Psammothidium nivale

Potapova and Enache 2013      Category: Monoraphid

Psammothidium levanderi


Psammothidium pennsylvanicum

LM scalebar = 10 µm = 80 pixels.


Contributor: Marina Potapova - March 2014
Length Range: 12-15 µm
Width Range: 5.6-6 µm
Striae in 10 µm: 26–28 on rapheless valve, 30–32 on raphe valve


Valves are elliptic. The raphe valve has a linear axial area and a transapically rectangular to oval central area, occupying 2/3 of the valve breadth. The raphe has proximal pores that are slightly expanded and located in grooves. The distal raphe has simple distal ends. The rapheless valve has an axial area that is narrow at the apices and widens toward the valve center, in a rhombic-lanceolate shape and occupies 2/3 of the valve breadth. Striae are slightly radiate, and more coarse on the rapheless valve as compared to the raphe valve. Areolae on the rapheless valve are visible in LM.

Original Description

Author: Potapova and Enache 2013
Length Range: 11.7-15 µm
Width Range: 5.6-6 µm
Striae in 10 µm: 26–28 in 10 μm on rapheless valve, 30–32 on raphe valve

Original Description

Original Images

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

Species: Psammothidium nivale

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.