No map specified
Authors: Pimenov & V.N.Tikhom.
Protologue: Feddes repert.
Synonyms: No synonyms
Type species: Bilacunaria microcarpa
Type species authors: (M.Bieb.)
Type species synonyms: No synonyms
Number of species: 4
Distribution: Asia (SW, the Caucasus)
Bibl.: No bibliography
No illustration specified

Features: fruits separating into mericarps; orbicular or elliptic; with carpophore bifid to the base; beak absent; mericarps homomorphic; sparsely pubescent all over or covered by wart-like outgrowths; 2.0-8.5 mm long; 2.0-5.0 mm broad; slightly compressed dorsally; with primary ribs; all primary ribs equal, keeled; mericarp ribs straight; with entire margin; calyx teeth prominent; short or equal to stylopodium; triangular; stylopodia flat; styles medium or styles long; recurved; cell borders distinct; cells isodiametric; anticlinal walls concave; outer cell walls convex; cuticle striate with straight striae; exocarp cells small; commissure narrow, exocarp almost reaches carpophore; inner fibrous mesocarp obsolete; mesocarp parenchyma not lignified; vascular bundles compact; situated in primary rib bases; vittae cyclic; rib sectetory ducts small, present in all ribs; endocarp not lignified; crystals diffuse in mesocarp parenchyma; endosperm with mushroom-like groove on commissural side; embryo with two cotyledons.

Note: СЭМ: Границы клеток различимы, клетки изодиаметрические, антиклинальные стенки вдавленные, наружные периклинальные выпуклые, скульптура клеток струйчатая, складки кутикулы широкие, ок. 3 мкм шириной.