Phycomid (CR 3)

Small Plant
Alignment: Always neutral
Initiative: +3; Senses: blindsight 30 ft. and tremorsense 60 ft.

AC: 16 (+1 size, +3 natural), touch 14, flat-footed 13
Hit Dice: 3d8+15 (28 hp)
Fort +8, Ref +4, Will +1
Speed: 10 ft.
Space: 5 ft./5 ft.
Base Attack +2; Grapple -2
Attack: Acid globules +6 ranged touch
Full Attack: 2 acid globules +6 ranged touch
Damage: Acid globules 1d4 acid
Special Attacks/Actions: Acid, infestation
Abilities: Str 10, Dex 17, Con 20, Int -, Wis 11, Cha 10
Special Qualities: Acid immunity, fire resistance 10, immunities, plant traits
Advancement: 4-6 HD (Medium), 7-9 HD (Large)
Climate/Terrain: Any underground
Organization: Solitary or swath (2-8)
Treasure: None

Source: Dragon #337

This creature resembles a fibrous blob of decomposing milky-colored matter with capped fungi growing out of it. Extruding from this mess are several thin stalks that look almost like hoses. Tangled in amongst the mess it grows in are several humanoid bones.

The phycomid is an aggressive fungoid predator that dwells in underground regions. These creatures are constantly on the move, slowly slithering over cave floors in search of new prey. Often, their mass is tangled hopelessly around the bones of their previous victims. They prefer to dwell in moist, wet environments but if hungry won't hesitate to strike out into drier surrounding caverns.

A phycomid is roughly 2 feet in diameter but can be larger, especially if its mass incorporates a lot of bones) and commonly weighs about 50 pounds.