''Cystopteris fragilis'' is a species of

fern A fern (Polypodiopsida or Polypodiophyta ) is a member of a group of vascular plants (plants with xylem and phloem) that reproduce via spores and have neither seeds nor flowers. The polypodiophytes include all living pteridophytes exce ...

known by the common names brittle bladder-fern and common fragile fern. It can be found worldwide, generally in shady, moist areas. The leaves are up to 30 or 40 centimeters long and are borne on fleshy petioles with few or no long hairs. Each leaf is divided into many pairs of leaflets, each of which is subdivided into lobed segments. The underside of the leaf has many rounded sori containing the

sporangia A sporangium (; from Late Latin, ) is an enclosure in which spores are formed. It can be composed of a single cell or can be multicellular. Virtually all plants, fungi, and many other lineages form sporangia at some point in their life cyc ...

References

External links

Jepson Manual Treatment: ''Cystopteris fragilis''USDA Plants Profile: ''Cystopteris fragilis''Flora of North America: ''Cystopteris fragilis''''Cystopteris fragilis'' — U.C. Photo gallery
fragilis Ferns of Asia Ferns of Europe Ferns of the Americas Ferns of Canada Ferns of the United States Ferns of California Flora of England Flora of Finland Flora of Lebanon Flora of Russia Flora of the Sierra Nevada (United States) Flora of South Georgia Island Biota of South Georgia and the South Sandwich Islands Plants described in 1805 {{Polypodiales-stub