title: The genus Alwisia (Myxomycetes) revalidated, with two species new to science.
abstract: Based on morphological investigations and a phylogeny constructed with partial sequences of the SSU rDNA gene, we revalidate the genus Alwisia and propose the combination Alwisia bombarda Berk. & Broome to be used against Tubifera bombarda (Berk. & Broome) G.W. Martin. Two new species, Alwisia morula and A. repens, are described based on material collected respectively in Costa Rica and Australia. Both new species lack a capillitium and possess individually stalked subspherical sporothecae. Alwisia repens differs from A. morula by its procumbent stalks and iridescent peridium. A comparison of 83 sequences of species in the genera Lycogala, Reticularia and Tubifera with a recent two-gene phylogeny of the bright-spored myxomycetes resulted in a similar topology of both Bayesian and maximum likelihood trees and placed A. bombarda, A. morula and A. repens in one well delimited clade within Reticulariaceae.
authors.affiliation: Department of Biotechnology, Kharkiv State Zooveterinary Academy, Akademichna str. 1, Kharkiv, Ukraine 62134 protista@mail.ru.
authors.forename: Dmitry V
authors.initials: DV
authors.lastname: Leontyev
authors.affiliation: Institute of Botany and Landscape Ecology, Ernst Moritz Arndt University Greifswald, Soldmannstr. 15, Greifswald, Germany 17487.
authors.forename: Martin
authors.initials: M
authors.lastname: Schnittler
authors.affiliation: Departamento Ciencias de la Vida (Botánica), Universidad de Alcalá, Alcalá de Henares, Madrid, España 28805.
authors.forename: Gabriel
authors.initials: G
authors.lastname: Moreno
authors.affiliation: Department of Biological Sciences, University of Arkansas, Fayetteville, Arkansas 72701.
authors.forename: Steven L
authors.initials: SL
authors.lastname: Stephenson
authors.affiliation: Walton Cottage, Upper Hartfield, East Sussex, England, TN7 4AN.
authors.forename: David W
authors.initials: DW
authors.lastname: Mitchell
authors.affiliation: Instituto de Investigaciones en Ingeniería, Universidad de Costa Rica, San Pedro de Montes de Oca, Costa Rica 11501.
authors.forename: Carlos
authors.initials: C
authors.lastname: Rojas
mesh_terms: D001315:Australia; D001483:Base Sequence; D001499:Bayes Theorem; D003364:Costa Rica; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D048690:Fruiting Bodies, Fungal; D008855:Microscopy, Electron, Scanning; D016533:Mycological Typing Techniques; D009235:Myxomycetes / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification / Q000648:ultrastructure; D010802:Phylogeny; D012337:RNA, Ribosomal, 18S / Q000235:genetics; D017422:Sequence Analysis, DNA
chemical_list: D004275:DNA, Ribosomal; D012337:RNA, Ribosomal, 18S
keywords: 18S rDNA sequences; A. repens; Alwisia morula; Australia; Costa Rica; myxomycetes