California Creek. Ulothrix, an unbranched filamentous green alga, was most abundant 

 at the upper site, followed by the chrysophyte Hydrurus foetidus (Table 3). H. foetidus forms 

 slimy, mucilaginous colonies in clear, cold streams in full sunlight. It is known for the offensive 

 odor that it emits. Diatoms were common and ranked third in biovolume at the upper site. Near 

 the mouth of California Creek, diatoms were abundant and ranked first in biovolume. Ulothrix 

 and Hydrurus were absent at the lower site and were replaced by a more conventional algal flora. 

 Here the cyanophyte Osciallatoria and the filamentous green alga Cladophora ranked second 

 and third in biovolume, respectively. 



Harris Creek. The most abundant alga here was the xanthophyte Vaucheria, which 

 indicates a steady flow of water. Diatoms were frequent and ranked second. Common genera of 

 green and blue-green algae were also found here (Table 3). 



Shovel Creek. The filamentous cyanophyte Oscillatoria was the only non-diatom alga 

 found at this site (Table 3). Diatoms were abundant and ranked first in biovolume. 



Hawkeye Creek. Cladophora dominated the sample from Hawkeye Creek (Table 3). 

 Vaucheria was frequent and ranked second in biovolume, while diatoms were also frequent and 

 ranked third. Two other genera of green algae completed the periphyton community at this site. 



Warm Springs Creek. The macrophytic green alga Chara dominated the sample from 

 this site (Table 3). Dominance by this alga indicates a stream with hard waters, gentle gradient, 

 slow current velocity, and a muddy bottom. The nitrogen-fixing cyanophyte Nostoc was also 

 abundant here, indicating that nitrogen may be the limiting nutrient at this site. A total of 8 

 genera of green and blue-green algae comprised the non-algal flora here. 



Mill Gulch. Diatoms and an occasional cell of the desmid Closterium were the only 

 algae found in the sample from Mill Creek (Table 3). 



Garden Creek. The upper and lower sites on Garden Creek had very similar algal floras 

 (Table 3). Diatoms ranked first in biovolume at both sites, followed by the cyanophyte 



