Psammothidium alpinum

Potapova and Enache 2013      Category: Monoraphid

Psammothidium acidoclinatum


Psammothidium bioretii

LM scalebar = 10 µm = 80 pixels.


Contributor: Marina Potapova - December 2014
Length Range: 15-30 µm
Width Range: 6.3-9.1 µm
Striae in 10 µm: 22-25


Valves are linear-elliptic to oval. Raphe valve has a narrow linear axial area and rectangular-irregular central area. Raphe is straight with hook-like proximal ends, drop-shaped distal ends. Rapheless valve has a narrow axial area and an irregular, rounded to rhomboid central area, occupying about ½ of valve breadth. Striae are slightly radiate, 22–25 in 10 μm; shortened marginal striae are present. Areolae are coarse, round, 25 in 10 μm.

Original Description

Author: Potapova and Enache 2013
Length Range: 14.6-30 µm
Width Range: 6.3-9.1 µm
Striae in 10 µm: 22-25

Original Description

Original Images

Cite This Page:
Potapova, M. (2014). Psammothidium alpinum. In Diatoms of the United States. Retrieved April 21, 2018, from

Species: Psammothidium alpinum

Contributor: Marina Potapova

Reviewer: Sarah Spaulding


Enache, M.D., Potapova, M. Sheibley, R. and Moran, P. (2013). Three new Psammothidium species from lakes of Olympic and Cascade Mountains in Washington State, USA. Phytotaxa 127: 49-57. 10.11646/phytotaxa.127.1.8

Sheibley, R.W., Enache, M., Swarzenski, P.W., Moran, P.W. and Foreman, J.R. (2014). Nitrogen deposition effects on diatom communities in lakes from three national parks in Washington state. Water, Air, and Soil Pollution 225: 1857. 10.1007/s11270-013-1857-x

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)


Autecology Discussion

So far found only in oligotrophic lakes of Washington Cascade Mountains.