Septoriella camporesii
Septoriella camporesii Goonas. & Hyde, in Hyde et al., Fungal Diversity 100: 108 (2020)
Index Fungorum number: IF556918; Facesofungi number: FoF 06804
Etymology: Named in honour of the collector Erio Camporesi.
Holotype: MFLU 15–1259
Saprobic on dead leaf of Anthoxanthum odoratum, appearing as black ellipsoidal, raised spots on the host surface. Sexual morph: Undetermined. Asexual morph: Coelomycetous. Conidiomata 95–120 μm wide, 80–95 μm high, dark brown to black, pycnidial, solitary to gregarious or scattered, semi-immersed to erumpent, globose, unilocular, glabrous. Pycnidial walls 10–20 μm wide, in the upper and lateral parts, composed of outer dark brown and inner light brown to hyaline cells of textura prismatica, at the base, pale brown to hyaline cells of textura prismatica gradually merging with host tissue. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 2 × 3 μm, hyaline, phialidic, doliiform, discrete, determinate, smooth, arising from the inner layers of conidioma. Conidia 15.3–19.2 × 2.7–3.5 μm (x̄ = 17 × 3.2 μm, n = 30), hyaline when immature, becoming light brown to pale greenish-brown, oblong to subcylindrical, rounded at apex, slightly truncate at base, 1–3-septate at maturity, septa less conspicuous in immature spores, smooth-walled, greenish specks-like globules present in the cell matrix.
Culture Characteristics: Colonies showing moderate growth, circular, reaching 40 mm diam. in 4 weeks at 18–20 °C on PDA, medium dense and woolly, dull surface, convex, margins entire, from above white at the centre, becoming grey at the margins, reverse gray.
Material examined: ITALY, Province of Forlì-Cesena [FC], near Camposonaldo-Santa Sofia, on dead leaf of Anthoxanthum odoratum L. (Poaceae), 17 September 2012, E. Camporesi, IT 724 (MFLU 15–1259, holotype; KUN-HKAS 96289, isotype), ex-type living culture, KUMCC 16–0113.
GenBank Numbers: ITS: MN648204; LSU: MN648201; SSU: MN648202.
Note: Septoriella camporesii shares similar characteristics with other Septoriella species in having fusiform to subcylindrical pale brown, euseptate conidia with rounded ends. However, the conidia in S. camporesii lack distinct mucoid appendages at both ends, which distinguishes it from other species. It is most similar to S. subcylindrospora (W.J. Li et al.) Y. Marín & Crous in having smooth-walled, subcylindrical conidia with a truncate base, but the conidiomata of S. camporesii are semi-immersed to erumpent while in S. subcylindrospora are immersed to semi-immersed. In our phylogeny, S. camporesii groups within the clade represented by the type Septoriella phragmitis (ex-epitype strain CPC 24118). The new species has a close relationship with Loratospora luzulae Jayasiri, Camporesi & K.D. Hyde (MFLUCC 14–0826) and Septoriella germanica Crous, R.K. Schumach. & Y. Marín (CBS 145372), but with low bootstrap support (62% ML, 0.90 BYPP). Loratospora luzulae needs to be revisited in future study.
Figure x. Septoriella camporesii (MFLU 15–1259, holotype). a Appearance of conidiomata on the host surface. b Close up of conidiomata. c–d Section through conidiomata. e Pycnidial wall. f Conidia arising from conidiogenous cells. g–n Conidia. o–p Colony characteristics from above (o) and below (p). Scale bars: c–f = 50 μm, d–e, g–o = 20 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.