Botryosphaeriales » Botryosphaeriales genera incertae sedis

Metameris

Metameris Theiss. & Syd., Annls mycol. 13(3/4): 342 (1915).

 Index Fungorum number: IF 3142; Facesoffungi number: FoF 00289, 1 morphological species (Species Fungorum 2022), no molecular data available.

Saprobic or parasitic on ferns and Bougainvillea. Sexual morph: Ascostromata scattered, solitary to gregarious, erumpent through host epidermis, visible as slightly raised, black lines or black spots on the host surface. Locules clustered in pseudo stroma, uni to bi-loculate, globose to subglobose, glabrous, black, ostiole in centre of each locule, with minute papilla. Peridium thick-walled, composed of thickened, black, scleroplectenchymatous cells, arranged in a textura angularis. Hamathecium composed of numerous, filamentous, broad cellular pseudoparaphyses, anastomosing at the apex. Asci 8-spored, bitunicate, cylindrical to cylindric-clavate, subsessile to short pedicellate, apically rounded, with well-developed ocular chamber. Ascospores overlapping 1–2-seriate, 2-celled, oblong to cylindrical, narrow towards lower end cell, hyaline, septate, smoothwalled, cytoplasm stains blue in cotton blue reagent, the large guttules in the upper part of the upper cell not staining. Asexual morph: Unknown (adapted from Phookamsak et al. 2014).

Type species: Metameris japonica (Syd. & P. Syd.) Syd.

Notes: Metameris is characterised by linear pseudostromata, and hyaline, uniseptate ascospores. Clements and Shear (1931) treated Metameris under Dothideaceae (Zhang et al. 2012). Metameris was treated as a synonym of Scirrhia by Müller and Arx (1962) and placed in Mycosphaerellaceae. Later, Arx and Müller (1975) assigned Metameris to Pleosporaceae and did not accept Metameris as synonymous with Scirrhia (Crous et al. 2011, Zhang et al. 2012). Metameris was referred in Phaeosphaeriaceae based on morphology such as small ascomata, broad cylindrical to obclavate asci with a knob-like pedicel and monocotyledons host ecology (Eriksson 2006, Lumbsch & Huhndorf 2007, 2010, Crous et al. 2011, Zhang et al. 2012, Hyde et al. 2013). Phookamsak et al. (2014) excluded Metameris from Phaeosphaeriaceae. The taxonomic placement of Metameris is uncertain and is currently in Botryosphaeriales genera incertae sedis.

 

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