Pyrenacantha sylvestris S.Moore, 1920

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 : 92-93

Pyrenacantha sylvestris S.Moore

Fig. 30.1–30.9

Material examined

Specimen used for endocarp and fruit description

GABON • 1964; N. Hallé 3598; P [ MNHN-P-P04472269 ].

Other material

GABON • 1979; J. Florence 2002; P [ MNHN-P-P04472191 ].

Description

FRUIT. Elliptical, acuminate and accrescent at the apex, brown when mature. Epicarp puberulent, with yellow simple hairs with granular ornamentation and yellow-red uncinate hairs, shriveled when dry, revealing the underlying reticulum of endocarp ridges. Mesocarp 170–300 µm thick when dry. Calyx persistent. Length 10.2–12.0 mm, width 8.5–12.0 mm, thickness 3.5–5.6 mm.

ENDOCARP. Brown, elliptical in lateral view, lenticular in transverse section, length ca 9 mm, width ca 7.4 mm, thickness ca 5 mm. Sharp 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 elongate and thin, ca 0.1–0.5 mm in length, randomly arranged with 6–7 pits longitudinally and 5–8 pits transversally (ca 44–54 pits per face). Pits associated with cylindrical tubercles protruding into the locule; tubercles ca 1307–1549 µm in length and 488–604 µm in diameter at the base, capitate or bifid at the apex, with ca 28 cells in width. Tubercle cells sclerotic, digitate and elongate. Ridges rounded and thin, more or less diffuse, faintly apparent, with a median ridge running longitudinally from the base up to the apex. Endocarp wall 189–228 µm thick (excluding pits). Endocarp wall (excluding pits) with three cell layers: outermost layer with 2–3 rows of anticlinally oriented to isodiametric cells, cells 11.8–18.5 µm in length, followed by a layer with 9–10 rows of periclinally oriented thick cells, cells 13.1–17.9 µm in width; innermost layer with one row of periclinally oriented cells, cells 8.4–14.7 µm in width, lining the locule surface with inflated to papillate cells. Locule not lacunate.