Bibliographic Detail
Tschermak-Woess, E., Hua, M., Gärtner, G. & Hesse, M., 2006
Reference:
Tschermak-Woess, E., Hua, M., Gärtner, G. & Hesse, M. (2006). Observations in Hemichloris antarctica Tschermak-Woess
& Friedmann (Chlorophyceae) and the occurrence of a second Hemichloris species, Hemichloris polyspora n. sp. Plant Systematics and Evolution 258: 27-37.
Notes:
Emer. Prof. E. Tschermak-Woess passed away on April 26th, 2001. She carried out scientific research in an undiminished manner up to her last year of life. She published during her lifetime 108 papers, the last one in Pl. Syst. Evol. 225, 214218 (2000). (An obituary with references to her publication record was published by M. Hesse in Verh. Zool. Bot. Ges. O sterreich 138: 275278, 2001). After the decease of Prof. E. T.-W. the present manuscript was found in a widely completed version, because E. T.-W. had devoted her mind and her forces to the subject of the rare cryptoendolithic Antarctic algae almost to her final days. The additional authors felt their duty to complete and to publish it as her 109th paper. They are deeply indebted to emer. Prof. Dr. E. I. Friedmann not only for extensive discussions with the late emer. Prof. Dr. E. Tschermak-Woess to prepare an earlier manu- script version but also encouraging during his Viennese stay in December 2002 to finish the manuscript. One of the authors (G.G.) reinvesti- gated the strains of Hemichloris polyspora which were deposited in the Culture Collection of Algae at the Botanical Institute of the University at Innsbruck and remembered vividly the intense discussions with Prof. E. T.-W. based on her very careful examinations with the microscope, as it is documented here in her last paper.
Abstract:
Abstract. The chlorococcalean genus Hemichloris is characterized by the possession of two chloroplasts per vegetative cell. The occurrence of a second species of the genus is reported (H. polyspora sp. nov.). Just as H. antarctica it grows cryptoen- dolithically in sandstone in Southern Victoria Land, Antarctica. In H. antarctica propagation by two autospores prevails over four, whilst in the new species H. polyspora in general four or eight (rarely 16 or 32) autospores are produced and Borodinella- stages do occur typically. Sexuality and zoosporu- lation do not exist in both species. Internal structures of chloroplasts can be observed by light microscopy more regularly in H. polyspora than in H. antarctica and under various conditions. Inves- tigations of both Hemichloris species by transmis- sion electron microscopy show them to go back to more or less extended assemblages of plastoglobuli. In both species the plastoglobuli are arranged around tubular inflations of thylakoids and appar- ently attached to the thylakoids. Keeping the cultures for three (even up to seven) months without light makes them survive and causes coming forth of the chloroplast structure throughout.
