• Category
  • Length Range
    15-42 µm
  • Width Range
    3 µm
  • Striae in 10 µm



Valves are linear-lanceolate, with subrostrate to obtuse-capitate apices. The keel is constricted in the middle of the valve, with fibulae numbering 9-12 in 10 µm. There are two enlarged fibulae in the central valve. Striae are finely punctate.

This species has been reported only from Oregon.


Original Description

  • Author
    Sovereign 1958
  • Length Range
    15-42 µm
  • Width
    3 µm
  • Striae in 10µm

Original Images

Sovereign 1958  Plate  Iv Oregona
Sovereign 1958 P 130 Oregona

Cite This Page

Kociolek, P. (2011). Nitzschia oregona. In Diatoms of North America. Retrieved May 29, 2024, from https://diatoms.org/species/nitzschia_oregona


The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Nitzschia oregona from all the stream reaches where it was present. Note that the relative abundance scale is the same on each plot. Explanation of each environmental variable and units are as follows:

ELEVATION = stream reach elevation (meters)
STRAHLER = distribution plot of the Strahler Stream Order
SLOPE = stream reach gradient (degrees)
W1_HALL = an index that is a measure of streamside (riparian) human activity that ranges from 0 - 10, with a value of 0 indicating of minimal disturbance to a value of 10 indicating severe disturbance.
PHSTVL = pH measured in a sealed syringe sample (pH units)
log_COND = log concentration of specific conductivity (µS/cm)
log_PTL = log concentration of total phosphorus (µg/L)
log_NO3 = log concentration of nitrate (µeq/L)
log_DOC = log concentration of dissolved organic carbon (mg/L)
log_SIO2 = log concentration of silicon (mg/L)
log_NA = log concentration of sodium (µeq/L)
log_HCO3 = log concentration of the bicarbonate ion (µeq/L)
EMBED = percent of the stream substrate that is embedded by sand and fine sediment
log_TURBIDITY = log of turbidity, a measure of cloudiness of water, in nephelometric turbidity units (NTU).
DISTOT = an index of total human disturbance in the watershed that ranges from 1 - 100, with a value of 0 indicating of minimal disturbance to a value of 100 indicating severe disturbance.