Grunow 1880 Category: Asymmetrical biraphid
BASIONYM: Gomphonema acuminatum var. pusilla Grunow in Van Heurck 1880
SYNONYM(S): Gomphonema montanum var. pumila (Grunow in Van Heurck) Tempère and Peragallo 1908
Contributor: Pat Kociolek - September 2011
Length Range: 32-56 µm
Width Range: 6.5-9.0 µm
Striae in 10 µm: 11-13
Valves are linear-acute and biconstricted, with the broadest portion of the valve near the headpole. The center of the valve is slightly tumid and the headpole is acute. The axial area is straight with the central area barely differentiated and transverse. The raphe is lateral and undulate. Striae are punctate. Striae are radiate about the middle portion of the valve, becoming parallel to radiate towards the headpole and parallel to strongly radiate at the footpole. Striae at the central area are slightly more separate from the others. On one side of the central area a stria is reduced in length, on the other side the central stria terminates at the rounded stigma.
Basionym: Gomphonema acuminatum var. pusilla
Author: Grunow in Van Heurck 1880
Length Range: µm
Striae in 10 µm:
Patrick, R.M. and Reimer, C.W. (1975). The Diatoms of the United States, exclusive of Alaska and Hawaii, V. 2. Monographs of the Academy of Natural Sciences of Philadelphia 13.
Reichardt, E. (1999). Zur Revision der Gattung Gomphonema. Iconographia Diatomologica, 8. Koeltz Scientific Books, Frankfurt.