• Category
  • Length Range
    20-36 µm
  • Width Range
    2.5-3.5 µm
  • Striae in 10 µm
    difficult to resolve in LM
  • Synonyms
    Nitzschia gandersheimiensis f. tenuirostris (Grunow in Van Heurck) Lange-Bert. 1980
    Nitzschia capitallata var. tenuirostris (Grunow in Van Heurck) Bukht. 1995



Valves with parallel or nearly parallel sides, tapering to a fine apex with subcapitate apices. Fibulae are variable in size and spacing, numbering 12-15 in 10 µm. Striae are not visible, or barely visible, with LM.


Original Description

  • Author
    Grunow in Van Heurck 1881

Citations & Links


Cite This Page

Kociolek, P. (2011). Nitzschia palea var. tenuirostris. In Diatoms of North America. Retrieved June 23, 2024, from https://diatoms.org/species/nitzschia_palea_var._tenuirostris


The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Nitzschia palea var. tenuirostris 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.