Acidotalaromyces Houbraken, Frisvad & Samson, gen. nov.

Index Fungorum number: MB832551; Facesoffungi number: FoF

Etymology: This species requires a low pH for its growth and it was previously classified (as Penicillium lignorum) in Penicillium subgen. Biverticillium, which contains species that are nowadays mostly clas- sified in Talaromyces.

Diagnosis: Phylogenetically distinct (Fig. 1). Conidiophores talaromyces-like (Fig. 3). No or very slow growth on regular agar media (e.g., CYA, MEA) and moderate growth on acidified media (pH 3.5).

Type: Penicillium lignorum Stolk

Notes: – Acidotalaromyces is a monotypic genus and forms a unique lineage in the Trichocomaceae, phylogenetically related to Sagenomella. It requires acidified agar media (pH 3.5) for growth, as no or very limited growth occurs on regular media of slightly acidic or neutral pH. Acidotalaromyces is known from rotting wood in Europe and potentially produce biotechnologically interesting enzymes.

Fig. 1. Combined phylogeny using nine loci (RPB1, RPB2, Cct8, Tsr1, CaM, BenA, SSU, LSU, ITS). Clades in the phylogram are collapsed showing the relationship between genera and families in the Eurotiales. The phylogram is based on 263 species belonging to the order Eurotiales and 16 species from the order Onygenales (used an outgroup). The species used in the analysis can be found in Supplementary Fig. S1 and Supplementary Table S1.

Fig. 3. Drawing of Acidotalaromyces lignorum CBS 709.68 showing conidiophores and conidia; from Stolk (1969). Scale bar = 10 μm.

Species

  • Penicillium lignorum