Ceramothyrium thailandicum Chomnunti & K.D. Hyde

Zeng, Xiang-Yu, Wen, Ting-Chi, Chomnunti, Putarak, Liu, Jian-Kui, Boonmee, Saranyaphat & Hyde, Kevin D., 2016, Ceramothyrium longivolcaniforme sp. nov., a new species of Chaetothyriaceae from northern Thailand, Phytotaxa 267 (1), pp. 51-60 : 58

Ceramothyrium thailandicum Chomnunti & K.D. Hyde ( Fig 3 )

Epiphytic and epiphyllous on dried leaves of an unidentified host. Mycelial pellicle subiculum-like, brownish to blackish, closely reticulate, slightly constricted at septa, radiating outwards, anastomosing at central ostiole, with cells of the hyphal network. Ascomata 330–370 μm (x = 350 μm, n = 10) in diameter, superficial, solitary or scattered, coriaceous, black, globose, covered by a subiculum or layer, with a circumferential space around the maturing ascomata. Peridium light brown, with compressed, hyaline, inner cells of textura prismatica. Asci 55–65 × 20–25 μm (x = 59 × 24 μm, n = 20), 8-spored, bitunicate, pyriform to oboviod, short pedicellate. Ascospores 20–25 × 5–7 μm (x = 24 × 6 μm, n = 30), 2-seriate, hyaline, subcylindrical to slightly clavate, 5-septate, not constricted at the septum, the two central cells slightly longer than others, rounded at the apex, tapering at the base, lacking of sheath.

Material examined: — THAILAND, Chiang Mai, Mae Taeng, Pa Pae, Bahn Pa Dheng, 128 Moo 3, Mushroom Research Centre, on dried leaves of an unidentified plant, 22 November 2013, Xiang-Yu Zeng ( MFLU 13-0632).

Notes: — Ceramothyrium thailandicum was described and introduced by Chomnunti & Hyde (2012) with mostly 8-septate, clavate ascospores and a distinct mucilaginous sheath. Phylogenetic analyses showed no difference between these two collections of C. thailandicum ( MFLU 13-0632 and MFLU 10-0008). The ITS and LSU sequence data are 99% identical. However, there are some differences in the respect of morphology. C. thailandicum ( MFLU 13-0632) was found on dead leaves and has 5-septate ascospores lacking a sheath, while the type was found on living leaves, with 7–9-septate ascospores, with a mucilaginous sheath.

Figures

FIGURE 3. Ceramothyrium thailandicum (MFLU 13-0632). a. Host leaf. b.Ascomata on host leaf. c. Colony (black spots) distribution on host leaf. d. Squash of ascoma. e. Ascoma in cross section. f. Mycelial pellicle. g–h. Young ascus. i. Mature ascus. j–l. Ascospores. Scale Bars: b = 200 μm, d = 100 μm, e = 50 μm, f–i = 20 μm, j–l = 10 μm.