Gb. Feige et Ht. Lumbsch, THE ASCOMA DEVELOPMENT IN ARCTOPELTIS-THULEANA (LECANORACEAE) AND ITSSYSTEMATIC SIGNIFICANCE, Cryptogamie. Bryologie, lichenologie, 19(2-3), 1998, pp. 147-153
The structure and development of the apothecia in Arctopeltis thuleana
were studied. A cupulate hypothecium is present. The ontogeny follows
the pattern described from some placodioid Lecanora species (e.g., L.
opiniconensis) and the genus Rhizoplaca. The significance of ontogene
tic characters in the distinction of the Lecanoraceae and Parmeliaceae
is discussed. The presence of a cupula is regarded as a weak distingu
ishing character in the Lecanoraceae.