Lophodermium arundinaceum

Description
Less than 1cm: Use magnifying glass.
Fruit-body elongate, acutely spindle-shaped, breaking through a longitudinal split in the stem surface, 0.4-0.8 x 0.2-0.4 mm. Inner surface grey-brown. Outer surface black, splitting longitudinally.

Occurrence
On dead Reed stems. Summer.
Saprophyte.

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