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Studies in taxonomy and developmental morphology in Chiodecton, Dichosporidium, Erythrodecton and the new genus Pulvinodecton (Arthoniales, lichenized Ascomycetes)
Author(s) -
Henssen Aino,
Thor Göran
Publication year - 1998
Publication title -
nordic journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.333
H-Index - 33
eISSN - 1756-1051
pISSN - 0107-055X
DOI - 10.1111/j.1756-1051.1998.tb01105.x
Subject(s) - ascocarp , biology , taxonomy (biology) , botany , pycnidium , lichen , genus , zoology , mycelium
Lichen material of three genera in Arthoniales from the Seychelles and Madagascar is revised. The new species Chiodecton papillosum is described from Madagascar, Dichosporidium brunnthalen is reported for the first time from Madagascar and the Seychelles, and a comprehensive description of Dichosporidium latisporum from the Seychelles is provided. The developmental morphology of the ascocarp is the same in Chiodecton, Dichosporidium and Erythrodecton : numerous pseudoangiocarpic apothecia arise individually in a stroma. On account of the deviating ascocarp ontogeny (stromata enclosing a large, proliferating apothecium), the new genus Pulvinodecton is established to include P. kurzii (Australia, Asia) and the new P. seychellensis (the Seychelles). As in Erythrodecton , the species in Pulvinodecton contain rhodocladonic acid. Pulvinodecton differs from Erythrodecton in its fusiform rather than biclavate ascospores, the development of the ascocarp, and the peculiar structure of the pycnidia havingdeeply divided cavity that opens by more than one ostiole.