Fissuroma Liu et al, in Liu et a l., Fungal Divers 51(1): 145 (2012)

    Saprobic on bamboo or palms appearing as domeshaped darkened areas on the host with slit-like ostioles. Sexual morph: Ascostromata dark brown to black, scattered to clustered, solitary to gregarious, immersed beneath host epidermis, becoming raised, hemisphaerical domes, uni-loculate, rarely bi-loculate joined at the base, glabrous, coriaceous or carbonaceous, ostiole a central,
slit-like opening. Peridium thin- to thick-walled, of unequal thickness, poorly developed at the base, thick at sides towards the apex, composed of dark brown pseudoparenchymatous cells, with host cells, plus fungal tissue, arranged in a textura angularis to textura epidermoidea, carbonaceous at slit-like opening. Hamathecium composed of dense , anastomosing , trabeculate pseudoparaphyses, embedded in a hyaline gelatinous matrix. Asci 8-spored, bitunicate, fissitunicate, obclavate to cylindrical, pedicellate, apically rounded, with an ocular chamber. Ascospores overlapping uni-to tri-seriate, hyaline, fusiform with narrowed ends, 1-septate, slightly constricted at the central septum, surrounded by a distinct sheath. Asexual morph: Coelomycetous, reported as pleurophomopsis-like (Tanaka and Harada 2005; Liu et al. 2011)

Type species: Fissuroma maculans (Rehm) J.K. Liu, E.B.G. Jones & K.D. Hyde.

Notes: Liu et al. (2011) introduced Fissuroma, typified by F. maculans, to accommodate some lophiostoma-like species
having hemisphaerical ascostromata with slit-like ostioles, trabeculate pseudoparaphyses and hyaline, 1-septate ascospores,
with a second species, F. aggregata (Liu et al. 2011; Hyde et al. 2013). These species had previously been placed in Astrosphaeriella and Liu et al. (2011) had found that they were not congeneric with Astrosphaeriella sensu stricto. Based on phylogenetic analyses of combined LSU and SSU sequence data, Fissuroma formed a robust clade in Aigialaceae.

Key to species of the genus Fissuroma
1. Ascostromata less than 800μm F. maculans
1. Ascostromata longer than 800μm 2
2. Ascospores with thick, distinctive sheath 3
2. Ascospores with thin sheath 4
3. Ascospores (40–)43–46(–52)×6–7(–9) μm, with spreading mucilaginous sheath surrounding the ascospores F. thailandicum
3. Ascospores (40–)45–47(–52)×6–8(–9) μm, with mucilaginous sheath in envelop surrounding the ascospores F. bambusae
4. Ascospores (43–)45–50(–55)×7–9μm, with drawn out terminal appendages F. fissuristoma
4. Ascospores without appendages 5
5. Ascospores (39–)(41–)47–50(–54) × 7–9 μm, ascostromata depressed conical, with short slit-like opening F. neoaggregata
5. Ascospores 46–61(–64)×7–9.5μm, ascostromata hemisphaerical, with long slit-like opening F. aggregata

Species

Fissuroma aggregata

Fissuroma bambusae

Fissuroma neoaggregata

Fissuroma fissuristoma

Fissuroma thailandicum