Pleosporales » Melanommataceae » Pseudostrickeria

Pseudostrickeria rosae

Pseudostrickeria rosae Wanas., Camporesi, E.B.G. Jones & K.D. Hyde, in Wanasinghe et al., Fungal Diversity: 10.1007/s13225-018-0395-7, [98] (2018)

Index Fungorum number: IF 554165; Facesofungi number: FoF 04007

Etymology: The specific epithet reflects the host genus Rosa.

Holotype: MFLU 16-0231.

Saprobic on dead spines of Rosa. Sexual morph: Ascomata 180–200 μm high 180–210 μm diam. (x̄ = 186.7 × 187.3 μm, n = 5) immersed to erumpent, solitary, scattered, globose or subglobose, dark brown to black, coriaceous, ostiolate. Ostiole 25–30 μm high 15–30 μm diam. (x̄ = 27.3 × 22.7 μm, n = 5), black, smooth, ostiolar canal filled with hyaline cells. Peridium 5–10 μm wide at the base, 5–15 lm wide at the sides, with 4–6 layers, outer layer heavily pigmented, comprising reddish to dark brown cells of textura angularis, inner layer composed of hyaline, thin-walled cells of textura angularis. Hamathecium comprising numerous, 1.7 μm wide, filamentous, branched, septate, pseudoparaphyses. Asci 90–110 × 10–13 μm (x̄ = 102.3 × 11.3 μm, n = 30), 8-spored, bitunicate, fissitunicate, cylindrical, pedicellate, thick-walled at the apex, with minute ocular chamber. Ascospores 13–18 × 5–7 μm (x̄ =  16.3 × 6.2 μm, n = 50), overlapping 1–2-seriate, muriform, ellipsoidal, upper part wider than the lower part, 3–4 transversely septate, with 2–3 vertical septa, longitudinal septa often in mid cells only, slightly constricted at the septa, initially hyaline, becoming brown at maturity, ends sometimes paler, with rounded ends, wall firm, dark, smooth-walled, guttulate, without a mucilaginous sheath. Asexual morph: Undetermined.

Material examined: ITALY, Province of Forlı`-Cesena, Converselle, Castrocaro Terme e Terra del Sole, on dead aerial spines of Rosa canina (Rosaceae), 3 December 2014, Erio Camporesi IT 2198 (MFLU 16-0231, holotype); ex-type living culture, MFLUCC 17-0643.

GenBank Numbers: ITS: MG828954, LSU: MG829065, SSU: MG829169, TEF: MG829234.

Notes: Pseudostrickeria rosae is similar to P. muriformis and P. ononidis in having muriform ascospores and subglobose ascomata. Their asci and ascospore shapes are different. Pseudostrickeria muriformis and P. ononidis have cylindric-clavate asci, a biseriate ascospore arrangement and asymmetrical ascospores with one side flattened, with 1–3-longitudinal septa (Tian et al. 2015), while P. rosae has cylindrical asci, a uniseriate ascospore arrangement and symmetrical ascospores with 1-longitudinal septum.

 

Figure x. Pseudostrickeria rosae (MFLU 16-0231, holotype) a Ascomata on host spines. b Section of ascoma. c Ostiole. d Peridium. e–i Asci. j–n Ascospores. Scale bars: b = 50 μm, c–i = 20 μm, j–n = 10 μm.

 

References:

 

Tian Q, Liu JK, Hyde KD, Wanasinghe DN et al. 2015 Phylogenetic relationships and morphological reappraisal of Melanommataceae (Pleosporales). Fungal Diversity 74, 267–324.

 

Wanasinghe DN, Phukhamsakda C, Hyde KD, Jeewon R et al. 2018 – Fungal diversity notes 709–839: taxonomic and phylogenetic contributions to fungal taxa with an emphasis on fungi on Rosaceae. Fungal diversity 89, 1–236.

 

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