Signs
Signs of Leucostoma kunzei include the fungal stromata of its Cytospora stage which form annually in recently killed bark of cankers and more abundantly, outside of girdling cankers. Pycnidial stromata are shaped like short cones, 1-2 mm in diameter, with fertile chambers radiating from the center and opening through a common pore at the top. During moist conditions,they will produce yellow tendrils of conidia. An individual stroma however, only does this once. Conidia are unicellular, allantoid (sausage shaped), and 4-6 x 0.5-1 µm in size. Perithecial stromata which mature in spring are also short conic and 1–2 mm in diameter. The interior tissue is pale yellow to grayish brown with 5-30 black perithecia embedded within. Perithecia are 200-600 µm in diameter, and their necks converge at the disc-like top of the stroma. The disc is usually 0.2-1.0 mm in diameter and gray to black on the surface. The ascospores are hyaline (colorless), unicellular, curved, and measure 5-8 x 1-2 µm.
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