ISSN (print) 0093-4666 © 2012. Mycotaxon, Ltd. ISSN (online) 2154-8889 MYCOTAXON http://dx.doi.org/10.5248/119.419 Volume 119, pp. 419–429 January–March 2012 Abrachium, a new genus in the Clathraceae, and Itajahya reassessed Tiara Sousa Cabral1, Paulo Marinho2, Bruno Tomio Goto3 & Iuri Goulart Baseia*3 1Programa de Pós Graduação em Ciências Biológicas, 2Departamento de Biologia Celular e Genética, & 3Departamento de Botânica, Ecologia e Zoologia, Universidade Federal do Rio Grande do Norte, PO Box 59072-970, Natal, RN, Brazil * Correspondence to:
[email protected] Abstract — Molecular and morphological analyses have elucidated phylogenetic relationships of two remarkable species in the Phallales: Aseroe floriformis and Phallus roseus. Genes from ATPase subunit 6 (atp6), the nuclear large subunit ribosomal DNA (nuc-LSU), and the second largest RNA polymerase II subunit (RPB2) underwent Bayesian and parsimony molecular analyses. Molecular datasets, combined with morphological characters, support a new genus (Abrachium for Aseroe floriformis), reassessment of Itajahya, and emendation of Clathraceae. Key words — Phallomycetidae, gasteroid fungi, neotropics, phylogeny, evolution Introduction Fischer (1898-99) established the order Phallales, initially composed of two families, Clathraceae and Phallaceae, to separate representatives with branched and unbranched basidiomata. Clathraceae, established by Chevallier (1826), encompasses the “lattice stinkhorns”, fungi that exhibit a peculiar basidioma featuring tubular or mucilaginous arms either interconnected or intertwined in a network or comprising a receptacle with vertical arms either connected at the top or arched in the shape of a star (Miller & Miller 1988). Pegler & Gomez (1994) included twelve genera within the family (Blumenavia, Linderiella, Pseudocolus, Anthurus, Aseroe, Lysurus, Clathrus, Ileodictyon, Simblum, Colus, Neolysurus and Kalchbrennera).