• Category
  • Length Range
    20-30 µm
  • Width Range
    2.5-3.0 µm
  • Striae in 10 µm
    Striae not visible with LM
  • Synonyms
    Synedra radians var. debilis (Kütz.) Rabenh. 1864



Valves are lanceolate, with more or less parallel sides. The valve margins gradually taper to the apices. Apices are rounded. Striae are not visible with LM. Fibulae number 12-15 in 10 µm.


Original Description

  • Basionym
    Synedra debilis
  • Author
    Kütz. 1844

Cite This Page

Kociolek, P. (2011). Nitzschia palea var. debilis. In Diatoms of North America. Retrieved July 19, 2024, from https://diatoms.org/species/nitzschia_palea_var._debilis


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