Cystopteris tenuis (Michx.) Desv.
Mackay’s fragile fern
[An article has not been written yet.]
Cystopteris fragilis (L.) Bernh. var. mackayi G. Lawson
6/9/2026 · Glen Ellis Falls, Pinkham Notch, New Hampshire · ≈ 10 × 7″ (25 × 17 cm) 
| Kingdom | Plantae | Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin) |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Pteridophyta | Ferns |
| Class | Filicopsida | “Leptosporangiate” (has to do with how their spores form) ferns—includes most ferns |
| Order | Polypodiales | Polypod ferns |
| Family | Dryopteridaceae | Wood ferns (about 70% of the ferns) |
| Genus | Cystopteris | From Greek kystis, ”bag,“ and pteris, ”wing“ or ”fern,“ alluding to the sack-like covering of the sori |
| Species | tenuis |
Cystopteris tenuis description by Thomas H. Kent, not updated.
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