Kützing 1849 Category: Asymmetrical biraphid
BASIONYM: Gomphonema brebissonii Kützing 1849
SYNONYM(S): Gomphonema acuminatum var. brebissonii (Kützing) Grunow in Van Heurck 1880
Contributor: Pat Kociolek - September 2011
Length Range: 17-48 µm
Width Range: 6-9 µm
Striae in 10 µm: 9-12
Valves bluntly acuminate, with the headpole protracted and bluntly rounded. Valve biconstricted, broadest near the headpole, but tumid at the center of the valve. The footpole is rounded. The axial area is straight and distinct, but the central area is barely differentiated. The raphe is lateral and undulate. The striae are radiate about the center, become parallel towards the headpole, and may become convergent at the apex. Striae are parallel becoming strongly radiate at the footpole. About the center of the valve the central striae on either side of the axial area are separated more from those next to them. One of the central striae terminate next to an isolated stigma. Apical pore fields are distinct at the footpole.
Basionym: Gomphonema brebissonii
Author: Kützing 1849
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.