Chamaesium

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Authors: H.Wolff
Protologue: No protologue
Synonyms: No synonyms
Type species: Chamaesium paradoxum
Type species authors: H.Wolff
Type species synonyms: No synonyms
Number of species: 10
Distribution: Asia (E: China, Himalaya)
Bibl.: No bibliography
No illustration specified

Features: fruits separating into mericarps; ovate or lanceolate; with carpophore bifid to the base; beak absent; mericarps homomorphic; glabrous; 1.5-5.0 mm long; 0.8-2.0 mm broad; terete; with primary ribs; all primary ribs inconspicuous or all primary ribs equal, filiform or all primary ribs equal, keeled or all primary ribs equal, narrow-winged; mericarp ribs straight; with entire margin; calyx teeth prominent or calyx teeth obsolete; short or equal to stylopodium; lanceolate or triangular; stylopodia flat; styles short or styles medium; recurved; cell borders indistinct; surface irregularly rugate; 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; vittae vallecular and commissural; solitary in furrows or 2–5 in each furrow; two on commissural side or 4–10 on commissural side; rib sectetory ducts small, present in all ribs; endocarp not lignified; endosperm flat, slightly convex or slightly concave on commissural side or endosperm with broad, shallow groove on commissural side or endosperm with broad, deep groove on commissural side; embryo with two cotyledons.

Note: primary ribs 10, each with vascular bundle; calyx teeth, if present, joined in "corolla" СЭМ: Границы клеток неразличимы. На ребрах поверхность волнистая, кутикула морщинистая или объемная струйчато-морщинистая. В ложбинках поверхность беспорядчно морщинистая (слабые границы клеток – извилистые?), кутикула струйчатая.