Mycosphaerellales » Mycosphaerellaceae


Mycerema Bat., J.L. Bezerra & Cavalc., in Batista et al., Publicações Inst. Micol. Recife 392: 5 (1963).

 Index Fungorum number: IF 3301; Facesoffungi number: FoF 01939, 1 morphological species (Species Fungorum 2022), no molecular data available.

Epiphytic on upper surface of leaves of Vochysiacea sp. Sexual morph: Mycelium free, superficial, brown, glabrous, reticular, septate, non-hyphopodiate. Ascostromata scattered, solitary, superficial, brown, plane, orbicular, dimidiate, glabrous, membranous, lacking ostioles, with irregular dehiscence. Peridium thin-walled, poorly-developed at the base, composed of hyaline to sub hyaline, reticular, pseudoparenchymatous cells. Asci 8-spored, bitunicate, oblong to globose, sessile, apically rounded. Ascospores overlapping irregular seriate, hyaline, claviform, uniseptate, slightly constricted at the septum, smooth-walled. Asexual morph: Unknown (adapted from Batista et al. 1963).

Type species: Mycerema vochysiacearum Bat., J.L. Bezerra & Cavalc.

Notes: Mycerema is characterised by brown, plane, orbicular, dimidiate, membranous ascomata, with irregular dehiscence, hyaline to subhyaline, reticular, pseudoparenchymatous cells of the peridium, 8-spored, bitunicate, oblong to globose asci and hyaline, claviform, uniseptate ascospores (Batista et al. 1963; Phookamsak et al. 2016). Hyde et al. (2013) examined the type specimen of M. vochysiacearum and synonymized the species as Vizella vochysiacearum. Phookamsak et al. (2016) re-examined the same specimen and reported that Vizella bingervilliana was actually misidentified as Mycerema vochysiacearum and transferred M. vochysiacearum to Vizella. Phookamsak et al. (2016) hence, reinstated Mycerema and its type species, M. vochysiacearum in Schizothyriaceae. The asexual morph of Mycerema was reported as Plenotrichaius by Hyde et al (2011) and Wijayawardene et al. (2012). Mycerema is a distinct genus in Schizothyriaceae but lacks sequence data. Fresh collections with DNA sequence data are needed to confirm the systematic position of Mycerema.


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