The genus was initially described by mycologist Rolf Singer in 1958 to accommodate the single species Secotium novae-zelandiae reported by Gordon Herriott Cunningham in 1924.
Weraroa contained secotioid fungi, meaning that the margin of the pileus rarely breaks free of the stipe, making them resemble somewhat a pouch on the end of a stem, or stalked-puffball.
The peridium (outer wall), which at maturity is glutinous, may range in shape from fusoid to spherical to ovoid or ellipsoid.
[1] Spores are typically from 10 to 20 μm in diameter, ellipsoid in shape, smooth, and pigmented ochre to brownish.
The basidia (usually 4-spored) often envelop their sterigmata in gastroid-like fashion (i.e., enclosed), and may be narrower in the middle with a broader base.