesia, New Guinea, and the Philippines. New Guinea has the greatest diversity, with five species.