Capnodiales » Mycosphaerellaceae » Pseudocercospora

Pseudocercospora maetaengensis

Pseudocercospora maetaengensis J.F. Li & R. Phookamsak, in Hyde et al., Fungal Diversity 100: 16 (2020)

Index Fungorum number: IF556890;, Facesoffungi number: FoF07054

 

Sexual morph: Undetermined. Asexual morph: Synnemata 100–130 μm high, 5.9–8 μm wide, erect, simple, unbranched, dark brown to black, comprising various conidiophores twisted together in synnemata, with bubble-like, tightly interwoven, branched hyphae, compacted into an elongate bundle. Conidiophores 100–130 μm long × 1.8–3.5 μm diam. (x̄= 124 × 2.6 μm, n = 10). Conidiogenous cells 2.5–3 μm long × 1.6–2 μm diam. ( ̄x̄ = 2.8 × 1.8 μm, n = 20), monoblastic, integrated, terminal, determinate or percurrent, cylindrical, doliiform, hyaline, smooth, thin-walled. Conidia 13–28 μm long × (2.5–)2.7–3.6(–4) μm diam. ( ̄x̄ = 21 × 3.1 μm, n = 20), acrogenous, solitary, hyaline, ellipsoidal, clavate, 2–4-septate, dry, simple, straight, curved, fusiform, smooth- and

thin-walled.

 

Culture characteristics: Conidia germinating on PDA within 14 h and germ tubes produced from top cells. Colonies growing on PDA, hairy or cottony, grey to dark grey, reaching 5 mm in 20 days at 25 °C, mycelium superficial, effuse, grey to dark grey hyphae; Asexual spores and sexual

spores were not formed within 60 days.

 

Habitat: -

 

Known distribution: -

 

Material examined: THAILAND, Chiang Mai Province, Mae Teang District, Mushroom Research Center (M.R.C.), on unidentified fallen dead leaves, 25 November 2013, X. Zeng (MFLU 14-0206, holotype), ex-type living culture MFLUCC 14-0411.

 

GenBank Accession No: ITS = MN648323, LSU = MN648328, SSU = MN648320, TEF1-α = MN821071.

 

Notes: Morphologically, Pseudocercospora maetaengensis resembles P. vitis in having septate, straight or slightly curved conidia, with a rounded apex and conidiophores grouped in synnema (Ellis 1971). However, P. maetaengensis is unique in its short, dark synnemata and smaller, less septate, subhyaline, fusiform conidia. Phylogeny based on a combined ITS and LSU sequence dataset reveals P. maetaengensis as an independent lineage distinct from P. vitis and further differs from other species in Pseudocercospora with significant support (77% ML, 0.98 BYPP). Therefore, a new species, P. maetaengensis is established.

 

Figure 8. Pseudocercospora maetaengensis (MFLU 14-0206, holotype). a, b Appearance of fungal colonies on host substrate. c, e–g Close up conidiophores and conidiogenous cells. d Conidiophores. h–o Conidia. p Germination of conidia. q–r Culture. Scale bars: a = 1 cm, b = 50 μm, c–d, e–g = 10 μm, h–p = 5 μm, q–r = 0.5 cm

 

 

Reference:

 

Hyde KD, Dong Y, Phookamsak R, Jeewon R et al. (2020) Fungal diversity notes 1151–1276: taxonomic and phylogenetic contributions on genera and species of fungal taxa. Fungal Divers 100:5–277.

 

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