Pyrenacantha malvifolia Engl.

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 : 87

Pyrenacantha malvifolia Engl.

Fig. 28.9–28.17

Material examined

Specimen used for endocarp and fruit description

KENYA • 16 Sep. 1961; R. M. Polhill & S. Paulo 475; BR [ BR0000016755826 ] .

Description

FRUIT. Elliptical, shortly accrescent at the apex. Epicarp strigose, with yellow simple hairs with granular ornamentation, shriveled when dry. Mesocarp 450–560 µm thick when dry. Calyx persistent. Length 16 mm, width 10.2 mm, thickness 6.5 mm.

ENDOCARP. Cream, elliptical in lateral view, lenticular in transverse section, length ca 12.6 mm, width ca 8.7 mm, thickness ca 6 mm. Keel surrounding the endocarp in the plane of symmetry. Apex acute and asymmetrical in lateral view; base rounded, symmetrical. Outer surface of the endocarp pitted and ridged. Pits circular, occasionally elongate, ca 0.3 mm in diameter, randomly arranged with 9–14 pits longitudinally and 10–12 pits transversally (ca 120–140 pits per face). Pits associated with peg-shaped tubercles protruding into the locule; tubercles ca 625–693 µm in length, 227–279 µm in diameter at the base, with ca 15–16 cells in width. Tubercle cells sclerotic, digitate and shortly elongate. Ridges faintly apparent, rounded and diffuse, with a median ridge running from the base to the apex. Endocarp wall 440–516 µm (excluding pits). Endocarp wall (excluding pits) with three cell layers: outermost layer with 2–3 rows of isodiametric to periclinally oriented cells, cells 11.5–17.0 µm in width, followed by a layer with ca 15 rows of periclinally oriented cells, cells 10.6–43.6 µm in width; innermost layer with one row of periclinally oriented cells, cells 5.7–12.3 µm in width, lining the locule surface with regularly spaced and rounded-large papillae. Locule surface not lacunate.