Compare Gomphonema californicum
Gomphonema dichotomum is lanceolate-linear valve with predominantly concave sides, a smaller central area and lower stria density (9-11 in 10 µm).
Gomphonema grasmueckii has very small central area, strongly radiate striae near the center and lower stria density (9-12 in 10 µm).
LM scalebar = 10 µm
Length Range
22-69 µm
22-69 µm
Width Range
5.6-8.3 µm
5.6-8.3 µm
Striae in 10 µm
10-15
10-15
