Thaxteriellopsis lignicola Sivan., Panwar & S.J. Kaur, Kavaka 4: 39 (1977) ,
≡ Chaetosphaerulina lignicola (K.S. Panwar & S.J. Kaur), J.L. Crane, Shearer & M.E. Barr, Can. J. Bot. 76(4): 608 (1998)
Saprobic on decaying inner-surface of bark of T. grandis. Sexual morph: (see Boonmee et al. 2011). Asexual morph: Colonies on natural substrate, superficial, gregarious, scattered, subhyaline hyphae. Conidiophores up to 65 μm long, 4–5 μm wide in broadest part, macronematous, mononematous, erect to slightly curved, slightly constricted at septa, arising from hyphae or creeping hyphae, arising laterally from hyphae, often in dense fascicles, simple or branched, gradually paler to sub-hyaline upwards, pale brown to reddish brown at the base, sometimes swollen at the base. Conidiogenous cells monoblastic or polyblastic, integrated, terminal, denticulate; denticles, 1.3–1.8 wide μm, truncate at apical point. Conidia 11–15μm diam when coiled, coiled into 1 1/2 spirals, loose to tight, mostly tight, Conidial filament 3–6 μm thick, 5–6-septate, tapering towards rounded apex, acropleurogenous, helicospore, hyaline to subhyaline, conico-truncate at the base.
Culture characteristics: Conidia germinating on PDA within 24 h. Germ tubes produced around conidia. Colonies on PDA reaching 11–18 mm diam. after 7 days in the dark at 25 °C (x = 14 mm, n= 5), undulate, irregular in shape, raised, fluffy, dense, slow growing, aerial at the old mycelium plugs, flat or effuse at the edge, medium sparse, brownish beige (6E3) above, brown (6 F4) from below.
Habitat: Known to inhabit dead wood (Sivanesan et al.1976) and decaying inner-surface of bark of T. grandis (current study).
Known distribution: India (Sivanesan et al. 1976) and Thailand (current study).
Material examined: THAILAND, Chiang Rai Province, Mae Chan District, on decaying inner-surface of bark of T. grandis, 1 July 2012, M. Doilom, MFLU 15–3526, living culture MFLUCC 15–0898, MKT 036, ICMP 21158, GenBank Accession No: ITS: KU144926, LSU: KU764711, SSU: KU712474, TEF1: KU872749.
Notes: Thaxteriellopsis was introduced by Sivanesan et al. (1976) with T. lignicola as the type species. The holotype (IMI 197065) was re-examined and an epitype (MFLU 10–0057) was designated and described from both sexual morph on dead wood of Zizyphus mauritiana and asexual morph in MEA (Boonmee et al. 2011). Thaxteriellopsis lignicola is associated with moorella-like asexual morphs (Subramanian and Sekar 1982). Conidia of T. lignicola collected in the current study are 11–15μm diam., helicoid, tightly coiled 1 1/2 times, and 5–6-septate, with filaments 3–6μm wide, this is similar to T. lignicola as described in Subramanian and Sekar (1982); conidia 11–15μm diam., helicoid, tightly coiled 1–1 1/2 times, 6-septate, filaments 4–6μm μm wide. This new collection MFLUCC 15–0898 is considered to be the same taxon as the T. lignicola (type) based on morphology and phylogenetic analysis.