Pleosporales » Melanommataceae

Asymmetricospora

Asymmetricospora J. Fröhl. & K.D. Hyde, Sydowia 50 (2): 183 (1998).

Index Fungorum number: IF 28247; Facesoffungi number: FoF 00758, 1 morphological species (Species Fungorum 2022), no molecular data available.

Saprobic on host. Sexual morph: Ascomata immersed, singly or in groups, appearing as black domes on the host surface, lenticular in section, uni- or usually multi-locular. Ostiole a simple central opening without tissue differentiation. Upper peridium carbonaceous, thicker at sides and apex, composed of several layers of irregular cells arranged in a textura angularis. Lower peridium composed of irregularly shaped, hyaline cells. Vertically orientated stromatal tissue separate individual locules and occur at the periphery of ascomata. Pseudoparaphyses trabeculate, persistent, numerous, tightly packed, filiform, branched and anastomosing, held within gelatinous matrix. Asci 8-spored, clavate, short pedicellate, bitunicate with an ocular chamber. Ascospores navicular to obovate, straight or curved, hyaline or lightly pigmented, unequally bicelled with a larger, rounded apical cell and a smaller, tapering, basal cell, constricted at the septum, usually with a mucilaginous sheath. Asexual morph: Unknown (adapted from Fröhlich & Hyde 1998).

Type species: Asymmetricospora calamicola J. Fröhl. & K.D. Hyde

Notes: Asymmetricospora is characterised by immersed ascomata, carbonaceous peridium, trabeculate, persistent, numerous pseudoparaphyses, 8-spored, clavate, short pedicellate asci and navicular to obovate, straight or curved, hyaline or lightly pigmented ascospores. Asymmetricospora is unique in lacking subiculum, dark setae, around the papilla, and presence of asymmetrical ascospores. The systematic position of Asymmetricospora is uncertain as molecular data is lacking. Fröhlich and Hyde (1998) maintained Asymmetricospora in Melanommataceae based on its trabeculate pseudoparaphyses. Fresh collections with DNA sequence data are needed to confirm the taxonomic placement of Asymmetricospora.

 

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