Microthyrium propagulensis H.X. Wu & K.D. Hyde, 2014

Microthyrium propagulensis H.X. Wu & K.D. Hyde , sp. nov. MycoBank: MB 805473 ( Fig. 2 View FIGURE 2 )

Type: — CHINA. Yunnan Province: Mount Gaoligong , on decaying leaves of Castanopsis histrix Miq. (Fagaceae) 18 August 2011, Y.M. Li ( IFRD 9037 , holotype) .

Etymology: —from the Latin propagulum, in reference to the appearance of the ascospores as propagules for dispersal.

Differs from M. microscopicum based on saprobic on decaying leaves. Mycelium superficial, abundant, almost colourless. Sexual state: Thyriothecia, on the upper and lower of leaves, orbicular, up to 270 µm diam, solitary or often gregarious, superficial, membranaceous, brown to light brown, with a poorly developed basal layer, with a prominent darker central ostiole, in section lenticular. Upper wall comprising cells of textura epidermoidea, radiating outwards in parallel rows from the ostiole. Hamathecium comprising asci inclined from the base and rim towards the central, pseudoparaphyses absent, possibly deliquescing early. Asci 41–56 × 5–8 µm (x = 49.8 × 6.7 µm, n = 15), 8-spored, numerous, bitunicate, clavate to cylindrical, with a 3–4 × 2–3 µm pedicel. Ascospores 10–11.5 × 3–4 µm (x = 10.9 × 3.4 µm, n= 15), 2–3-seriate, ellipsoidal to ovate, with rounded ends, hyaline, 1- septate, septum in lower part, not constricted at the septum, upper cell larger with 2 distinct guttules, apex with 2 cilia, which lie downloads at an 45° angle to the ascospore, cilia 5.4–7.3 µm long. Asexual state: Unknown.