Boreozonacola olympica

(Sovereign) Lange-Bert., Kulikovskiy and Witkowski 2010      Category: Symmetrical biraphid
BASIONYM: Navicula pseudosilicula var. olympica Sovereign 1963

Boreozonacola hustedtii


Brachysira arctoborealis

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - December 2011
Length Range: 20-47 µm
Width Range: 6.3-8.2 µm
Striae in 10 µm: 18-20


Valves are linear to biundulate, with parallel sides in smaller specimens to slightly concave sides in larger specimens. Apices are cuneate and rounded. The axial area is narrow, gradually widening toward the small elliptic central area. The raphe is weakly lateral. The proximal raphe ends curve toward the primary side of the valve. Distal raphe ends are hooked toward the secondary side. Striae are parallel in the middle, become weakly radiate, and then parallel again at the apices. Areolae are coarse and number 18-20 in 10 µm.

This taxon may be conspecific with Navicula natchikae, described from Kamchatka (Petersen 1946).

Original Description

Basionym: Navicula pseudosilicula var. olympica
Author: Sovereign 1963
Length Range: 21-47 µm
Width Range: 6-8 µm
Striae in 10 µm: 17-19

Original Description

Valves linear with cuneate rounded ends, margins slightly triundulate, 21-47 µ long, 6-8 µ wide. Axial area narrow lanceolate, central area irregular elliptical. Raphe threadlike, slightly curved, central pores distant. Striae radial infrequently becoming parallel at the ends, 17-19 in 10 µ, plainly punctate, the puncta spaced about 20 in 10 µ.

Original Images

Cite This Page:
Bahls, L. (2011). Boreozonacola olympica. In Diatoms of the United States. Retrieved April 20, 2018, from

Species: Boreozonacola olympica

Contributor: Loren Bahls

Reviewer: Sarah Spaulding


Hein, M. (1990). Flora of Adak Island, Alaska: Bacillariophyceae (Diatoms). Bibliotheca Diatomologica (H. Lange-Bertalot, ed.), Band 21, J. Cramer, Berlin, 133 pp.+ 53 plates.

Hustedt, F. (1942). Diatomeen aus der Umgebung von Abisko in Schwedisch-Lappland. Archiv für Hydrobiologie 39(1): 87-174 .

Kulikovskiy, M.S., Lange-Bertalot, H., Witkowski, A., Dorofeyuk, N.I. and Genkal, S.I. (2010). Diatom assemblages from Sphagnum bogs of the world. I. Nur bog in northern Mongolia. Bibliotheca Diatomologica 55: 1-326.

Petersen, J.B. (1946). Algae collected by Eric Hulten on the Swedish Kamtchatka Expedition 1920-1922, especially from Hot Springs. Det Kongelige Danske Videnskabernes Selskab, Biologiske Meddelelser 20 (1): 1-122.

Sovereign, H.E. (1963). New and rare diatoms from Oregon and Washington. Proceedings of the California Academy of Sciences, series 4, 31(14): 349-368.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Boreozonacola olympica CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion

There are 17 records of Boreozonacola olympica in the Montana Diatom Collection, all from streams, lakes, ponds, and fens in northern Idaho and western Montana. The pH of these waters ranges from 6.0 to 7.8 and specific conductance ranges from 16 to 71 µS/cm. This taxon was described from springs in Olympic National Park, Washington (Sovereign 1963) (elevation 1676 meters, pH 6.8). It has also been repored from Adak Island, Alaska (Hein 1990) .


No Name Lake, Glacier National Park, Montana: home of Boreozonacola olympica.

Credit/Source: Loren Bahls