Helvella atra  

Anamorph: not known.
Teleomorph: apothecia stipitate-capitate, saddle-shaped or irregularly lobed, 1–4 cm broad, 3–12 cm high, cap margin adnate and attached to the stipe at 3 or 4 points; hymenium and stipe blackish with a dark violet brown tinge, even or wrinkled; hymenial surface greyish brown to black, smooth, with inconspicuous ribs on the outer surface; stipe 0.5–2.5 cm broad, naked, with 4–7 sharp-edged, partly double-edged ribs, attached to the reflexed apothecial margin, greyish brown to black, paler towards the base, ribs prominent, sharp, partly anastomosing and double-edged, with ‘holes’ (lacunae) between ribs, stipe chambered inside. Paraphyses straight, septate, subhyaline to light brown below, increasingly brown above, 3–4 μm broad, clavate to ca 6.5 μm at tips. Asci 260–10 × 14–18 μm. Ascospores 15.5–18.5 × 10–12.5 μm, ellipsoidal.

Description adapted from Skrede et al. (2017).