Parechymorpha

Generic name: PARENCHYMORPHA Tseng et Hua 1984. Sci. Sin., ser. B. 27(8): 813.

Synonyms:

Diagnosis:

Type species: Parenchymorpha xishanica Tseng et Hua 1984

Descriptions:
Komárek (1992): Filamentous-thallous; thallus attached, heterotrichous with filaments originally creeping on the substrate, without or with very fine, colourless, unstructured and diffluent sheath (visible usually only in the upper parts of filaments). Trichomes uniseriate, flexuous, clearly constricted at cross-walls, commonly true pseudodichotomously branched, (T-, V- and indistinct reverse Y-type),towards the apices continually attenuated into the long, cellular, cylindrical, thin, hair-like ends. In the centre of old colonies arise from coalesced filaments pseudoparenchymatous flat, cellular discs with one layer of cells, adhering firmly to the substrate, from which radially arise repeatedly branched filaments, oriented_more or less parallely, free upon the substrate. Cells more or less barrel-shaped up to irregular. Heterocytes missing. Akinetes arise in short disintegrating rows, spherical or subspherical, larger than vegetative cells.

Genotype differences, molecular data:

Reproduction strategies, life cycles, cell division:
Komárek (1992): Cells divide crosswise , or lengthwise (irregularly) before branching and in pseudoparenchymatous discs. Reproduction by hormogonia and liberating akinetes. Hormogonia separate from trichomes by help of necridic cells.

Ultrastructure:

Taxonomic position, higher hierarchy:
Cyanophyceae, Nostocales, Symphyonemataceae
Notes to taxonomy, misinterpretations:

Ecology, ecophysiology, ecological significance:
Komárek (1992): Marine; creeping on the gelatinous membranous outgrowth of Strombus-shell. Known only from the littoral of Xisha Islands, South China Sea.

Physiology and biochemistry:

Distribution, endemism, problematic citations:

Reference strain:

Infrageneric scheme, species concept:

List of species:

Parenchymorpha xishanica Tseng et Hua 1984

Keys:

List of stains:

Drawings:

Komárek 1992

Application technology:

Literature:

	2.1 taxonomy: Tseng & Hua 1984, Tseng & Hua 1985, Komárek 1992
	2.2 cytomorphology:
	2.3 16S rRNA sequencing:
	2.4 biology and life cycles:
	2.5 ecology:

Back to list of valid genera

Navigation