Cystopteris laurentiana

Cystopteris laurentiana, commonly called Laurentian bladderfern or St. Lawrence bladderfern, is a species of fern in the family Cystopteridaceae.^[1] It is native to eastern North America, primarily in the Great Lakes-St. Lawrence lowlands, but there are also scattered occurrences in New England and Atlantic Canada.^[2] It grows on cliffs composed of calcareous rocks, such as limestone, dolostone and diabase.^[2][3][4]

Cystopteris laurentiana
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Order:	Polypodiales
Suborder:	Aspleniineae
Family:	Cystopteridaceae
Genus:	Cystopteris
Species:	C. laurentiana
Binomial name
Cystopteris laurentiana (Weath.) Blasdell
Synonyms
Cystopteris fragilis var. laurentiana Weath. Cystopteris × tennesseensis subsp. laurentiana (Weath.) Windham

Taxonomy

Cystopteris laurentiana is a fertile allohexaploid hybrid between C. bulbifera (bulblet fern) and C. fragilis (fragile fern).^[2] The scientific name is therefore sometimes written as C. × laurentiana, which denotes hybrid origin.