Leucostoma key
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1 |
Stromata developing in bark of conifers |
2 |
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Stromata developing in bark of broadleaved trees |
3 |
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2 |
Ectostromatic disc 500-700 µm diam., white to pale brownish, sometimes obliterated by the emerging perithecial necks; ascospores (7-) 12-14 (-21) x (1.5-) 2.5-3 (-4) µm |
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Ectostromatic disc 500-700 µm diam., dark greyish-brown; ascospores 5-7 x ca 1.5 µm |
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3 |
Ectostromatic pure white |
4 |
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Ectostromatic disc pale yellow, grey or brown; in bark of rosaceous trees |
5 |
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4 |
Ectostromatic disc 300-350 µm diam.; ascospores 12.5-17 x 2.5-3 µm in 4-spored asci, 10-15 x 2.5-3 µm in 8-spored asci; in bark of Populus and Salix spp. |
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Ectostromatic disc 400-500 µm diam.; ascospores (7.5-) 10-13 (-18) x (1.5-) 2-2.5 (-4) µm, all in 8-spored asci; in bark of Prunus, ? sometimes in other rosaceous trees |
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5 |
Ectostromatic disc dark grey-brown when mature; ascospores 10-18 (-25) x 3-4µm; in bark of Sorbus |
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Ectostromatic disc pale yellowish or grey; ascospores (8-) 13-20 (-30) x (2-) 3-5 µm; in bark of Prunus |