Arthrocatena tenebrosa Egidi & Selbmann, in Crous, Schumacher, Akulov, Thangavel, Hernández-Restrepo, Carnegie, Cheewangkoon, R; Wingfield, Summerell, Quaedvlieg, Coutinho, Roux, Wood, Giraldo & Groenewald, Fungal Systematics and Evolution 3: 126 (2019)

Index Fungorum number: IF 829385, MycoBank number: MB 829385, Facesoffungi number: FoF 11413

Synonym – Arthrocatena tenebrio Egidi & Selbmann, Fungal Diversity 65: 159. 2014. Nom. inval., Art. 40.7 (Shenzhen).

Etymology – Named after dark, arthric conidia in chains.

Description Colonies growing slowly, up to 18 mm in diameter, black in reverse, velvety, and green in obverse, hard and compact, cerebriform, lobed with regular margin. Torulose hyphae dark brown, branched, consisting of spherical and cylindrical cells with thick walls; cells about 3–5 μm wide and developing 2 or more longitudinal and oblique septa. Conidia resulting from arthric secession, relatively abundant, dark brown, thick-walled, initially barrel-shaped, rounding off to nearly spherical after liberation, 6.0–11.5 × 3.0–5.5 μm, sometimes with a median septum. Teleomorph unknown.

Typus – Italy, Monte Rosa, Punta Indren, from rock (holotype CBS 136100, culture and specimen preserved as metabolically inactive).

Notes – The isolate originated from a cold environment and showed a position in a single, long branch of Clade II-E (Fig 2), suggesting the affiliation to a separate species.

Figure 1 – Arthrocatena tenebrio CBS 136100 = CCFEE 5413. d Colony appearance after 3 weeks of incubation. eg Thick-walled conidia resulting from arthric conidiogenesis. Scale bars 10 μm

Figure 2 – Two-gene phylogenetic tree of representative families of Capnodiales, resulting from a Bayesian analysis of the nucLSU, RPB2, ITS, BT2 sequence alignment. Bayesian probabilities of ≥ 95 % are provided above corresponding nodes and in a thicker line. Clades and groups are indicated with colored blocks. Strains isolated from rocks are indicated with red text and species described here for the first time are in bold. Arrows indicate related figures