Pyrenacantha lebrunii Boutique, 1959

Rio, Cédric Del, Stull, Gregory W. & Franceschi, Dario De, 2020, Survey of the fruits and endocarps of Icacinaceae (Lamiids, Icacinales), European Journal of Taxonomy 645, pp. 1-130 : 84

Pyrenacantha lebrunii Boutique

Fig. 27.10–27.18

Material examined

Other material

CAMEROON • 1962; F.J. Breteler 2933; P [ MNHN-P-P04472184 ].

Description

FRUIT. Elliptical, acuminate and accrescent at the apex. Epicarp puberulent, with yellow simple hairs with granular ornamentation, shriveled when dry, revealing the underlying reticulum of endocarp ridges. Mesocarp 130–300 µm thick when dry. Calyx persistent, separated from the fruit by a short gynophore. Length 16.0– 18.4 mm, width 9.6–11.0 mm, thickness 3–5 mm.

ENDOCARP. Brown, elliptical in lateral view, lenticular in transverse section, length ca 13.9 mm, width ca 8.8 mm, thickness ca 4.1 mm. Keel surrounding the endocarp in the plane of symmetry. Apex slightly asymmetrical and acute in lateral view; base rounded, symmetrical. Outer surface of the endocarp pitted and ridged. Pits circular, occasionally elongate, 0.2–0.3 mm in diameter, randomly arranged with 9–11 pits longitudinally and ca 8 pits transversally (ca 105–107 pits per face). Pits associated with spiny tubercles protruding into the locule; tubercles ca 836–1500 µm in length and ca 500 µm in diameter at the base, with ca 22 cells in width. Tubercle cells sclerotic, digitate and elongate. Ridges rounded and thin, more or less diffuse, enclosing 4–5 areoles, faintly apparent, with a ridge running longitudinally from the base up to the apex. Endocarp wall 221–280 µm thick excluding ridges (370–455 µm including ridges). Endocarp wall (excluding pits) with three cell layers: outermost layer with ca 2 rows of isodiametric cells, cells 11.3–22.2 µm in diameter, followed by a layer with ca 11 rows of periclinally oriented cells, cells 16.3–33.2 µm in width; innermost layer with one row of periclinally oriented cells, cells 7.5–15.5 µm in width, lining the locule surface with more or less inflated, papillate cells. Locule surface not lacunate.