99 Some reallocations of Stenella species to Zasmidium Uwe Braun, Pedro W. Crous, Konstanze Schubert & Hyeon-Dong Shin Abstract: Braun, U., Crous, P.W., Schubert, K. & Shin, H.-D. 2010: Some reallocations of Stenella species to Zasmidium. Schlechtendalia 20: 99 –104. Based on phylogenetic as well as phenotypic characters, Zasmidium proved to be the oldest genus name for Stenella-like anamorphs belonging to the Mycosphaerellaceae. Stenella s. str. with S. ara- guata as type species is phylogenetically part of the Teratosphaeriaceae. Furthermore, the two genera are also morphologically somewhat distinct by differences in the structure of the conidiogenous loci, being planate in Zasmidium, and more pileate in Stenella. Due to the new generic nomenclature and taxonomy within this complex of hyphomycetes, some new reallocations of former Stenella species to Zasmidium are necessary. Zusammenfassung: Braun, U., Crous, P.W., Schubert, K. & Shin, H.-D. 2010: Einige neue Zuordnungen von Stenella-Arten zu Zasmidium. Schlechtendalia 20: 99 –104. Auf Grundlage phylogenetischer und phänotypischer Merkmale konnte gezeigt werden, dass Zasmidium der älteste Gattungsname für Stenella-artige Anamorphen der Mycosphaerellaceen ist. Stenella s. str., mit S. araguata als Typusart, gehört phylogenetisch zu den Teratosphaeriaceen. Darüber hinaus sind die beiden Gattungen auch morphologisch in der Struktur der konidienbildenden Loci etwas verschieden, abgeflacht in Zasmidium und mehr pileat in Stenella. Aufgrund der neuen Gattungsnomenklatur und -Taxonomie innerhalb dieses Komplexes von Hyphomyzeten sind einige Umkombinationen von früheren Stenella-Arten in Zasmidium notwendig. Key words: Cercosporoid hyphomycetes, nomenclature. The anamorph genus Stenella Syd. has traditionally been linked to teleomorphs accommodated in Mycosphaerella Johanson (Crous & Braun 2003, Crous et al. 2004, 2006). However, recent phylogenetic studies have shown that Mycosphaerella is polyphyletic (Crous et al. 2007), and that many of these anamorph lineages re- present distinct genera with Mycosphaerella-like teleomorphs, clustering in different families in the Capnodiales (Crous et al. 2009a–c). Stenella is a cercosporoid hypho- mycete genus for species characterised by having superficial, verruculose hyphae with solitary to aggregated conidiophores, conidiogenous cells with conspicuous conidiogenous loci (thickened, darkened and refractive), and conidia formed singly or in chains, with thickened, darkened and refractive hila (Crous & Braun 2003). Recently some species with similar conidia, but lacking superficial mycelium have also been placed in Stenella (Braun & Crous 2005, Shivas et al. 2009). Such spe- cies were previously placed in Stenellopsis B. Huguenin, but this genus was reduced to synonymy with Stenella by Braun & Crous (2005), a conclusion supported by results of molecular sequence analyses (see Shivas et al. 2009). In a subsequent