Pleosporales » Amorosiaceae


Angustimassarina Thambug., Kaz. Tanaka & K.D. Hyde, in Thambugala et al., Fungal Diversity 74:199–266 (2015)

Indexfungorum number: IF 551278; Facesoffungi number: FoF 01085

Etymology: angustus (arrow) + Massarina, referring to narrowly fusiform ascospores

            Fungicolous or saprobic on other fungi or dead wood in terrestrial habitats. Sexual morph: Ascomata solitary or gregarious, immersed to semi-immersed, becoming erumpent, coriaceous, dark brown to black, globose to subglobose, uniloculate, ostiolate. Ostiole central, cylindrical, papillate, and composed of pseudoparenchymatous cells, broad, well-developed, with a pore-like opening or through the cracks of host surface. Peridium composed of several layers of dark brown to lightly pigmented cells of textura angularis, fusing at the outside with the host ascomata. Hamathecium comprising 1–2.5μm wide, septate, unbranched, cellular, pseudoparaphyses, embedded in a gelatinous matrix. Asci 8-spored, bitunicate, fissitunicate, cylindrical to cylindric-clavate, short pedicellate, rounded at the apex, with an ocular chamber.

Ascospores uni to tri-seriate, partially overlapping, hyaline, becoming ocher brown at maturity, fusiform to cylindrical or ellipsoidal-fusiform, mostly straight, widest at the centre and tapering toward the ends, 1(–3)-septate, constricted at the central septum, smooth-walled, verruculose at maturity, filled with a different sized guttule per cell and surrounded by a mucilaginous sheath. Asexual morph: hyphomycetous. Conidiophores micronematous to semimacronematous, arising singly and not in sporodochia or synemmata, pale brown, unbranched, similar to the mycelial hypha. Conidiogenous cells integrated, terminal, holoblastic, short-cylindrical to elongate-cylindrical, brown to pale brown, smooth-walled. Conidia solitary, dry, elongateclavate, pale to dark brown, 1–3-septate, evenly pigmented, constricted at the septa, smooth-walled.

Type species: Angustimassarina populi Thambug. & K.D. Hyde, in Thambugala et al., Fungal Diversity 74:199–266 (2015)

Notes: We introduce Angustimassarina to accommodate three new ascomycetous species from Italy and Germany. Phylogenetically, the Angustimassarina clade clustered as a sister clade to the Amorosia clade in Amorosiaceae. Species of Angustimassarina are considered as fungicolous. They may be parasitic on other fungi and appear to grow within other ascomata of other ascomycetes. The Angustimassarina clade formed a distinctly separate sister clade to the Amorosia clade with high ML and BYPP support.



Thambugala KM, Hyde KD, Tanaka K, Tian Q et al. 2015 – Towards a natural classification and backbone tree for Lophiostomataceae, Floricolaceae, and Amorosiaceae fam. nov. Fungal Diversity 74, 199–266.


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