Capnodiales » Schizothyriaceae

Vonarxella

Vonarxella Bat., J.L. Bezerra & Peres, Riv. Patol. veg., Pavia, sér. 4 1(1-2): 61 (1965).

Index Fungorum number: IF 5753; Facesoffungi number: FoF 04673, 1 morphological species (Species Fungorum 2022), no molecular data available.

Epiphytic on the lower surface of leaves. Mycelium not observed. Sexual morph: Ascostromata superficial, solitary, black, flattened, circular, easily removed from the host surface, multi-loculate, hemispherical, lacking ostioles, upper wall composed of meandering cells, arranged and branching from the central to the outer rim. Peridium thin-walled, composed of dark brown to black pseudoparenchymatous cells, arranged in a textura angularis, comprising irregular meandering arrangement of dark brown, compact cells, poorly-developed at the base. Hamathecium comprising numerous, septate, hypha-like pseudoparaphyses, embedded in a gelatinous matrix. Asci 8-spored or more, bitunicate, fissitunicate, cylindro-clavate to clavate, with an ocular chamber, with or without pedicel, asci arising from the base of the ascomata. Ascospores overlapping 3–4seriate, hyaline, obovoid to ellipsoidal, uniseptate, apical cell wider and shorter than lower cell, lower cell narrows and tapering to rounded base. Asexual morph: Unknown (adapted from Doilom et al. 2018).

 Type species: Vonarxella dipterygis Bat., J.L. Bezerra & Peres

Notes: Vonarxella is characterised by superficial, solitary, black, flattened ascostromata, thin-walled peridium, cylindro-clavate to clavate asci and obovoid to ellipsoidal, uniseptate ascospores. Batista et al. (1965) placed Vonarxella in Schizothyriaceae while Arx and Müller (1975) transferred the genus to Saccardiaceae. Phookamsak et al. (2016) placed Vonarxella in Schizothyriaceae based on morphology, namely ascostromata that are flattened, multi-loculate, a peridium consisting of dark brown, compact cells of textura angularis, and ascospores that are uniseptate, hyaline, slightly constricted at the septum, and wider in upper cell. Doilom et al. (2018) studied the type specimen of V. dipterygis and followed the taxonomic treatment of Phookamsak et al. (2016). Vonarxella is currently a distinct genus in Schizothyriaceae but DNA sequence data is needed to confirm this taxonomic placement.

 

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