Arnium Nitschke, Bot. Ztg. 31: 450 (1873)
MycoBank number: MB 313; Index Fungorum number: IF 313; Facesoffungi number: FoF 13291; 29 morphological species (Species Fungorum 2020), 9 species with sequence data.
Type species – Arnium lanuginosum Nitschke
Notes – Arnium has pyriform to ellipsoid ascomata, cylindrical asci and oblong to oval ascospores (Nitschke 1873, Kruys et al. 2015). Kruys et al. (2015) found that species of Arnium were dispersed into several groups and interspersed in Lasiosphaeriaceae sensu lato (Fig. 23).
Figure 23 – Phylogram generated from maximum likelihood analysis based on combined LSU, ITS, tub2 and rpb2 sequence data of Sordariales. Related sequences were taken from Wang et al. (2016b). Two hundred and fifty-seven strains are included in the combined analyses which comprised 2717 characters (855 characters for LSU, 480 characters for ITS, 860 characters for tub2, 522 characters for rpb2) after alignment. Members of Amphisphaeriales are used as outgroup taxa. Single gene analyses were carried out and the phylogenies were similar in topology and clade stability. The best RAxML tree with a final likelihood value of -59082.079074 is presented. Estimated base frequencies were as follows: A = 0.238795, C = 0.266829, G = 0.275292, T = 0.219085; substitution rates AC = 1.483472, AG = 3.436969, AT = 1.859704, CG = 1.064423, CT = 6.934931, GT = 1.000000; gamma distribution shape parameter a = 0.757314. Bootstrap support values for ML greater than 50% are given near the nodes. Ex-type strains are in bold. The newly generated sequences are indicated in blue.
Figure 23 – Continued.
Figure 23 – Continued.
Species