TY - JOUR N2 - The paper describes anatomical and physiological features of photobionts and mycobionts in Bryoria forsteri Olech & Bystrek, Caloplaca regalis (Vain.) Zahlbr., Cetraria aculeata (Schreb.) Fr., Ramalina terebrata Hook f. & Taylor, Sphaerophorus globosus (Huds.) Vain. and Usnea antarctica Du Rietz, collected in the Antarctic under varied weather conditions. Green algae from the genera Lobosphaera and Trebouxia were gathered in depressions of the cortex under the more resistant mycobiont hyphae. In photobiont cells a large amount of highly osmiophilic electron-dense PAS-negative material, lipid-like in character, was of particular interest. Similar material also filled certain areas of the aerial apoplast. A star-shaped chromatophore with central and lateral pyrenoids encompassed most of the photobiont protoplast in all the studied species. Regularly arranged thylakoids with evenly widened lumina along their entire length and osmiophilic lipid droplets adhering to their outer surfaces were visible within the pyrenoid. Inside the chloroplast, large protein inclusions tightly joined with the thylakoids were observed. The mycobionts were closely attached to each other another and with the photobionts by means of an outer osmiophilic wall layer, and formed intramural haustoria. Their protoplasts were filled with PAS-positive polysaccharides and a large amount of lipid-like substances. The photobionts were physiologically active and produced a large amount of electron-dense osmiophilic material, and PAS-positive starch grains were visible around their pyrenoids in the thalli collected in different weather conditions. The permanent reserves of nutritive materials deposited in the thalli enable these organisms to quickly begin and continue indispensable physiological processes in the extreme Antarctic conditions. L1 - http://journals.pan.pl/Content/81752/PDF/05_gielwanowska.pdf L2 - http://journals.pan.pl/Content/81752 PY - 2012 IS - No 1 DO - 10.2478/v10182-012-0004-0 KW - Antarctic lichens KW - Bryoria forsteri KW - Caloplaca regalis KW - Cetraria aculeata KW - Ramalina terebrata KW - Sphaerophorus globosus KW - Usnea antarctica KW - morphology KW - ultrastructure A1 - Olech, Maria A1 - Giełwanowska, Irena PB - Biological Commission of the Polish Academy of Sciences – Cracow Branch VL - vol. 54 DA - 2012 T1 - New Ultrastructural and Physiological Features of the Thallus in Antarctic Lichens UR - http://journals.pan.pl/dlibra/publication/edition/81752 T2 - Acta Biologica Cracoviensia s. Botanica ER -