title: Perichaena longipes, a new myxomycete from the Neotropics.
abstract: A new species of myxomycete, Perichaena longipes, is described from 56 sporocarp specimens that appeared in moist chamber cultures prepared with samples of decaying plant materials collected in Panama, Costa Rica and Brazil. This new species is distinguished from the morphologically similar species P. pedata on the basis of the much longer stipe, lighter peridium and the unique ornamentation of the capillitium. The nuc 18S ribosomal DNA sequences obtained from four specimens of P. longipes support the distinction of this new taxon and its separation from P. pedata. Furthermore, maximum likelihood phylogeny supports earlier evidence that species currently within the genus Perichaena do not form a monophyletic clade. Instead they appear to form three separate branches within the bright-spored clade. The first clade includes P. longipes together with several species of Trichia and Metatrichia, the second includes P. pedata and P. chrysosperma, and the third clade is composed of P. corticalis, P. depressa and P. luteola.
authors.affiliation: Department of Biological Sciences, University of Arkansas, Fayetteville, Arkansas 72701 lmw009@uark.edu.
authors.forename: Laura M
authors.initials: LM
authors.lastname: Walker
authors.affiliation: Department of Biotechnology, State Zooveterinary Academy, Kharkiv 62341, Ukraine.
authors.forename: Dmitry V
authors.initials: DV
authors.lastname: Leontyev
authors.affiliation: Department of Biological Sciences, University of Arkansas, Fayetteville, Arkansas 72701.
authors.forename: Steven L
authors.initials: SL
authors.lastname: Stephenson
mesh_terms: D004271:DNA, Fungal / Q000235:genetics*; D008855:Microscopy, Electron, Scanning; D009235:Myxomycetes / Q000145:classification* / Q000235:genetics* / Q000648:ultrastructure; D010176:Panama; D012331:RNA, Fungal / Q000235:genetics; D012337:RNA, Ribosomal, 18S / Q000235:genetics; D013045:Species Specificity
chemical_list: D004271:DNA, Fungal; D012331:RNA, Fungal; D012337:RNA, Ribosomal, 18S
keywords: Panama; Trichiaceae; moist chamber cultures; nuc 18S ribosomal DNA; paraphyly; phylogeny