Open Access Open Access  Restricted Access Subscription Access

Three new Psammothidium species from lakes of Olympic and Cascade Mountains in Washington State, USA



Populations of several Psammothidium species were found in core sediments from nine remote, high elevation, ultraoligotrophic and oligotrophic, Olympic and Cascade Mountain lakes. Three of these species, P. lacustre, P. alpinum, and P. nivale, are described here as new. The morphology of the silica frustules of these species was documented using light and scanning electron microscopy. We discuss the similarities and differences with previously described Psammothidium species.


diatom, lake sediments, alpine lakes, LM, SEM


Anonymous (1975) Proposals for a standardization of diatom terminology and diagnoses. Nova Hedwigia, Beih. 53: 323–354.

Aboal, M., Alvarez-Cobelas, M., Cambra, J. & Ector, L. (2003) Floristic list of non marine diatoms (Bacillariophyceae) of Iberian Peninsula, Balearic Islands, and Canary Islands. Updated taxonomy and bibliography. In: A. Witkowski (ed.), Diatom Monographs. A.R.G. Gantner Verlag K.G., 4: 639 pp.

Bukhtiyarova, L. & Round, F.E. (1996) Revision of the genus Achnanthes sensu lato section Marginulatae Bukht. Sect. nov. of Achnanthidium Kütz. Diatom Research 11:1–30.

Carter, J.R. (1963) Some new diatoms from British waters. Journal of the Quekett Microscopical Club 29(8): 199–203.

Cleve, P.T. & Grunow, A. (1880) Beiträge zur Kenntnis der arktischen Diatomeen. Kungliga Svenska Vetenskapsakademiens Handlingar 17(2): 1–121.

Flower, R.J. & Jones, V.J. (1989) Taxonomic descriptions and occurrences of new Achnanthes taxa in acid lakes in UK. Diatom Research 4(2): 227–239.

Germain, H. (1957) Achnanthes bioreti n.sp., diatomée nouvelle. Bulletin de la Société Botanique de France 104 (suppl.): 85–86.

Hohn, M.H. & Hellerman, J. (1963) Taxonomy and structure of diatom populations from three eastern North American rivers. Transactions of the American Microscopical Society 82: 250–329.

Hustedt, F. (1933) Die Diatomeenflora von Poggenpohls Moor bei Dötlingen in Oldenburg. Abhandlungen und Vorträge der Bremen Wissenschaftliche Gesellschaft 8/9: 362–403.

Lange-Bertalot, H. (1999) Neue Kombinationen von Taxa aus Achnanthes Bory (sensu lato). Iconographia Diatomologica 6: 276–289.

Round, F.E., Crawford, R.M. & Mann, D.G. (1990) The Diatoms. Biology and morphology of the genera. Cambridge University Press, Cambridge, 747 pp.

Schmidt, A. (1936) Atlas der Diatomaceen-kunde. Leipzig. O.R. Reisland Series VIII (Heft 101–102): pls. 401–408.

U.S. Geological Survey (2006) Collection of water samples (ver. 2.0): U.S. Geological Survey Techniques of Water-Resources Investigations. Book 9, chap. A4. September. Available from: (Accessed 15 January 2010)

Wilde, F.D., Radtke, D.B., Gibs, J. & Iwatsubo, R.T. (eds.) (2004) Processing of water samples (version 2.1): U.S. Geological Survey Techniques of Water-Resources Investigations. Book 9, chap. A5. April. Available from: (accessed 15 January 2010).


  • There are currently no refbacks.

ISSN 1179-3155 (print); ISSN 1179-3163 (online)

Published by Magnolia Press, Auckland, New Zealand