Geissleria ignota

(Krasske) Lange-Bertalot and Metzeltin 1996      Category: Symmetrical biraphid
BASIONYM: Navicula ignota Krasske 1932

Geissleria decussis

 

Geissleria kriegeri

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Rex Lowe - December 2011
Length Range: 16-18 µm
Width Range: 3.0-3.2 µm
Striae in 10 µm: 15-16

Description

Valves are triundulate with rostrate to subcapitate ends. The central area is expanded laterally with 2-4 shortened striae at the valve margin. The striae are radiate near the center of the valve becoming parallel near the ends. Two to three rows of annulae are at each apex of the valve.



Original Description

Basionym: Navicula ignota
Author: Krasske 1932
Length Range: 17-25 µm
Width Range: 4.5-5 µm
Striae in 10 µm: 12-14

Original Description

Linear, dreiwellig, Enden gerundet. Lang 17-25µ, breit 4,5-5µ. 12-14 Streifen in 10 µ, gebogen, die konvexe Seite den Enden zugewandt, die mittelsten stark verkürzt, so daB sich die schmale, lineare Längsarea in der Mitte fast bis zum Rande erweitert. Die mittleren Streifen konvergierend , gegen die Enden senkrecht zur Raphe.

Original Images


Cite This Page:
Lowe, R. (2011). Geissleria ignota. In Diatoms of the United States. Retrieved October 20, 2014, from http://westerndiatoms.colorado.edu/taxa/species/geisleria_ignota

Species: Geissleria ignota

Contributor: Rex Lowe

Reviewer: Sarah Spaulding

Citations

Krasske, G. (1932). Beiträge zur Kenntnis der Diatomeenflora der Alpen. Nova Hedwigia 72(3): 92-135.

Lange-Bertalot, H. and Metzeltin, D. (1996). Indicators of oligotrophy - 800 taxa representative of three ecologically distinct lake types, Carbonate buffered - Oligodystrophic - Weakly buffered soft water. Lange-Bertalot, H. (ed.), Iconographia Diatomologica. Annotated Diatom Micrographs. Vol. 2. Ecology, Diversity, Taxonomy. Koeltz Scientific Books. Königstein, Germany, 2:390 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Geissleria ignota CAS

North American Diatom Ecological Database (NADED)

NADED ID: 210005

Autecology Discussion