🇺🇸 Diatrype undulata - 🇩🇪 Flaches Birkeneckenscheibchen - 🇷🇺 Диатрипе волнистая

🇺🇸 Diatrype undulata - 🇩🇪 Flaches Birkeneckenscheibchen - 🇷🇺 Диатрипе волнистая 9/27/25

🆔 Diatrype undulata (Pers.) Fr.
ℹ️ Fruit body: Thin, flat to slightly raised carbonaceous stromata forming crust-like patches on bark of dead branches, stromata are blackish, with a whitish entostromal layer underneath
ℹ️ Perithecia: Perithecia immersed to erumpent, arranged singly, often with black sulcate ostioles visible on surface of stromata
⚪ Spores dispersed from perithecia
🍂🪵 Parasite, pathogen, saprobe on birch (monophagous on Betula spp.) branches, especially dead or dying bark
❌ Inedible, microscopic
📏 Dimensions: Stromatal patches can cover branch surfaces; perithecia ostioles about 5–7 µm wide by 75–95 µm long in stalk length
📐 Crust width: Extent variable depending on branch area
🔬 Microscopic features - Asci: Long-stalked, 8-spored. Ascospores: Allantoid, pale olivaceous, ~ 5–8 × ~1 µm
🔤 Appears as thin, blackish crusts on dead birch branches. The fruiting bodies (perithecia) are embedded in stromata, with visible, often sulcate, black ostioles