Pyrenacantha soyauxii (Engl.) Byng & Utteridge, 1469

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 : 90-92

Pyrenacantha soyauxii (Engl.) Byng & Utteridge

Fig. 29.10–29.18

Material examined

Specimen used for endocarp and fruit description

GABON • 1899; R.P. Klaine 1469; P [ MNHN-P-P04494736 ].

Description

FRUIT. Elliptical, accrescent at the apex and forming an inflated cap (representing about half of the length). Epicarp pilose, with yellow long and thin hair. Mesocarp ca 100 µm thick when dry. Calyx persistent, separated from the fruit by a short gynophore. Length 33–50 mm, width 11.2–26.0 mm, thickness 8.6–12.0 mm.

ENDOCARP. Cream, obovoid in lateral view, lenticular in transverse section, length ca 18.5 mm, width ca 10.5 mm, thickness ca 7 mm. Keel surrounding the endocarp in the plane of symmetry. Apex truncate and slightly asymmetrical, with protuberance; base rounded almost acute, symmetrical. Outer surface of the endocarp pitted and ridged. Pits primarily elongate, arranged in longitudinal lines with 10–11 pits longitudinally and 8–9 pits transversally (ca 60–70 pits per face). Pits associated with elongate-flattened tubercles protruding into the locule; tubercles 523–813 µm in length and 554–651 µm in diameter at the base, with 25–26 cells in width. Tubercle cells sclerotic, digitate and not elongate, more or less anticlinal-isodiametric. Ridges rounded, thin, delimiting a dense reticulum enclosing all pits in an areole. Endocarp wall ca 400 µm thick (excluding pits). Endocarp wall (excluding pits) with three cell layers: outermost layer with 4–6 rows of anticlinally oriented to isodiametric cells, cells 20.5–37.0 µm in length, followed by a layer with 11–13 rows of periclinally oriented cells, cells 7.1–16.2 µm in width; innermost layer with one row of periclinally oriented cells, cells 5.1–9.0 µm in width, lining the locule surface with regularly spaced and rounded papillae or inflated cells, cells 9.1–23.7 µm (av. 13.9 µm) in diameter with ca 1300 papillae/ inflated cells per 0.25 mm 2. Locule not lacunate.