Gomphonema johnsonii

Bahls 2013      Category: Asymmetrical biraphid
BASIONYM: Gomphonema johnsonii Bahls 2013

Gomphonema elongatum

 

Gomphonema kobayasii

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Loren Bahls - April 2013
Length Range: 24-50 µm
Width Range: 6.9-8.5 µm
Striae in 10 µm: 9-12 at the valve center, 14-18 near the apices

Description

Valves are lanceolate with narrow subapiculate apices and slightly asymmetric to the apical axis. A pore field is present at the footpole. The axial area is narrow and linear, widening to merge with a moderately large elliptic central area. The raphe is straight and weakly lateral, becoming filiform at the proximal and distal ends. Proximal raphe ends are weakly expanded. Distal raphe fissures are hooked to the side opposite the central stigma. Striae are radiate, more strongly so at the footpole but nearly parallel at the headpole. A single stigma lies at the end of the longest central stria. Striae at the center are more widely spaced than striae near the poles. Areolae are fine and number 30-35 in 10 µm.



Original Description

Basionym: Gomphonema johnsonii
Author: Bahls 2013
Length Range: 24-50 µm
Width Range: 6.9-8.5 µm
Striae in 10 µm: 9-12 at valve center, 14-18 near the apices

Original Description

Valves lanceolate with narrow subrostrate apices. Valve length 24–50 μm; valve width 6.9–8.5 μm. Pore field present at the footpole. Valves somewhat asymmetric about the apical axis. Axial area narrow and linear, widening to merge with a moderately large elliptic central area. Raphe straight and weakly lateral, becoming filiform at the proximal and distal ends. Proximal raphe ends weakly expanded; terminal raphe fissures hooked to the side opposite the central stigma. Striae strongly radiate, 9–12 in 10 μm at the valve center, 14–18 in 10 μm near the apices. Areolae 30–35 in 10 μm. One stigma present at the end of the longest central stria.

Original Images


Cite This Page:
Bahls, L. (2013). Gomphonema johnsonii. In Diatoms of the United States. Retrieved April 20, 2014, from http://westerndiatoms.colorado.edu/taxa/species/gomphonema_johnsonii

Species: Gomphonema johnsonii

Contributor: Loren Bahls

Reviewer: Marina Potapova

Citations

Bahls, L. (2013). New diatoms (Bacillariophyta) from western North America. Phytotaxa 82(1): 7-28.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Gomphonema johnsonii is known only from the type locality, a spring on the Willamette National Forest in Oregon.