Phylum: Heterokontophyta

Taxon: Asterionella formosa

Site: Lone Lake, Island County, WA

Comments: Moderately common in Lake Chelan; very common in spring diatom blooms in freshwater lakes and ponds.

Phylum: Heterokontophyta

Taxon: Asterionella formosa

Site: Lone Lake, Island County, WA

Comments: Moderately common in Lake Chelan; very common in spring diatom blooms in freshwater lakes and ponds.

Phylum: Heterokontophyta

Taxon: Diatoma

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

Comments: Very common in Lake Chelan; probably common in many freshwater lakes and ponds. Sample preserved in formalin.

Phylum: Heterokontophyta

Taxon: Diatoma

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

Comments: Very common in Lake Chelan; probably common in many freshwater lakes and ponds.

Phylum: Heterokontophyta

Taxon: Fragilaria capucina

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

Comments: Moderately common in Lake Chelan and in many freshwater lakes and ponds.

Phylum: Heterokontophyta

Taxon: Fragilaria crotonensis

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

Comments: Very common in Lake Chelan and in many freshwater lakes and ponds; often planktonic.

Phylum: Heterokontophyta

Taxon: Fragilaria cf. pennsylvanica

Site: Roses Lake, Chelan County, WA

Comments: Not observed in the 2023-2025 Lake Chelan samples. Sample preserved in formalin.

Phylum: Heterokontophyta

Taxon: Hannaea

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

Comments: Uncommon in Lake Chelan; probably moderately common in many freshwater lakes and ponds. Sample preserved in formalin.

Phylum: Heterokontophyta

Taxon: Odontidium

Site: Crystal View Estates Marina, Lake Chelan, Chelan County, WA

Comments: Very common in Lake Chelan, but easily overlooked due to small size; common in many freshwater habitats.

Phylum: Heterokontophyta

Taxon: Synedra

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

Comments: Moderately common in Lake Chelan; common in many freshwater lakes and ponds; often planktonic. Sample preserved in formalin.

Phylum: Heterokontophyta

Taxon: Tabellaria fenestrata

Site: Crystal View Estates Marina, Lake Chelan, Chelan County, WA

Comments: Common in Lake Chelan and in many freshwater lakes and ponds; often planktonic.

Phylum: Heterokontophyta

Taxon: Tabellaria flocculosa

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

Comments: Common in Lake Chelan and in many freshwater lakes and ponds; often planktonic.

Phylum: Heterokontophyta

Taxon: Ulnaria capitata

Site: Lowry property, Lake Chelan, Chelan County, WA

Comments: Common in Lake Chelan and in many freshwater lakes and ponds; often planktonic.

Phylum: Heterokontophyta

Taxon: Ulnaria cf. contracta

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

Comments: Uncommon in Lake Chelan. Sample preserved in formalin.

Phylum: Heterokontophyta

Taxon: Ulnaria cf. delicatissima

Site: Crystal View Estates Marina, Lake Chelan, Chelan County, WA

Comments: Common in Lake Chelan; often planktonic. Sample preserved in formalin.