Cystopteris tenuis (Michx.) Desv. - Mackay's Fragile Fern


 

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Cystopteris tenuis - (image 1 of 4)

 

Taxonomy

Family: Woodsiaceae

Habitat

Cliffs, rocky slopes, talus.

Associates

 

Distribution

Nova Scotia, New Brunswick and southern Quebec to MN and NE, south to VA, southern IL, and MO, and in mountains to northern GA.

Morphology

Leaves deciduous, stems brittle; basal pinnules tapering to the base; indusium about 0.5 mm to nearly obsolete, usually entire.      

Notes

Spores produced late May to early August.

Wetland indicator: NA

Similar to C. fragilis which has basal pinnules that are more or less sessile and has a more northern distribution. Previously treated as a variety of that species, C. fragilis var. mackayi G. Lawson.

References

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY

 


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 Michael Hough 2018