Pyrenacantha longirostrata Villiers, 1972

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 : 86-87

Pyrenacantha longirostrata Villiers

Fig. 27.19–27.25

Material examined

Specimen used for endocarp and fruit description

CAMEROON • “ Cameroun ”; s.d.; R. Letouzey 14156; K.

Description

FRUIT. Elliptical, accrescent at the apex, red when mature. Epicarp strigose, with yellow uncinate hairs. Length 28–35 mm, width 16–20 mm, thickness 6–8 mm.

ENDOCARP. Brown, elliptical in lateral view, lenticular in transverse section, width ca 15 mm, thickness ca 6 mm. Keel surrounding the endocarp in the plane of symmetry.Apex slightly asymmetrical and acute in lateral view. Outer surface of the endocarp pitted and ridged. Pits circular, occasionally elongate, 0.1–0.3 mm in diameter, randomly arranged with 11–12 pits transversally. Pits associated with spiny tubercles protruding into the locule; tubercles ca 1200 µm in length and ca 386–472 µm in diameter at the base, apex occasionally bifid, with ca 14 cells in width. Tubercle cells sclerotic, digitate and elongate. Ridges rounded and thin, diffuse, faintly apparent. Endocarp wall 350–400 µm thick excluding ridges (484–534 µm thick including ridges). Endocarp wall (excluding pits and ridges) with two cell layers: outermost layer with ca 11 rows of periclinally oriented cells, cells 11.2–32.8 µm in width; innermost layer with one row of periclinally oriented cells, cells 9.8–16.2 µm in width, lining the locule surface with regularly spaced and rounded papillae; papillae 8.7–15.7 µm (av. 13.7 µm) in diameter, ca 190 papillae per 0.25 mm 2. Locule surface not lacunate.

Remarks

Endocarp specimen with only the upper part preserved; fruits rare in herbarium collections.

Pyrenacantha macrocarpa (A.Chev. ex Hutch. & Dalziel) Byng & Utteridge Fig. 28.1–28.8

Material examined

Specimens used for endocarp and fruit description

IVORY COAST • Abidjan; s.d.; J. de Koning 4918; BR [ BR0000015570635 ] • 1954; N. Lovi 3952; P [ MNHN-P-P04494747 ].

Other material

IVORY COAST • 1907; A. Chevalier 17216; P [ MNHN-P-P00418166 ].

GHANA • 1999; J. Stone, J. Amponsah & M. Chintoh 3421; P [ MNHN-P-P06807826 ].

Description

FRUIT. Elliptical, accrescent at the apex and forming an inflated cap (representing about half of the length). Epicarp pilose, with long and thin hairs and yellow-white simple hairs with granular ornamentation. Mesocarp thin when dry. Calyx persistent, separated from the fruit by a more or less elongated gynophore. Length 42.4–70.0 mm, width 20–25 mm, thickness 9–10 mm.

ENDOCARP. Cream, deltoid in lateral view, lenticular in transverse section, length ca 20.6 mm, width ca 16.4 mm, thickness ca 9.5 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 circular, occasionally elongate, 0.5–1.6 mm in diameter, arranged in longitudinal lines with 9–10 pits longitudinally and 8–9 pits transversally (ca 83–84 pits per face). Pits associated with elongate-flattened tubercles protruding into the locule; tubercles ca 710–1084 µm in length and 227–279 µm in diameter at the base. Ridges rounded-rectangular, thin, delimiting a dense reticulum enclosing all pits in an areole. Endocarp wall 534 µm thick excluding pits. Endocarp wall (excluding pits) with three cell layers poorly preserved except for the innermost layer including one row of periclinally oriented cells, cells 3.3–10.5 µm in width, lining the locule surface with inflated cells. Locule surface not lacunate.

Remarks

Endocarp wall poorly preserved in the specimens examined due to the preparation (see Discussion for preservation issues).