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Family: CollemataceaeGenus: Lathagrium
Thallus 3-5 cm diam., foliose, ± rounded or irregular, deeply lobed, appressed. Lobes 2-6 mm wide, rather few, extended, often repeatedly branched, ± rounded with ± ascending, wavy margins, never swollen. Upper surface dark olive-green to nearly black, paler and ± transparent when moist, usually distinctly pustulate, sometimes greyish or bluish. Isidia on surface and margins, globular, often numerous and partly covering the thallus to give a scurfy appearance, concolorous with the thallus.
Anamorph: no information available.
Teleomorph: ascomata apothecia, sparse to numerous. Disc 0.5-1.5 mm diam., flat or with a ± thick thalline exciple, smooth or isidiate. Ascospores 15-24 × 6.5-13 μm, ovoid, ellipsoidal or ± globose, submuriform, often with 3 transverse and 1 longitudinal septa.