Borzia

Generic name: BORZIA Cohn ex Gomont, 1892. Ann. Sci. Nat. Bot., ser. 7, 16: 198.

Synonyms:
Borzia Cohn....; pre-starting-point syn.

Diagnosis:

Gomont (1892): Trichomata evaginata, libera, ambitu oblonga, paucirticulata.

Type species: Borzia trilocularis Cohn ex Gomont 1892.

Descriptions:
Komárek (1992):Filamentous; solitary filaments or small groups of trichomes. Trichomes with a limited growth, usually short (with up to 16 cells/trichome), 0.5-7 μm wide, uniserial, unbranched, more or less straight or slightly curved, isopolar, not attenuated to the ends, mainly constricted, rarely unconstricted at the cross walls. Sheaths lacking, sometimes (facultatively) with fine mucilage enveloping trichomes. Immotile, rarely with indistinct trembling of trichomes. All cells morphologically and functionally identical, isodiametric or slightly shorter or longer than wide, cylindrical up to barrel-shaped, end cells widely rounded; thylakoids probably concentrically
arranged along the cell walls. Heterocytes and akinetes missing.
Smith (1950:575): Trichomes of Borzia are without a gelatinous sheath and are usually composed of 3 to 8 cells. Terminal cells of a trichome are hemispherical, and other cells are barrel-shaped This genus may be looked upon as one that is in a permanent hormogonial condition.

Genotype differences, molecular data:

Reproduction strategies, life cycles, cell division:
Komárek (1992): Reproduction by the cross-wise cell division, all cells capable to divide. Trichomes divide between vegetative cells without necridia, after they reach a distinct length (usually only with several cells). Trichome fragments immotile (hormocytes), isopolar, germinate at both ends.

Ultrastructure:

Taxonomic position, higher hierarchy: Cyanophyceae, Oscillatoriales, Borziaceae
Notes to taxonomy, misinterpretations:

Ecology, ecophysiology, ecological significance:
Komárek (1992): The different species occur in periphyton and metaphyton of clear, mainly small freshwater water bodies with water plants (three species), epiphytically (endogloeic) in the mucilage of other freshwater algae (1), benthic in lakes (1) or aerophytic on calcareous substrates (2). Known mainly from the Europe, the type species B. trilocularis has probably cosmopolitan distribution (but it is not common).

Physiology and biochemistry:

Distribution, endemism, problematic citations:

Reference strain:

Infrageneric scheme, species concept:

List of species:

Borzia austriaca(Claus) Anagnostidis et Komárek 1988
Borzia brevis (Kufferath) Anagnostidis 2001
Borzia curta (Lemmermann) Anagnostidis et Komárek 1988
Borzia indica Chatterjee et Keshri 2005
Borzia periklei Anagnostidis in Anagnostidis et Komárek 1988
Borzia susedana Ercegović 1925
Borzia trilocularis Cohn ex Gomont 1892

Unclear taxa:
Borzia elongata Baker et al. 1997
Borzia spongeliae(Schulze) Feldmann 1958
Borzia sp. sensu Reisigl 1964
Borzia sp. 1 and 2 sensu Silva & Pienaar 2000

Keys:

List of stains:

Drawings:

Komárek
(1992):

Application
technology:

Literature:

	2.1 taxonomy: Gomont 1892, Smith 1950, Anagnostidis et Komárek 1987, Komárek 1992, Komárek & Anagnostidis 2005
	2.2 cytomorphology:
	2.3 16S rRNA sequencing:
	2.4 biology and life cycles:
	2.5 ecology:

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