BOZ
Creature Cataloguer
is this too choppy? 
Aversion (Sp): An ustilagor can psionically create a compulsion effect targeting one creature within 30 feet. The target must succeed on a DC 22 Will save or gain an aversion to fungi for X minutes. Affected creatures must stay at least 20 feet from any fungi (including fungi covering an ustilagor), alive or dead; if already within 20 feet, they move away. A subject unable to move away, or one attacked by fungi or ustilagor, is overcome with revulsion. This revulsion reduces the creature's Dexterity score by 4 points until the effect wears off or the subject is no longer within 20 feet of fungi. This ability is otherwise similar to antipathy as the spell (caster level Xth). The save DC is Charisma-based.
And here’s a start on rewriting the other power I’d want to keep if there are no simple psionics-spells conversions (and I kept it more in tune with the original ustilagor description rather than the ExPsiHB power):
“Telempathic Projection” (Sp): An ustilagor can psionically alter a target’s mood, affecting one creature within 30 feet. The target must succeed on a DC X Will or the ustilagor can adjust the creature’s attitude towards the ustilagor or another creature by one step in either a positive or negative direction. This effect is cumulative if used more than once on the same creature (duration ?). This is a mind-affecting charm effect. The save DC is Charisma-based.

Aversion (Sp): An ustilagor can psionically create a compulsion effect targeting one creature within 30 feet. The target must succeed on a DC 22 Will save or gain an aversion to fungi for X minutes. Affected creatures must stay at least 20 feet from any fungi (including fungi covering an ustilagor), alive or dead; if already within 20 feet, they move away. A subject unable to move away, or one attacked by fungi or ustilagor, is overcome with revulsion. This revulsion reduces the creature's Dexterity score by 4 points until the effect wears off or the subject is no longer within 20 feet of fungi. This ability is otherwise similar to antipathy as the spell (caster level Xth). The save DC is Charisma-based.
And here’s a start on rewriting the other power I’d want to keep if there are no simple psionics-spells conversions (and I kept it more in tune with the original ustilagor description rather than the ExPsiHB power):
“Telempathic Projection” (Sp): An ustilagor can psionically alter a target’s mood, affecting one creature within 30 feet. The target must succeed on a DC X Will or the ustilagor can adjust the creature’s attitude towards the ustilagor or another creature by one step in either a positive or negative direction. This effect is cumulative if used more than once on the same creature (duration ?). This is a mind-affecting charm effect. The save DC is Charisma-based.