Pyrenacantha capitata H.Perrier, 1944

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 : 76

Pyrenacantha capitata H.Perrier

Fig. 24.18–24.26

Material examined

Specimen used for endocarp and fruit description

MADAGASCAR • 2002; F. Ratovoson et al. 678; P [ MNHN-P-P00440639 ].

Other material

MADAGASCAR • 2005; T. Andriamihajarivo et al. 638; P [ MNHN-P-P06807829 ].

Description

FRUIT. Elliptical, slightly accrescent at the apex. Epicarp pilose with yellow long and thin hairs, shriveled when dry. Mesocarp 360–400 µm thick when dry. Calyx persistent. Length 17–21 mm, width 8–12 mm, thickness 4–6 mm.

ENDOCARP. Cream, elliptical in lateral view, lenticular in transverse section, length ca 17.1 mm, width ca 10.4 mm, thickness ca 4.5 mm. Trace of keel present in the upper part. Apex with acute protuberance but flattened laterally, asymmetrical in lateral view; base rounded, symmetrical. Outer surface of the endocarp pitted and ridged with only 1–2 longitudinal ridges present in the flattened apical part. Pits circular, occasionally elongate, 0.2–0.6 mm in diameter, more or less randomly arranged with 10–13 pits longitudinally and 8–10 pits transversally (ca 107–114 pits per face). Pits associated with spiny tubercles protruding into the locule; tubercles ca 1500 µm in length and 420–620 µm in diameter at the base, with 20–23 cells in width. Tubercle cells sclerotic, digitate and elongate. Endocarp wall 246–289 µm thick (excluding pits). Endocarp wall (excluding pits), with three cell layers: outermost layer with 4–7 rows of anticlinally oriented to isodiametric cells, cells 15.4–28.9 µm in length, followed by a layer with 9–12 rows of periclinally oriented cells, cells 10.0– 11.2 µm in width; innermost layer with one row of periclinally oriented cells, cells 5.0– 9.9 µm in width, lining the locule surface with more or less flattened cells. Locule surface not lacunate.