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Image: Wikimedia Commons (See link for license)
Maidenhair Spleenwort
Asplenium trichomanes
チャセンシダ
A fern growing in crevices of rock walls and stone walls in mountain areas across Japan. Named for its narrow fronds spreading radially like a 'chasen' (bamboo tea whisk). Evergreen, growing in rock crevices.
Identification Points
- ✓Fronds linear, once-pinnately compound
- ✓Rachis dark brown to black with a glossy sheen
- ✓Grows in rock crevices and on stone walls
Habitat
Rock walls, stone walls, and rock crevices in mountain areas
Season
Year-round (evergreen)
Morphological TraitsAI-estimated, needs verification
Leaf arrangement
Alternate
Leaf type
Compound
Venation
Pinnate
Leaf margin
Entire
Leaf shape
Linear
Growth form
Herb
Phylogenetic Positionチャセンシダ科 →
Phylogenetic Position
Vascular plants > Polypodiophyta > Polypodiopsida > Polypodiales > Aspleniaceae
Divergence Era
Jurassic to Cretaceous (ca. 150 million years ago–)
Evolution Notes
Aspleniaceae is a fern group specialized for lithophytic growth on rocks; the glossy dark rachis is associated with desiccation tolerance.
View on evolution timeline →Sources & References
AI-generated, needs verification