ATTACHMENT SS2

REGION 2 SENSITIVE SPECIES EVALUATION FORM

Species: watsonii / Watson’s Spike-moss

Criteria Rank Rationale Literature Citations Watson’s Spike-moss occurs in the Beartooth Mountains in Park County, Wyoming, on • Dorn 2001 1 A the Shoshone National Forest. It is not known from any other Region 2 state. Distribution • Dorn and Dorn 1972 within R2 • Fertig 1995, 1998 This species is found on granitic cliffs and rocky slopes at 9,950 to 10,600 feet. Its • Markow and Fertig 1999 range in the state very limited. • University of Wyoming 1998

Confidence in Rank High Watson’s Spike-moss is known from and Oregon, east to Montana, Utah, • Dorn and Dorn 1972 2 B Nevada, and Arizona. Distribution • Flora of North America outside R2 Committee 1993 • Hitchcock and Cronquist 1969 Confidence in Rank High Dispersal vectors are unknown. • - 3 D Dispersal Capability

Confidence in Rank High Watson’s Spike-moss is known from a single occurrence in Wyoming, on the • Markow and Fertig 1999 4 A Shoshone National Forest. It was last observed in 1985. Until 1994, this population Abundance in • University of Wyoming 1998 R2 was thought to represent Selaginella densa. Census data are not available, but the • USDA Forest Service 2001 single known occurrence occupies a small area. This species is ranked “S1” in • WYNDD 2002 Wyoming.

Confidence in Rank High Not known, but presumed to be stable at the present time. • Markow and Fertig 1999 5 D Population Trend in R2

Confidence in Rank High Not known. • - 6 D Habitat Trend in R2

Confidence in Rank High

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Species: Selaginella watsonii / Watson’s Spike-moss

Criteria Rank Rationale Literature Citations Threats are probably low due to this species rugged habitat although the one site in • Markow and Fertig 1999 7 CD Wyoming does receive high recreation use. Watson’s Spike-moss occurs on lands Habitat • WYNDD 2002 Vulnerability managed for multiple use by the Shoshone National Forest. or Modification Confidence in Rank High Watson’s Spike-moss is a densely matted perennial. Spores are produced from July • Flora of North America 8 D through September. Life History Committee 1993 and • Hitchcock and Cronquist 1969 Demographics Additional information on the species, including longevity, mortality, and spore biology, • Markow and Fertig 1999 are not available.

Confidence in Rank High Initial Evaluator(s): Date: May 14, 2002 Joy Handley, Bonnie Heidel and Scott Laursen

National Forests in the Rocky Mountain Region where species is KNOWN (K) or LIKELY(L)1 to occur:

1 Likely is defined as more likely to occur than not occur on the National Forest or Grassland. This generally can be thought of as having a 50% chance or greater of appearing on NFS lands.

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Colorado NF/NG Kansas NF/NG Nebraska NF/NG Wyoming NF/NG

NF/NG

y y

y y y Known Likel Known Likel Known Likel Known Likel Known Likel Arapaho-Roosevelt NF Cimmaron NG Samuel R.McKelvie NF Black Hills NF Shoshone NF X White River NF Halsey NF Buffalo Gap NG Bighorn NF Routt NF Nebraska NF Ft. Pierre NG Black Hills NF Grand Mesa, Ogalala NG Medicine Bow NF Uncompahgre, Gunnison NF San Juan NF Thunder Basin NG Rio Grande NF Pike-San Isabel NF Comanche NG

Literature cited Dorn, R.D. 2001. Vascular of Wyoming, third edition. Mountain West Publishing, Cheyenne, WY.

Dorn, R.D. and J. Dorn. 1972. Ferns and other Pteridophytes of Montana, Wyoming, and the Black Hills of South Dakota.

Fertig, W. 1995. More new species for Wyoming. Castilleja 14(1): 4-5.

Fertig, W. 1998. The status of rare plants on Shoshone National Forest: 1995-97 survey results. Report prepared by the Wyoming Natural Diversity Database, Laramie, WY.

Flora of North America Editorial Committee. 1993. Flora of North America North of Mexico. Vol. 2 Pteridophytes and Gymnosperms. Oxford Univ. Press, New York.

Hitchcock, C.L., A. Cronquist, and M. Owenbey. 1969. Pt. 1. Vascular Cryptograms, Gymnosperms, and Monocotyledons, IN: Hitchcock, C.L., A. Cronquist, M. Owenbey, and J.W. Thompson (eds). Vascular Plants of the Pacific Northwest. University of Washington Publications in Biology 17(1): 1- 914.

Markow, S. and W. Fertig. 1999. State Species Abstract: Selaginella watsonii. Wyoming Natural Diversity Database. Available on the internet at www.uwyo.edu/wyndd

University of Wyoming – Rocky Mountain Herbarium. 1998. Atlas of the Flora of Wyoming. Posted electronically through 1998 at: http://www.esb.utexas.edu/tchumley/wyomap/ and unposted accession information at the Rocky Mountain Herbarium through 2001.

USDA Forest Service – Region 2. 2001. “Wyoming plant species” evaluation list and criteria provided to Wyoming Natural Diversity Database. Denver, CO.

USDA-Forest Service R2 Sensitive Species Evaluation Form Page 3 of 4 ATTACHMENT SS2 Wyoming Natural Diversity Database. 2002. Ongoing documentation of sensitive species distribution, biology, status, and references for the state of Wyoming. University of Wyoming, Laramie.

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