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Cronbergia

Generic name: CRONBERGIA Komárek, Zapomělová et Hindák, 2010. Cryptogamie, Algologie 31(3): 329
Synonyms:
Diagnosis:
Komárek et al. (2010):
Fila cyanoprocaryotica, isopolaria, uniseriata, simplicia, solilaria vel in aggregationibus liberis plus minusve irregulariter disposita, sine vaginis conspicuis, curta, recta, arcuata vel paulo flexuosa. Trichomata paucicellularia (ad 35-cellularia), usque ad 120 um longa, cylindrica, cum helerocylis sporisque, ad dissepimenta constricta. Cellulae vegetativae sphaericae, doliiformes, ovales ad cylindricae. Heterocytae binatim in parte centrali trichomatis, per divisionem symmetricam unae cellulae vegetativae oriundae; trichomata postea inter heterocytis intercalaribus separantur; heterocytae sphaerieae vel ovales, in trichomatibus adultis in positione terminali. Akineta solitaria vel in seriebus, ovalia vel cylindrica, apo- vel paraheterocytice evolventia.

Etymology: The genus is named to the honour of Swedish phycologist Gertrud Cronberg.
Type species: Cronbergia siamensis (Antarikanonda) Komárek, Zapomělová et Hindák 2010
Descriptions:
Komárek et al. (2010): Nostocacean cyanoprokaryotic (cyanobacterial) taxonomic unit with isopolar, uniserial, unbranched filaments with heterocytes and akinetes. Trichomes solitary, without sheaths, free-tloating, or in fine, mucilaginous thallus, more or less straight or slightly flexuous, short (up to 80-120 um long), with terminal heterocytes on both isopolar ends, cylindrical, distinctly constricted at the cross-walls. Cells more or less spherical, barrel-shaped or slightly elongate or oval. Heterocytes terminal, spherical, ovoid or slightly oval, but developing intercalarly from one vegetative cell, which elongates, later symmetrically divides and from each daughter cell a heterocyte develops. Thus, the proheterocytes are originally situated in pairs in the intercalary position, but the trichomes quickly break at the junction between the young intercalary heterocytes. Akinetes arise next to the polar heterocytes, slightly distant from them by 1-2 vegetative cells, solitary or in short rows, or in the centre of short trichomes in chains; they are oval or oval-cylindrical.

Genotype differences, molecular
data:

Komárek et al. (2010)
Cronbergia tree Komárek et al 2010

Reproduction strategies, life
cycles, cell division:
Komárek et al. (2010):
Cronbergia reproduction Komárek et al. 2010   Cronbergia reproduction Komárek et al. 2010
Ultrastructure:
Taxonomic position, higher hierarchy:
Nostocophycideae, Nostocales, Nostocaceae
Ecology, ecophysiology, ecological significance:
Physiology and biochemistry:
Antarikanonda (1980): nitrogen fixing type
Distribution, endemism, problematic citations:
Reference strain:
Komárek et al. (2010): The strain SAG B11.82 (= CCALA 756) deposited as dry material (exsiccate), preserved in a metabolic active state (ICBN Art. 8.4) in BRNM (no HY2333); typical and reference strain: Antarikanonda 1976 (= SAG B11.82 = CCALA 756) is deposited also in a lyophylised state (under the designation "CCALA 756") in the Phycological Department. Institute of Botany ASCR, Třeboň, Czech Republic.
Infrageneric scheme, species concept:

List of species:
Cronbergia paucicellularis Komárek, Zapomělová et Hindák 2010. Cryptogamie, Algologie 31(3): 332
Cronbergia planktonica (Cronberg) Komárek, Zapomělová et Hindák 2010. Cryptogamie, Algologie 31(3): 333
Cronbergia siamensis (Antarikanonda) Komárek, Zapomělová et Hindák 2010. Cryptogamie, Algologie 31(3): 329

Unclear taxa:
Cronbergia  sp. in Komárek, Zapomělová et Hindák 2010. Cryptogamie, Algologie 31(3): 333

Keys:
Komárek et al. (2010):
Cronbergia key Komárek et al 2010
List of stains:
Drawings:
Application technology:
Literature:

  2.1 taxonomy: Komárek et al. 2010
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: