Shrieker

Giant, subterranean mushrooms that can creep around slowly.

AC7 [12], HD3 (13hp),
Att None, THACO 17 [+2],
MV 9’ (3’), SV D12 W13 P14 B15 S16 (1),
ML 12, AL Neutral, XP 35, NA 1d8 (0),

• Shriek: Triggered by light (up to 60’ away) or movement (up to 30’ away). Shriek lasts for 1d3 rounds. Each round of the shriek, there is a 50% chance of a wandering monster being attracted (will arrive in 2d6 rounds).

Source: Classic Fantasy