Acrodiclidium meissneri Mez, Jahrb. Bot. Gart. Berlin 5: 98. 1889.
Acrodiclidium guyanense var. 7 caudatum Meissner in DC. Prodr. 15: 85. 1864.
Type. Prope San Carlos, ad Rio Negro, Brasiliae borealis, 1853-54, Spruce 3058 (isotype, y. fr. NY).
The above collections bear mature fruit, ellipsoid, obtuse at both ends, more than 2 cm long and 1.3 cm broad, enclosed barely one-quarter their entire length in rugulose, cyathiform cupules 12 mm long and 16 mm in diameter and about 7 mm deep, slightly flaring at the finely double margin, and covered with small, pale tan warts, abruptly constricted at the base and seated on slightly enlarged pedicels about 3 mm long and 1 mm or less in width.
The species is recognized by the smallish (8-12 cm long), elliptic, longacuminate leaves, dark brown above, in the dried state, and paler beneath. They are not, however, opposite, as has been reported, but sometimes subopposite towards the tip of the branchlets, as noted by Mez.