Thelypteridaceae
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Marsh fern family
Thelypteridaceae
ヒメシダ科
A large family including many genera such as Thelypteris, Stegnogramma, and Onoclea. Widely distributed in wetlands, waterside habitats, and montane forest floors, with many common species in Japan. A distinctive feature is the anastomosis of opposing veinlet tips.
Key Characteristics
- ●Tips of opposing veinlets anastomosing (connecting veins)
- ●Sori covered by round to reniform indusia (or exindusiate)
- ●Fronds 1- to 2-pinnate
- ●Hairs (acicular hairs to scales) often well-developed
Phylogenetic Position
Vascular plants > Polypodiophyta > Polypodiopsida > Polypodiales > Thelypteridaceae
Divergence Era
Cretaceous (ca. 90 million years ago–)
Representative Genera
ヒメシダ属（Thelypteris）ミゾシダ属（Stegnogramma）コウヤワラビ属（Phegopteris）
Related Evolution Events
- ・Evolution of connecting veins (anastomosis of opposing veinlets)
- ・Specialization for wetland and waterside environments
Plants in Marsh fern family on this site
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