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Diatoms of North America
Practitioners
Morphology
Centric
Araphid
Eunotioid
Symmetric Biraphid
Monoraphid
Asymmetric Biraphid
Epithemioid
Nitzschioid
Surirelloid
Genera
Species
Glossary
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Projects
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What are diatoms?
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A_alpigena_collum.jpg
Glossary Term
Collum
Caption
In this light micrograph, each arrow shows the collum on two valves of a single frustule in
A. alpigena
.
Credit
Marina Potapova
