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= Batrachospermum Macrosporum = Batrachospermum Macrosporum is a freshwater species of red algae.

Heterotypic Synonyms

 * Batrachospermum excelsum Montagne 1850
 * Batrachospermum macrosporum Montagne 1850
 * Batrachospermum oxycladum Montagne 1850
 * Chantransia macrospora H.C.Wood 1873
 * Batrachospermum macrosporum var. excelsum (Montagne) Sirodot 1884
 * Batrachospermum macrosporum var. oxycladum (Montagne) Sirodot 1884
 * Batrachospermum australe Collins 1906
 * Batrachospermum macrospora (Wood) Collins 1906
 * Pseudochantransia macrospora (H.D.Wood) F.Brand 1910
 * Audouinella macrospora (Wood) Sheath & Burkholder 1985

Morphology
"Plants macroscopic, up to 30 mm high, and composed of > 50 cells, bluish; basal part consisting of well-developed rhizoids; lateral branches developing at angles < 25°; vegetative cells of main branches cylindrical, 33.5- 108.5 x 10.5-36.0/μm; monosporangia spherical to obovoidal, single or in pairs, 18.5-38.0 x 15.5-28.5/μm. Gametangia, tetrasporangia and carposporophytes not observed."Colour is blue-green but is known to vary depending on irradiance, temperature and photoperiod.

The shape of monosporangia are spherical, subspherical or obovoid.

The shape of vegetative cells are exclusively cylindrical.

Life Cycle
"The life history pattern of the Batrachospermales is designated as the ' Lemanea ' type and involves only one spore type, the carpospore (Dixon 1982; Sheath 1984). Tetraspores are not formed by the ' Chantransia ' stage, which instead produces the juvenile gametophytes on the apical cells (Sheath 1984). Such division occurs in the diploid vegatative cells of the 'Chantransia ' and gives rise to haploid axis by a process known as somatic meiosis, which is unique to the Batrachspermales sensu lato in the red algae (Magne 1967; Balakrishnan & Chaugule 1975, 1980; Pueschel & Cole 1982).""Type IV (The Lemanea mamillosa Type). The germlings of carpospores give rise to pseudochantransia plants. Apical cells of the plant undergo meiosis, which is a reduction division of vegetative cell, and then differentiate into a haploid upright plant directly. This plant develops into a gametophyte with carpogonia and spermatangia. The life history is diphasic and composed of a haploid gametophyte and a diploid carposporophyte, lacking a tetrasporophyte."

Reproduction
With low irradiance (65 PAR) at 25°, the 'Chantransia ' will fail to produce monosporangia.

Gametophytes were observed at optimal culture conditions (temperature 20 °C, photoperiod 12:12 h and irradiance 140-160 μmol photons m–2 s–1).