Acanthonitschkea Speg., Anal. Mus. nac. B. Aires, Ser. 3 17(10): 116 (1908)
MycoBank number: MB 12; Index Fungorum number: IF 12; Facesoffungi number: FoF 10307; 9 morphological species (Species Fungorum 2020), 2 species with sequence data.
Type species – Acanthonitschkea argentinensis Speg.
Notes – Acanthonitschkea argentinensis has spinate ascomata and clavate asci with reniform ascospores (Spegazzini 1908). It was considered as a member of Coronophoraceae (Müller & von Arx 1973, von Arx 1981a, Subramanian & Sekar 1990). Mugambi & Huhndorf (2010) transferred the genus to Nitschkiaceae based on multi-gene analysis. The genus is closely related to Nitschkia in Fig. 15.
Figure 15 – Phylogram generated from maximum likelihood analysis based on combined LSU, ITS, cmdA, rpb2, tef1 and tub2 sequence data for Hypocreales. Two hundred sixty six strains are included in the combined analysis which comprised 4731 characters (890 characters for LSU, 906 characters for ITS, 557 characters for cmdA, 862 characters for rpb2, 1163 characters for tef1, 348 characters for tub2) after alignment. 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 – 143259.087299 is presented. Estimated base frequencies were as follows: A = 0.238481, C = 0.265503, G = 0.275795, T = 0.220220; substitution rates AC = 1.361350, AG = 3.162200, AT = 1.584547, CG = 1.000927, CT = 7.415164, GT = 1.000000; gamma distribution shape parameter a = 0.592521. Bootstrap support values for ML greater than 50% are given near the nodes. The tree is rooted with Achaetomium macrosporum CBS 532.94, Chaetomium elatum CBS 374.66, Gelasinospora tetrasperma AFTOL-ID 1287, and Neurospora crassa ICMP 6360. Ex-type strains are in bold. The newly generated sequences are indicated in blue.