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Sacconema

Generic name: SACCONEMA Borzi ex Bornet et Flahault, 1886. Ann. Sci. Nat. Bot., ser. 7, 3: 381.
Synonyms:
Diagnosis:
Bornet & Flahault (1886): Trichomata irregulariter caespitoso-aggregata, 2 — plura vagína commuii fuscescente, lamelloso stratificata, valde ampliato-saccata, demum apice soluta, involuta et thallum exiguum gelatinosum laciniato-lobulatum constituentia; pseudoramulis brevibus, moniliformibus, discretis, heterocysta basilari, globosa instructis; sporis aureo-fuscis, articulos vegetativos duplo superantibus; exosporio crassiusculo scabro.
Type species: Sacconema rupestre Borzi ex Bornet et Flahault 1886. - Several species, which can be developmental stages of other species (Dichothrix, Petalonema); revision necessary.
Descriptions:
Komárek (1992): Filamentous - colonial; filaments heteropolar, irregularly falsely branched, attached by the bases to the substrate or creeping among detritus and other algae, forming shrub-like colonies, composed from heteropolar trichomes and intensely swollen sheaths. Trichomes solitary or in pairs in one sheath, uniseriate, heteropolar, constricted at cross-walls, with basal heterocytes, in the apical part narrowed in elongated, cellular hair; hair-cells cylindrical, hyaline. Sheaths very thick, swollen, widened, up to 10-times wider than trichomes, firstly closed, later open at the apex, intensely lamellated, at the apex funnel-like divaricated, partly yellowish-brown or brown. Heterocytes basal or intercalar (before the false branching) and secondary at bases of branches, spherical or hemispherical. Akinetes described at trichome bases, more or less spherical, but not well known.
Genotype differences, molecular data:
Reproduction strategies, life cycles, cell division:
Komárek (1992): Cells divide perpendicularly to the lengthwise trichome axis (meristematic zones ?). Reproduction probably by hormogonia.
Ultrastructure:
Taxonomic position, higher hierarchy: Cyanophyceae, Nostocales, Rivulariaceae
Notes to taxonomy, misinterpretations:
Ecology, ecophysiology, ecological significance:
Komárek (1992): All unsufficiently described species from communities of subaerophytic localities, wet rocky walls and stony littoral of lakes.
Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:
Sacconema rupestre Borzi ex Bornet et Flahault, 1886. Ann. Sci. Nat. Bot., ser. 7, 3: 381
Keys:
List of stains:
Drawings:
Application technology:
Literature:

  2.1 taxonomy: Bornet & Flahault 1886, Geitler 1932, Geitler 1942, Poljanskij 1935, Skuja 1937, Komárek 1992
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: