@ARTICLE{TreeBASE2Ref2117, author = {Rebecca Creamer and Sarah Hambleton and Jennifer McLain-Romero and Barry M. Pryor and Robert A. Shoemaker}, title = {Undifilum, a new genus for endophytic Embellisia oxytropis and parasitic Helminthosporium bornmuelleri on legumes.}, year = {2008}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Canadian Journal of Botany}, volume = {}, number = {}, pages = {}, abstract = {Fungal endophytes of Oxytropis kansuensis from China, previously described as Embellisia oxytropis, and endophytes of locoweed (Oxytropis and Astragalus spp.) from the United States are reported here as members of a new genus in the Pleosporaceae, Undifilum, based on morphological and molecular analyses. Morphological comparisons among recovered isolates revealed characters that are somewhat similar to those of the genus Embellisia including conidia ovate to obclavate to long ellipsoid, straight or slightly to decidedly inequilateral, with occasionally one or two cells distinctly swollen. Moreover, transepta are occasionally thickened, dark, and rigid in comparison to the exterior conidium wall. However, parsimony analysis of sequences from ITS1/5.8S/ITS2, glyceraldehyde-3-phosphate dehydrogenase gene, and mitochondrial small subunit rDNA datasets revealed that the Oxytropis/Astragalus endophytes formed a clade distinct from existing Stemphylium, Alternaria, Nimbya, Ulocladium, and other Embellisia species. A second taxon, Helminthosporium bornmuelleri, was reexamined and found to posses similar morphological features to those of the Oxytropis/Astragalus isolates. Sequence analysis placed this taxon in the same clade with high bootstrap support. The distinct morphology and genetics of these taxa, combined with the endophytic habit and production of the alkaloid swainsonine of isolates recovered from locoweed, demonstrates that these fungi, all recovered from legumes, represent a new genus, herein described as Undifilum. The two species now placed in this genus are redescribed as U. oxytropis and U. bornmuelleri.} }

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