Phylum: Heterokontophyta

Taxon: Cylindrotheca gracilis

Site: Purtteman Creek at confluence with Lake Chelan, Chelan County, WA

Comments: Uncommon in Lake Chelan and elsewhere; cells have twisted raphe that is difficult to see because the cell wall is very thin. Sample preserved in formalin.

Phylum: Heterokontophyta

Taxon: Hantzschia amphioxys

Site: Crystal View Bay, Lake Chelan, Chelan County, WA

Comments: Moderately common in Lake Chelan; raphe is off-set to one side of valve.

Phylum: Heterokontophyta

Taxon: Nitzschia

Site: Congdon Bay, Lake Chelan, Chelan County, WA

Comments: Moderately common in Lake Chelan; raphe is off-set to one side of valve.

Phylum: Heterokontophyta

Taxon: Nitzschia

Site: Purtteman Creek at confluence with Lake Chelan, Chelan County, WA

Comments: Moderately common in Lake Chelan; raphe is off-set to one side of valve.

Phylum: Heterokontophyta

Taxon: Nitzschia

Site: Sunset Marina, Lake Chelan, Chelan County, WA

Comments: Moderately common in Lake Chelan.