• Category
  • Length Range
    45-68 µm
  • Width Range
    10.0-12.2 µm
  • Striae in 10 µm
  • Reported As
    Navicula viridula var. linearis Hustedt (Patrick and Reimer 1966)



Valves linear with wedge-shaped apices. The axial area is narrow and straight. The central area is asymmetric, trapezoid on primary side, semi-circular on secondary side. The raphe is straight, with external proximal raphe ends slightly dilated and bent towards primary side of the valve. The central nodule is asymmetrically expanded on the internal valve surface to the primary side. Striae are radiate in the valve center, becoming convergent at the apices. The areolae are visible under LM, 22-26 in 10 μm.


Original Description

Valves usually somewhat broader and more abruptly cuneate towards the ends (than the nominate variety)

  • Author
    Lange-Bert. and Rumrich in Rumrich, Lange-Bert. and Rumrich 2000

Original Images

Naviridulacal Neomund
Naviridulacal  Or Desc Full

EMAP Assessment

EMAP Distribution

Navicula Viridulacalcis 40 Copy
Map 40

Response Plots

Navicula Viridulacalcis Copy

Cite This Page

Potapova, M. (2011). Navicula viridulacalcis subsp. neomundana. In Diatoms of North America. Retrieved June 21, 2018, from https://diatoms.org/species/navicula_viridulacalcis


The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Navicula viridulacalcis subsp. neomundana 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.