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Gomphonema coronatum is longer, and proportionately more slender than G. acuminatum, with which it was for many years considered part of that species complex. Gomphonema coronatum is more curved and broader near the headpole than G. elongatum.

LM scalebar = 10 µm
Coronatum Gc4367A006 Coronatum Gc4367A007 Coronatum Gc4367A003 Coronatum Gc1283004 Coronatum Gc1283002 Coronatum Gc1283001
Length Range
34-108 µm
Width Range
8-13 µm
Striae in 10 µm
8-12, approaching 15/10 ┬Ám at the footpole

Gomphonema acuminatum

Ehrenb. 1832

Gomphonema Acuminatum 002 Gomphonema Acuminatum 001 Gomphonema Acuminatum 003 Gomphonema Acuminatum 005 Acuminatum Gc109928B004 Gomphonema Acuminatum 004
Length Range
19-77 µm
Width Range
7-12 µm
Striae in 10 µm
9-12 at the center, 12-14 towards the footpole

Gomphonema elongatum

W.Sm. 1855

Acuminatumelongatum Wsmith 317003 Acuminatumelongatum Wsmith 317002 Acuminatumelongatum Wsmith 317004 Acuminatumelongatum Wsmith 317007 Acuminatumelongatum Wsmith 317005 Acuminatumelongatum Wsmith 317006
Length Range
40-105 µm
Width Range
7-11 µm
Striae in 10 µm
13-15