Pleosporales » Didymosphaeriaceae » Neokalmusia

Neokalmusia didymospora

Neokalmusia didymospora D.Q. Dai & K.D. Hyde, Sydowia 68: 20 (2016)

Facesoffungi number: FoF 00061

 

Sexual morph: Ascomata 420–460 µm high, 140–220 µm diameter, immersed and raising host tissue, becoming erumpent, solitary, scattered, globose, brown to dark brown, ostiolate, wide, brown to reddish brown, smooth. Peridium 20–35 µm, wider at the apex and thinner at the base, composed of 4–6-layers of dark brown, cells of textura angularis, cells towards the inside lighter, at the outside, darker, fused with the host tissues. Hamathecium comprising numerous, 1.5–1.8 µm wide, filamentous, branched, septate, pseudoparaphyses. Asci 135–140 × 8–9.5 µm, 8-spored, bitunicate, fissitunicate, elongate-clavate to short cylindrical, long pedicellate, thick-walled at the apex, with a minute ocular chamber. Ascospores 12–13.5 × 5–5.5 µm, overlapping 1–2-seriate, hyaline to light brown when immature, becoming brown to blackish brown when mature, ellipsoidal, unequally 1-septate and strongly constricted at the septum, with the upper cell wider and pointed and lower cell longer and rounded, smooth-walled, thick-walled, without a mucilaginous sheath. Asexual morph: Undetermined.

 

Host and habitat: on dead culm of bamboo (Dai et al. 2015), on decaying stems of Microstegium sp. (Poaceae) (Hyde et al. 2020).

 

Known distribution: Thailand, Chiang Rai Province (Dai et al. 2015), China, Yunnan Province, Kunming City (Hyde et al. 2020).

 

Material examined: China, Yunnan Province, Kunming City, KIB premises, on decaying stems of Microstegium sp. (Poaceae), 20 October 2016, A. Karunarathna, AKKIB 48 (MFLU 17–0371, KUN 97364, new host and geographic record); living culture, MFLUCC 17–381; KUMCC 16–0233.

 

GenBank Accession No: LSU: MN989184.

 

Notes: Our strain is phylogenetically related to N. didymospora (Hyde et al. 2020) and both are morphologically similar. Neokalmusia didymospora is a new host and geographic record.

Figure X. Neokalmusia didymospora (MFLU 17–0371, new host and geographic record). a–c Appearance of ascoma on host d Longitudinal section of ascoma e Longitudinal section of ostiole f Peridium g Pseudoparaphyses h–j Asci k–o Ascospores p Germinating ascospore. Scale bars: d = 50 µm, e = 50 µm, f = 10 µm, g = 5 µm, h–j = 20 µm, k–p =10 µm.

Reference:

1. Dai DQ, Bahkali AH, Ariyawansa HA, Li WJ et al. 2015 – Neokalmusia didymospora (Didymosphaeriaceae), a new species from bamboo. Sydowia 68, 17–25.
2. Hyde KD, de Silva NI, Jeewon R, Bhat DJ, et al. 2020 – AJOM new records and collections of fungi: 1-100. Asian Journal of Mycology 3(1), 22–294.

 

 

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