title: Delimitation of Umbelopsis (Mucorales, Umbelopsidaceae fam. nov.) based on ITS sequence and RFLP data.
abstract: In a continuation of studies started by de Ruiter et al. (1993), all known species of the Mortierella isabellina-group (Micromucor/Umbelopsis clade of O'Donnell et al. 2001) and a few other Mucorales and species of Mortierella were investigated by RFLP (including ITS1, 5.8S, ITS2 and the 5' end of the large subunit rDNA gene) and ITS1 sequence analyses. This monophyletic group is unrelated to Mortierella and is only distantly related to the core group of the Mucoraceae. M. longicollis falls outside the Umbelopsis clade. Molecular data resolved two subclades within the M. isabellina-group; however, they are not correlated with any differences in sporangial wall and shape, spore pigmentation and shape, or sporangiophore branching. Therefore we subsume all taxa in one genus, Umbelopsis. The new family Umbelopsidaceae and the new combinations U. isabellina, U. ramanniana, and U. autotrophica are proposed.
authors.affiliation: University of Sydney at Westmead Hospital, Centre for Infectious Diseases & Microbiology, Molecular Mycology Laboratory, Westmead, NSW 2145, Australia.
authors.forename: Wieland
authors.initials: W
authors.lastname: Meyer
authors.forename: Walter
authors.initials: W
authors.lastname: Gams
mesh_terms: D004271:DNA, Fungal / Q000235:genetics; D021903:DNA, Ribosomal Spacer / Q000235:genetics; D020459:Genes, rRNA; D009090:Mucorales / Q000145:classification* / Q000166:cytology / Q000235:genetics*; D016533:Mycological Typing Techniques; D010802:Phylogeny; D012150:Polymorphism, Restriction Fragment Length; D017422:Sequence Analysis, DNA
chemical_list: D004271:DNA, Fungal; D021903:DNA, Ribosomal Spacer