Pleosporales » Didymosphaeriaceae » Pseudocamarosporium

Pseudocamarosporium camporesii

Pseudocamarosporium camporesii Q. Tian & K.D. Hyde, in Hyde et al., Fungal Diversity 100: 54 (2020) Index Fungorum number: 556933; Facesofungi number: FoF 06858

            Etymology: Named in honor of Mr. Erio Camporesi who made an immense contribution to fungal investigation and collection.

Holotype: MFLU 16-2134

Saprobic on a dead stem of Quercus cerris. Sexual morph: Undetermined. Asexual morph: Coelomycetous.Conidiomata 300–400 μm diam., 180–250 μm high, pycnidial, solitary to gregarious, immersed to semi-immersed, erumpent to superfcial at maturity, unilocular, globose to subglobose, sometimes depressed, ostiolate. Ostiole single, centrally located, papillate. Pycnidial walls 18–30 μm, multi-layered, with 3–5 outer layers of brown-walled cells of textura angularis, with innermost layer thin, hyaline. Conidiophores reduced to conidiogenous cells. Conidiogenous cells blastic, phialidic, hyaline, cylindrical, smooth, from the innermost layer of conidioma wall. Conidia 15–20(–30) × 8–12(–14) μm ( x̄ = 18.5 × 10.3 μm, n = 20), oblong to ellipsoidal, initially hyaline, brown to dark brown at maturity, muriform, with 1–3 transverse septa, with 1–3 longitudinal septa, constricted at the septa, straight or infrequently slightly curved, narrowly rounded at both ends, smooth-walled, without mucilaginous sheath. Conidial secession schizolytic.

Material examined: ITALY, Province of Arezzo [AR], Montemezzano-Stia, on dead aerial branch of Quercus cerris L. (Fagaceae), 7 July 2016, E. Camporesi, IT 3028 (MFLU 16-2134, holotype).                 

GenBank Numbers: ITS: MN653128; LSU: MN653129; SSU = MN653127.

Note: A new camarosporium-like taxon, Pseudocamarosporium camporesii was collected from Italy on a dead stem of Quercus cerris during an investigation on the diversity of fungi in Italy. It is characterised by pycnidial, ostiolate conidiomata, blastic, phialidic conidiogenous cells and brown, muriform conidia that ft well within the species concept of Pseudocamarosporium in Didymosphaeriaceae. Based on ITS, LSU and SSU sequences analyses from the ribosomal genes for Pseudocamarosporium our new taxon belongs to Pseudocamarosporium and shares close phylogenetic afnities to P. quercinum. However, our new collection difers from P. quercinum in having larger conidia (x̄ = 18.5 × 10.3 μm versus x̄ = 16.4 × 6.8 μm) with 1–3 longitudinal septa and without a centrally located ostiole, while P. quercinum has smaller conidia with 1–2 longitudinal septa, and with a papillate ostiole. Pseudocamarosporium quercinum was discovered on dead branches of Quercus pubescens while our new collection occurred on a dead stem of Q. cerris (Wijayawardene et al. 2016). Thus, Pseudocamarosporium camporesii is proposed as a new species.

 

Figure x. Pseudocamarosporium camporesii (MFLU 16-2134, holotype). a Herbarium material, stem of Quercus cerris. b-d Appearance of black conidiomata semi-immersed to erumpent through the host. e- f Vertical section through conidioma. g Papillate ostiole. h Vertical section of conidioma wall. i-j Conidiogenous cells and developing conidia. k-p Conidia. Scale bars: b = 1000  µm, c = 500 µm, d = 200 µm, e-f = 50 µm, g-h = 25 µm, i-j = 10 µm, k-p = 5 µm.

 

References:

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 Diversity 16, 1–273.

Wijayawardene NN, Tibpromma S, Hyde KD, An YL, Camporesi E, Wang Y 2016 – Additions to Pseudocamarosporium; two new species from Italy. Studies in Fungi 1, 1–10.

 

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