Micropeltidales » Micropeltidaceae » Micropeltis

Micropeltis phetchaburiensis

Micropeltis phetchaburiensis Dayarathne & K.D. Hyde, in Phookamsak et al., Fungal Diversity Notes: 10.1007/s13225-019-00421-w, [99] (2019)

Index Fungorum number: IF IF555294     Facesoffungi number: FoF04841


Sexual morph: Thyriothecia 75–90 × 140–160 µm diam. ( = 80 × 150 lm, n = 5), solitary, superficial on the surface of hosts, circular, membranous, black, easy to detached, base poorly developed, with a central, irregular ostiole. Upper walls comprising an irregular, meandering arrangement of hyphae, from the central ostiole to the outside. Peridium 35–50 µm wide, composed of two strata, the outer stratum having bluish to black, occluded walls, inner stratum of greenish to hyaline, flattened cells. Hamathecium with evanescent pseudoparaphyses. Asci 50–68 × 11–16 µm ( = 60 × 14 µm, n = 10), 8-spored, bitunicate, broadly cylindrical to fusiform, with a short pedicel, apically rounded with ocular chamber. Ascospores 16–20 × 2–4 µm ( = 18 × 3 µm, n = 20), overlapping 2–3-seriate, hyaline, clavate, 3-septate, constricted at the septa, narrowly rounded at both ends, smooth-walled, surrounded by a mucilaginous sheath. Asexual morph: Undetermined.


Culture characteristics: Colonies on PDA reaching 25 mm diam after 1 week at 20–25 °C, colonies medium sparse, circular, flat, surface slightly rough with edge entire, margin well-defined, cottony to fairly fluffy, colony from above: greyish green; reverse light brown.


Material examined: THAILAND, Phetchaburi Province, Prachuap Khiri Khan, 77230 Bang Saphan, Ron Thong, on living leaves of an unidentified plant, 14 December 2015, M. Dayarathne, KLAP011 (MFLU 18-1408, holotype; HKAS102010, isotype).


GenBank Accession No: LSU = MH656405, SSU = MH656406.


Notes: Micropeltis phetchaburiensis resembles M. dendrophthoes Hongsanan & K.D. Hyde and M. zingiberacicola H.X. Wu & K.D. Hyde in forming broadly cylindrical to fusiform asci and hyaline, clavate, septate ascospores (Wu et al. 2011; Hongsanan et al. 2015). Micropeltis phetchaburiensis can be distinguished from M. dendrophthoes and M. zingiberacicola in having 3-septate ascospores with the 4 cells being equal in length and width, while ascospores of the other two species are 4–5-septate and enlarged at the first cell and relatively longer lower end cells. In our phylogenetic analyses of a combined LSU and SSU sequence dataset, M. phetchaburiensis forms a basal lineage to M. dendrophthoes and M. zingiberacicola with moderate bootstrap support (97% ML and 93% MP).