Thelypteris pilosa var. alabamensis
|Alabama streak-sorus fern|
|Anna W. Strong and Alfred Schotz|
The following Participating Institutions are custodians for this species in the CPC National Collection:
Cincinnati Zoo & Botanical Garden
The conservation of Thelypteris pilosa var. alabamensis is fully sponsored.
Anna W. Strong and Alfred Schotz contributed to this Plant Profile.
Alabama streak-sorus fern is a small evergreen fern named for its arrangement of sori in streaks (spore-producing sacs on the leafs under surface). After the only known locality in Winston County, Alabama was destroyed by bridge construction in 1960 (Dean 1969), the fern was eventually rediscovered in 1975 (Short and Freeman 1978). The fern is currently known to occur along four miles of the Sipsey Fork (Gunn 1991, 1994) and largely falls within William Bankhead National Forest.
Distribution & Occurrence
In sandstone rockhouses and exposed cliff faces on the Sipsey Fork, a tributary of the Black Warrior River. The rockhouses create a microclimate with constant moisture and temperature that allows for a unique association of temperate plants.
|17 occurrences along a 4 mile stretch of the Sipsey Fork (Gunn 1991, 1994).|
Conservation, Ecology & Research
Logging could lead to changes in habitat hydrology and solar radiation (USFWS 1996).
Recreational user impacts (USFWS 1996).
Watkins and Farrar (2005) self-fertilized Alabama streak-sorus ferns and produced a small number of adult plants, however, cross-fertilizations resulted in no adult plants.
Enzyme analysis showed low genetic variation among different locations of Alabama streak-sorus fern (Watkins and Farrar 2005).
Dean, B.E. 1969. Ferns of Alabama. Birmingham, AL. Southern University Press.