Arrhenia and Rimbachia, expanded generic concepts, and a reevaluation of Leptoglossum with emphasis on muscicolous North American taxa

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Abstract
The generic limits of Arrhenia Fries, Geotus Pil. & Svr., Leptoglossum Karsten, Leptotus Karst., Mniopetalum Donk & Singer, Phaeotellus Kühn. & Lam., Pleuromycenula Singer, and Rimbachia Patouillard are examined. Two genera, Arrhenia and Rimbachia, are recognized. Keys for the species in these genera are presented and reports of the various species are reevaluated based largely on a restudy of original materials. New combinations in Arrhenia are based on Agaricus fissus Leysser, Merulius lobatus Pers., Helvella retiruga Bull., Leptoglossum alnetorum Singer, and Cantharellus spathulatus Fr. New species combinations in Rimbachia are based on Cyphella arachnoidea Peck, Agaricus bryophilus Pers., Cyphella muscicola var. neckerae Fr., Cantharellus furfuraceus Petch, and Pleuromycenula ellipsoidea Singer. Rimbachia paludosa sp. nov. is described from Ontario, Canada. Leptoglossum muscigenum (Bull.:Fr.) Karst. is a synonym of A.spathulata (Fr.) Redhead, Mniopetalum globisporum Donk & Singer is a synonym of R.arachnoidea (Peck) Redhead, Mniopetalum distinctum Horak is a synonym of R.furfuracea (Petch) Redhead, Leptoglossum candidum Reid is a synonym of R.neckerae (Fr.) Redhead, and Geotus glaucus sensu Pilát & Svrček 1954 is actually A.fissa (Leyss.) Redhead. Mniopetalum bisporum Singer is reduced to a subspecies of R. arachnoidea and Mniopetalum megalosporum Singer to a subspecies of R. neckerae (Fr.) Redhead. In North America, Arrhenia auriscalpium is an arctic–alpine species, A. lobata is an arctic–boreal–alpine species, and A. acerosa and A. retiruga are boreal species. Rimbachia arachnoidea and R. bryophila are boreal species. Arrhenia spathulata and A. fissa are known only from Europe. All Arrhenia and Rimbachia species are bryophiles. Cantharellus polycephalus Bres. is transferred to Pterygellus Corner and Leptoglossum bambusicola Corner is transferred to Marasmiellus Murrill. Pseudocraterellus leptoglossoides Corner is a basidiolichen and the type of a new genus, Semiomphalina Redhead. Pleuromycenula circularis Singer is transferred to Helotium Tode, and P. flava Singer is the type of a new genus, Flabellimycena Redhead. Campanella inquilina Romagnesi, based on Leptoglossum conchatum sensu Romagnesi non Velenovský, is described as new. Cantharellus prescotii Weinm., the correct name for Cantharellus albidus auct. non Fries, is transferred to Gerronema.