Pleosporales » Phaeosphaeriaceae


Amarenomyces O.E. Erikss., Op. bot. 60: 124 (1981).

 Index Fungorum number: IF 151; Facesoffungi number: FoF 00235, 2 morphological species (Species Fungorum 2022), 2 species with molecular data.

Saprobic on Ammophila. Sexual morph: Ascomata scattered, immersed to erumpent through host tissue, visible as small black spots on host surface, uniloculate, globose to subglobose, glabrous, dark brown, ostiole central, with short papilla. Peridium thin-walled, of equal thickness, composed of 3–5 layers of flattened, dark brown, pseudoparenchymatous cells, arranged in textura angularis to textura prismatica. Hamathecium composed of numerous, 1.5–3μm wide, filiform, distinctly septate, frequently anastomosing, narrow cellular pseudoparaphyses, embedded in mucilaginous matrix. Asci 8-spored, bitunicate, fissitunicate, broadly cylindrical, subsessile with minute knob-like pedicel, apically rounded, with a well-developed ocular chamber. Ascospores overlapping 1–3-seriate, phragmosporous, broadly fusiform, rarely cylindric-clavate, widest at the middle cell, pale yellowish when immature, becoming yellowish-brown to brown at maturity, 6-septate, slightly constrict at the septum, smooth and thick-walled. Asexual morph: Unknown (adapted from Phookamsak et al. 2014).

Type species: Amarenomyces ammophilae (Lasch) O.E. Erikss.

Notes: Amarenomyces ammophilae was previously known as Sphaeria ammophilae and was found from marine grass. Amarenomyces is unique in having multi-layered endotunica and large, thick-walled and sheathed ascospores. Eriksson (1981) suggested placement of Amarenomyces in Botryosphaeriaceae based on morphology. Zhang et al. (2009) referred Amarenomyces as a synonym of Phaeosphaeria based on phylogenetic analyses. In the phylogenetic studies of Zhang et al. (2009, 2012) and Hyde et al. (2013), the generic type, A. ammophilae clustered with other Phaeosphaeria species. Phookamsak et al. (2014) reinstated Amarenomyces based on the phylogenetic evidence as A. ammophilae forms a separate clade to the type species of Phaeosphaeria, P. oryzae. Even though, A. ammophilae has frequently been reported to be the sexual state of Amarenographium metableticum, Phookamsak et al. (2014) did not treat them as congeneric and suggested that this relationship can be erroneous as both species were found on the same host. Amarenomyces is currently a distinct genus in Phaeosphaeriaceae. Molecular markers available for Amarenomyces are ITS, SSU, LSU and TEF-1.


About Dothideomycetes

The website provides an up-to-date classification and account of all genera of the class Dothideomycetes.

Mushroom Research Foundation


Published by the Mushroom Research Foundation 
Copyright © The copyright belongs to the Mushroom Research Foundation. All Rights Reserved.