Ascocarps in vertical section initially subepidermal, epidermal cells becoming filled with fungal tissue as ascocarps mature. Upper wall comprising mostly black tissue with no obvious cellular structure, up to 30 µm wide, narrower towards outside edge of ascocarp. Groups of host fibre cells contained within upper wall. Lower wall 5-10 µm wide, intermixed with fibre cells of host.

Paraphyses 2 µm diam., apex undifferentiated or swelling to 2.5-3 µm. Paraphyses near edge of hymenium tightly gelled together, and not intermixed with asci. Asci 95-130 x 5.5-7.5 µm, cylindric or subclavate, tapering to small, rounded apex, wall thickened at apex, 8-spored. Ascospores 55-80 x 1-1.5 µm, 0-1 septate, with well developed gelatinous sheath.

Upper wall of pycnidia poorly developed, conidiogenous layer lining lower wall. Conidiogenous cells 9-13 x 2-2.5 µm, solitary, flask-shaped, some with wall thickened and flaring at conidiogenous locus, others with no obvious thickening and with 2 conidia held at apex. Conidia cylindric, 0 septate, hyaline, 4-4.5 x 1-1.5 µm.

CHARACTERISTICS IN CULTURE: Ascospores from PDD 43978 germinated on agar after 48 hours. On OA colonies 5 cm diam. after 10 weeks, aerial mycelium lacking, agar not discoloured, remaining sterile.

ETYMOLOGY: inclusum = enclosed, included; refers to the inclusion of some host tissue within ascocarp walls.

NOTES: PDD 45938 on Uncinia sp. is indistinguishable from L. inclusum in the appearance and dimensions of the asci, ascospores, and paraphyses. However, it has smaller (0.4-0.9 x 0.2-0.3 mm), uniformly black-walled ascocarps, lacks pycnidia, and has a less well developed upper ascocarp wall. The upper wall is similar to L. inclusum in that it lacks any kind of differentiated layer adjacent to the ascocarp opening. The differences in the ascocarp size and in the structure of the upper ascocarp wall may relate to the different host substrates. The significance of the absence of pycnidia is not known, but because of the similarities in the hymenial elements, this collection is included within L. inclusum.