• Category
  • Length Range
    41-58 µm
  • Width Range
    8.3-9.8 µm
  • Striae in 10 µm



Valves are lanceolate with gradually attenuated, subtly protracted, and broadly rounded rostrate apices. The axial area is narrow and widens slightly near the central area. The central area is a rectangular stauros. Short striae are sometimes present at the margins. The raphe is lateral with straight proximal ends. Striae are slightly radiate in the middle, becoming more radiate toward the apices. Areolae are irregularly spaced, difficult to resolve in LM and number 24-30 in 10 µm.


Stauroneis bryocola is known from four lakes and ponds in southwestern Montana. The pH of these waters ranges from 6.5 to 7.8 and specific conductance ranges from 21 to 41 µS/cm. The type locality for Stauroneis bryocola is Heard Island in the sub-Antarctic Region, where it was found among wet mosses in some small tarns (Van de Vijver et al. 2004).

Bloody  Dick  Pond 2 1
Credit: Loren Bahls
Bloody Dick Pond No. 2, Beaverhead County, Montana: home of Stauroneis bryocola.

Original Description

Valves lanceolate to rhomboidal-lanceolate with protracted, rostrate-subcapitate ends. Pseudosepta absent. Length 40-57 µm, breadth 7-8.5 µm. Axial area narrow to moderately broad, linear, only slightly rhombically expanded near the central area. Central area forming an almost rectangular fascia, not expanded towards the valve margins. Raphe fissures lateral. Central endings straight, never curved to the very small, indistinct central pores. Striae slightly to moderately radiate in the middle, more radiate near the valve ends, 24-27 in 10 µm. Puncta of the striae irregularly spaced, 25-30 in 10 µm.

  • Author
    Van de Vijver and Lange-Bert. 2004
  • Length Range
    40-57 µm
  • Width
    7-8.5 µm
  • Striae in 10µm

Original Images

Sbryocola Origimag1
Sbryocola Origimag2
Sbryocola Origdesc

Cite This Page

Bahls, L. (2011). Stauroneis bryocola. In Diatoms of North America. Retrieved May 20, 2024, from https://diatoms.org/species/stauroneis_bryocola


The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Stauroneis bryocola 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.