Brittle Bladderfern
Cystopteris tenuis (Michx.) Desv.
Cystopteris tenuis, known as Brittle Bladderfern, is a fern species in the Cystopteridaceae family. It was previously grouped with Cystopteris fragilis as Cystopteris fragilis (L.) Bernh. var. mackayi Lawson. The species was formally described in 1827.
Description
Cystopteris tenuis is a fern species native to regions including New Brunswick, Nova Scotia, Ontario, Quebec, Vermont-US, Alabama, Arizona, Arkansas, Colorado, Connecticut, Delaware, District of Columbia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, and Maryland. It is also known as Mackay's bladder fern or Mackay's fragile fern. Historically, it was considered part of the Cystopteris fragilis superspecies complex before being recognized as a distinct species.
Other common names
Brittle BladderfernMackay'S Brittle FernMackay'S FernMackay'S Fragile FernUpland Brittle Bladder FernUpland Brittle Bladderfern
Distribution
New Brunswick · Nova Scotia · Ontario · Quebec · Vermont-US · Alabama · Arizona · Arkansas · Colorado · Connecticut · Delaware · District of Columbia · Illinois · Indiana · Iowa · Kansas · Kentucky · Louisiana · Maine · Maryland · Massachusetts · Michigan · Minnesota · Mississippi · Missouri · Nebraska · Nevada · New Hampshire · New Jersey · New Mexico
Synonyms
Aspidium tenuePolypodium tenueCystopteris fragilis var. mackayiNephrodium tenueAthyrium tenueCystopteris filix-fragilis var. tenuisCystopteris filix-fragilis var. mackayi