ID 1

Idaho Site, Ada Co., Idaho, USA.  Along Bogus Basin Rd., 1.5 km from Hill Rd. intersection, (Boise Foothills).  43° 39.777' N latitude, 116°11.222' W longitude; elevation 3200 feet.   Date of sampling: 29 June 1999.

Dominant vascular plants:  Purshia tridentata, Chrysothamnus nauseosus ssp. albicaulis, Artemisia tridentata ssp. tridentata, Aristita longistada, Stipa thunbergiana, Bromus tectorum, Achillia millifolia, Eriogonum oralofolium, Phacelia heterophylla, Antenaria microphyllum.

Mean lichen crust thickness:  13.8 mm
Mean moss crust thickness:  15.4 mm

Cover summary:

Type Cover                % Cover
Shrubs                               0.0
Annual grasses                9.6    
Perennial grasses          22.4
Perennial forbs                6.8
Algal crust                        0.0
Bryophytes                     20.0
Lichens                            14.4
Bare Soil                            4.4
Rock                                   0.0
Gravel                                2.4 
Litter                                20.0
Cactus                                0.0

Chlorophyll a (ng/g):
N fixation rate (mmole/n2/m2/hr): 67.60
Soil texture class: loamy sand

ID 2

Idaho Site, Owyhee Co., Idaho, USA.  South of SR 78, vicinity of West Rabbit Creek.  43° 18.212' N latitude, 116° 35.488' W longitude; elevation 2400 feet. Date of sampling:  1 July 1999.

Dominant vascular plants:  Artemisia tridentata ssp. tridentata, Stipa hymenoides, Bromus tectorum, Sarcobatus vermiculatus (Greasewood), Poa sandbergii.

Mean algal crust thickness: 10.2 mm
Mean moss crust thickness: 14.2 mm

Cover summary:

Type Cover                % Cover
Shrubs                               0.4
Annual grasses                1.6    
Perennial grasses            0.0
Perennial forbs                0.0
Algal crust                      41.6
Bryophytes                       3.6
Lichens                              2.4
Bare Soil                            0.0
Rock                                   8.0
Gravel                              30.0 
Litter                                12.4
Cactus                                0.0

Chlorophyll a (ng/g):
N fixation rate (mmole/n2/m2/hr): 20.80
Soil texture class:  sandy loam

ID 3

Idaho Site, Elmore Co., Idaho, USA.  North of I-84, at Bowns Creek Exit (along old Boise Road).  Wyoming sage - Blue bunch wheat grass habitat type.  43° 20.532' N latitude, 115° 55.992' W longitude; elevation 3600 feet.  Date of sampling:  29 June 1999. 

Dominant vascular plants:  Artemisia tridentata ssp. wyomingensis, Bromus tectorum, Elymus canadensis, Festuca octoflora, Poa sandbergii, Sitantion hystrix.

Mean algal crust thickness: 11.2 mm
Mean moss crust thickness: 15.2 mm

Cover summary:

Type Cover                % Cover
Shrubs                               0.0
Annual grasses                2.0    
Perennial grasses            6.4
Perennial forbs                0.0
Algal crust                      21.6
Bryophytes                     28.8
Lichens                            27.6
Bare Soil                            0.0
Rock                                   0.0
Gravel                                1.2 
Litter                                 13.6
Cactus                                0.0

Chlorophyll a (ng/g):
N fixation rate (mmole/n2/m2/hr): 66.59
Soil texture class:  loam

ID 4

Idaho site, Lemhi County, Leadore, Idaho, USA.   Leadore ranger district office.  Date of sampling:  23 August 1999.

Dominant vascular plants:  

Mean algal crust thickness: 
Mean moss crust thickness: 

Cover summary:

Type Cover                % Cover
Shrubs                               
Annual grasses                    
Perennial grasses            
Perennial forbs                
Algal crust                      
Bryophytes                     
Lichens                            
Bare Soil                           
Rock                                   
Gravel                                 
Litter                                 
Cactus                                

Chlorophyll a (ng/g):
N fixation rate (mmole/n2/m2/hr): 
Soil texture class: sandy loam