Contributions towards a monograph of Phoma (Coelomycetes) — III. 1. Section Plenodomus: Taxa often with a Leptosphaeria teleomorph

Twenty-six species of Phoma, characterized by the ability to produce scleroplectenchymatous pycnidia (and often also pseudothecia) are documented and described. An addendum deals with five atypical species, but which on account of literature data may be related. The following new taxa are proposed: Phoma acuta subsp. errabunda (Desm.) comb. nov. (teleomorph Leptosphaeria doliolum subsp. errabunda subsp. nov.), Phoma acuta subsp. acuta f. sp. phlogis (Roum.) comb. nov., Phoma congesta spec. nov. and Phoma vasinfecta spec. nov. Detailed keys and indices on host-fungus and fungus-host relations are provided and short comments on the ecology and distribution of the taxa are given.