Diatoms of North AmericaDiatoms of North America
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Compare Ulnaria capitata

(Ehrenb.) Compère 2001

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Ulnaria ulna var. spathulifera has a central area and more gradually expanded valve margins, terminating in rostrate apices.

LM scalebar = 10 µm
Ulnaria Capitata LM1 Ulnaria Capitata LM3 Ulnaria Capitata LM2 Ulnaria Capitata LM1 Ulnaria Capitata LM4 Ulnaria Capitata LM5 Ulnaria Capitata LM7
Length Range
260-480 µm
Width Range
8-9.5 µm
Striae in 10 µm
9-11

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Ulnaria ulna var. spathulifera

BioData Reference
Patrick and Reimer 1966 Pl 7 Fig 8