Arcuatopterus

No map specified
Authors: Sheh MengLan & Shan RenHwa
Protologue: Bull. Bot. Res. 6, 4: 11
Synonyms: No synonyms
Type species: Arcuatopterus filipedicellus
Type species authors: Sheh MengLan & Shan RenHwa
Type species synonyms: No synonyms
Number of species: 6
Distribution: Asia (E: China)
Bibl.: No bibliography
No illustration specified

Features: fruits separating into mericarps; orbicular or elliptic or lanceolate; with carpophore bifid to the base; beak absent; mericarps homomorphic; glabrous; 5.5-9.0 mm long; 3.5-6.0 mm broad; strongly compressed dorsally; with primary ribs; dorsal ribs inconspicuous or dorsal ribs filiform; marginal ribs narrow-winged; mericarp ribs straight; with entire margin; calyx teeth obsolete; stylopodia low conical; styles short or styles medium; recurved; cell borders distinct or cell borders indistinct; surface foveolate-tuberculate; cells isodiametric; anticlinal walls as narrow grooves above the middle lamella; outer cell walls flat; cuticle sparse striate; exocarp cells small; commissure broad, exocarp interrupted near edges of marginal ribs; inner fibrous mesocarp obsolete; mesocarp parenchyma partly composed of cells with lignified pitted walls; vascular bundles compact; situated in primary rib bases; vittae vallecular and commissural; solitary in furrows; two on commissural side; rib sectetory ducts small, present in all ribs; endocarp not lignified; endosperm flat, slightly convex or slightly concave on commissural side; embryo with two cotyledons.

Note: СЭМ: Границы клеток местами неразличмы, и поверхность бугорчато-ямчатая (ложбинки, ребра и крылья), местами различимы, и тогда клетки изодиаметрические. В ложбинках антиклинальные стенки с узкой бороздкой, наружные стенки плоские. На крыле антиклинальные стенки выпуклые, наружные вогнутые. Кутикула в ложбинках струйчатая, на крыле гладкая или расставленно струйчатая. Встречаются устьица, вокруг них узкий слой гладкой кутикулы.