Abstract
SummaryThe formation of mature thalli of Peltigera didactyla from soredia occured within an average time span of 5 to 6 months or even less in laboratory cultures. The size and growth forms of the thalli (musselshaped and branched type) were dependent upon the number of the soredia involved in the thallus forming process. Not only soredia amalgamated, but also lobe primordia can fuse during early development to form a joint thallus.The resynthesis of Peltigera praetextata from its isolated myco- and cyanobiont was achieved in laboratory controlled cultures. Fully developed thalli were only formed on soil substratum after an incubation time of at least 2 years. Culture experiments with Peltigera praetextata were also carried out by Yoshimura and Yamamoto (1990) by the tissue culture method. These results will be discussed.
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