Sporocadus rosigena F. Liu, L. Cai & Crous, in Liu, Bonthond, Groenewald, Cai & Crous, Stud. Mycol. 92: 402 (2018)

Bundhun, Digvijayini, Jeewon, Rajesh, Senanayake, Indunil C., Erio Camporesi,, Aluthmuhandiram, Janith V. S., Tang, Alvin M. C., Ji-Chuan Kang,, Bhoyroo, Vishwakalyan & Hyde, Kevin D., 2021, Morpho-molecular characterization of Discosia ravennica sp. nov. and a new host record for Sporocadus rosigena, MycoKeys 79, pp. 173-192 : 173

Sporocadus rosigena F. Liu, L. Cai & Crous, in Liu, Bonthond, Groenewald, Cai & Crous, Stud. Mycol. 92: 402 (2018) Figure 3

Seimatosporium rosicola ≡ Seimatosporium rosicola Wanas., Goonas., Camporesi, & K.D. Hyde, in Wanasinghe et al., Fungal Diversity 193 (2018)

Description.

Saprobic on Quercus ilex L. Sexual morph: Illustrated in Wanasinghe et al. (2018). Asexual morph: Conidiomata (on host) 115-145 µm diam., 70-130 µm high, acervular, solitary to aggregated, semi-immersed, black; (on MEA) 50-70 µm diam., acervular, solitary to aggregated, erumpent, black. Conidiophores (on MEA) cylindrical, branched, hyaline, smooth, up to 30 µm long. Conidiogenous cells (on MEA) 7-18 × 2-3 µm (x- = 10.1 × 2.1 µm, n = 20) cylindrical, enteroblastic, annellidic, integrated or discrete, hyaline, determinate, smooth. Conidia (on MEA) 12-15 × (3-) 5-7 µm (x- = 13.5 × 5.4 µm, n = 47), obovoid, ellipsoid, broad fusiform or subcylindrical, straight or curved, hyaline when immature, pale to moderate brown at maturity, with 3 transverse, thick, darker septa, rarely constricted at the septa, often obtuse at both ends, or well rounded, smooth-walled, no appendage or sheath; basal cell obconic with a truncate base, pale brown or hyaline, thin-walled, 1-2.5 µm long (x- = 2 µm); two median cells doliiform, hyaline or pale brown, turning brown at maturity, together 5-7 µm long (x- = 6.1 µm), second cell from the base 1-3 µm long (x- = 2.5 µm), third cell from the base 1.4-4 µm long (x- = 2.6 µm); apical cell conical with obtuse or rounded apex, concolorous with the median cells, 1.8-3.5 µm long (x- = 2.5 µm).

Culture characteristics.

Colonies on MEA reaching 2-3 cm diam. after 11 days at 18 °C in darkness, filamentous, circular, flat with entire margin, white from above, reverse pale yellow.

Material examined.

ITALY. Province of Forli-Cesena , Fiumana di Predappio; on dead land leaf of Quercus ilex L. ( Fagaceae ); 20 Nov. 2017; Erio Camporesi; IT 3569 (MFLU 17-2803); living culture MFLUCC 18-0387 .

Notes.

Sporocadus rosigena from the present study shares similar morphology with the other S. rosigena strains in having almost obovoid, ellipsoid or fusiform to subcylindrical conidia ( Wanasinghe et al. 2018; Liu et al. 2019). Pairwise comparison of DNA sequence data of the isolate MFLUCC 18-0387 with the other strains of S. rosigena revealed very minor differences and thus, the strain MFLUCC 18-0387 is considered as S. rosigena .

Figures

Figure 3. Sporocadus rosigena (MFLU 17 - 2803) a Leaf of Quercus ilex L b Close-up of conidiomata on host c Upper view of colony on MEA d Conidiomata in culture (MFLUCC 18 - 0387) e, f Different stages of conidiogenesis (MFLUCC 18 - 0387) g-j Conidia (MFLUCC 18 - 0387). Scale bars: 10 μm (e, f); 5 μm (g-j).