ABSTRACT: The taxonomy of several species previously assigned to Omphalina sensu lato or Gerronema is reevaluated in light of recent molecularly based phylogenetic hypotheses. One surmised clade, herein informally labelled the rickenelloid clade, falls outside of the Agaricales using nLSU data. Analysis of how best to classify these taxa results in the establishment of two new genera, Loreleia (type: Agaricus postii) and Sphagnomphalia (type: Clitocybe brevibasidiata), and the renaming of a later homonym, Jacobia nom. illeg., as Contumyces (type: Clitocybe rosella). New combinations are proposed and an interim key to these genera is provided.

KEYWORDS: nLSU, Omphalina, Gerronema, Rickenella, Cantharellopsis, Contumyces, Loreleia, Sphagnomphalia, Cotylidia

NOMENCLATURAL NOVELTIES:
Contumyces Redhead, Moncalvo, Vilgalys & Lutzoni, p. 161
Contumyces brunneolilacina (Contu, Bon & Curreli) Redhead, Moncalvo, Vilgalys & Lutzoni, p. 162
Contumyces rosella (M. Moser) Redhead, Moncalvo, Vilgalys & Lutzoni, p. 161
Contumyces vesuviana (F. Brig.) Redhead, Moncalvo, Vilgalys & Lutzoni, p. 162
Loreleia Redhead, Moncalvo, Vilgalys & Lutzoni, p. 162
Loreleia marchantiae (Singer & Clémençon) Redhead, Moncalvo, Vilgalys & Lutzoni, p. 162
Loreleia postii (Fr.) Redhead, Moncalvo, Vilgalys & Lutzoni, p. 162
Loreleia roseopallida (Contu) Redhead, Moncalvo, Vilgalys & Lutzoni, p. 162
Sphagnomphalia Redhead, Moncalvo, Vilgalys & Lutzoni, p. 162
Sphagnomphalia brevibasidiata (Singer) Redhead, Moncalvo, Vilgalys & Lutzoni, p. 163