In colour the apothecia are extremely variable, and it is but rarely that they are the same colour as the thallus (e.g.
Lecideine apothecia, which are not black, but otherwise variously coloured, are termed biatorine.
The apothecia, though of the normal fungal type and usually disk-shaped, are somewhat more variable, and since the Morphologie and Biologie der Pilze, Mycetozoen und 1 The thalline margin (margo thallinus) is the projecting edge of a special layer of thallus, the amphithecium, round the actual apothecium; the proper margin (margo proprius) is the projecting edge of the apothecium itself.
The spores are ejected from the apothecia and peri thecia as in the fungi by forcible ejacu lation from the asci.
Most systems agree in deriving the major divisions from the characters of the reproductive organs (perithecia, apothecia, or basidiospore bearing fructification), while the characters of the algal cells and those of the thallus generally are used for the minor divisions.