I am not sure about H. scirpina, which has similar large fusoid spores.

Inhabitant of Carex rostrata leaves in bog.

Apothecia immersed, circular to short-ellipsoid, 140 - 250 mk, opening by ellipsoid lid (rarely by irregular patches), disc pale yellowish-brownish, surrounded more or less conspicuous brown edge.

Excipulum from textura angularis, cells with thickened walls, brown, about 10 mk in diam at base and flanks, more prismatic (10 x 5) to the edge, end row of cells (hairs) cylindrical, two-celled, to 25 x 5, tips obtuse, smooth; asci clavate, clamped, inamyloid, 58,7-66,6 x 14-17,5; paraphyses cylindrical with enlarged clavate brownish end segment, lower part segmented, about 3 mk broad, with outgrowths or branched, upper segment enlarged to 5 mk, with yellowish-brown content, rare with incrustation, exeeding the asci for about 10-15 mk, embedded in gelatinose substance; spores fosoid, some curved, some with obtuse end, many-guttulate, 25 (22,1-29) x 4,5 (3,8-4,8) (Q=5,6; N=13).