Edlund and Brant 1997 Category: Symmetrical biraphid
BASIONYM: Frustulia bahlsii Edlund and Brant 1997
Valves area lanceolate to weakly rhombic, with rounded apices. Longitudinal ribs are straight, except at the central nodule, where they are constricted. The distal end of the longitudinal ribs is spatulate and blunt. The raphe is straight and filiform. Both the proximal and distal raphe ends are T-shaped. Transverse striae are parallel, except at the apices where they are circumradiate. Longitudinal striae are wavy throughout.
Basionym: Frustulia bahlsii
Author: Edlund and Brant 1997
Length Range: 98-193 µm
Width Range: 24-33 µm
Striae in 10 µm: longitudinal striae 16-23, transverse striae 20-26
Cells solitary. Valves lanceolate to rhombic-lanceolate, valve face flat, apices rounded to slightly rostrate (Figs 1-6). Valve length 98-193 µm, valve breadth 24-33 µm. Central area not differentiated from narrow axil area on valve exterior (Figs 5, 7). Axial area terminates in a slightly expanded spatulate hyaline field (Figs 1-4, 9). Striae punctate; longitudinal striae parallel to slightly undulate, 16-23 in 10 µm and transverse striae parallel to slightly undulate, 20-26 in 10 µm (Figs 1-4, 11-14). Striae continuous around valve apices (Figs 9, 10). Areolae poroid, occluded internally by domed vela (Figs 7-10). Raphe straight and simple; its proximal and distal ends T-shaped on the valve exterior (Figs 7, 9). Raphe enclosed between two internally thickened siliceous ribs (Figs 6, 8, 10). Ribs parallel to slightly curved internally along axial area, slightly expanded around proximal raphe ends to form spatulate thickening rather than a “porte-crayon” usually present in the genus (Fig. 10).
Cite This Page:
Burge, D., Edlund, M., and Brant, L. (2015). Frustulia bahlsii. In Diatoms of the United States. Retrieved March 25, 2017, from http://westerndiatoms.colorado.edu/taxa/species/frustulia_bahlsii
Species: Frustulia bahlsii
Reviewer: Sarah Spaulding
Edlund, M.B. and Brant, L. (1997). Frustulia bahlsii sp. nov., a freshwater diatom from the Eastern U.S.A. Diatom Research 12 (2): 207-216.
Frustulia bahlsii has been reported from Maine, New Hampshire, New Jersey, and North Carolina (Edlund and Brant 1997). The type locality, Flat Laurel Gap Bog, Haywood County, North Carolina, is a sphagnum bog with low pH and low conductivity. We have also observed F. bahlsii in the Upper Peninsula of Michigan and southern Alaska.