AppearanceFor a key to the terms used, see :Glossary of entomology terms.
The wingspan is 22–25 mm.
Forewing uniform rufous, with an obscure dark streak from base along middle of wing; a row of outer dots on veins, sometimes hardly visible; hindwing pale, greyer towards termen; in the ab. ''lineola'' Stph the forewing is reddish grey; the veins dotted pale and dark grey; the inner and outer lines shown by rows of dots; in ''pallescens'' Tutt the red tinge is wholly absent, the forewing being whitish ochreous. •— Larva whitish,
dorsally reddish; a dark lateral line, and minute dark dots on each segment; head and plates shining brown.
The moth flies in July and August.
The larvae feed on jointed rush and other rushes. Found in damp swampy places overgrown with rushes;
often flying in the afternoon sunshine; the females are rarely taken, resting concealed in the lower parts of
the rush clumps.
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