Pyrenacantha humblotii (Baill. ex Grandid.) Sleumer

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 : 80

Pyrenacantha humblotii (Baill. ex Grandid.) Sleumer

Fig. 26.1–26.9

Material examined

Specimen used for endocarp and fruit description

MADAGASCAR • 1987; M. Nicoll, P. Lowry & A. Rakotozafy 570; P [ MNHN-P-P00440635 ].

Other material

MADAGASCAR • s.d.; REH 334; P [ MNHN-P-P06637527 ] • s.d.; Humblot s.n.; P [ MNHN- P-P00440634 ].

Description

FRUIT. Elliptical, slightly accrescent at the apex, red when mature. Epicarp pilose-puberulent with yellow simple hairs with granular ornamentation, shriveled when dry. Mesocarp 440–560 µm thick when dry. Calyx persistent, separated from the fruit by an elongated gynophore. Length 17–22 mm, width 11–20 mm, width 5–13 mm.

ENDOCARP. Reddish-brown, elliptical in lateral view, lenticular in transverse section, length ca 17 mm, width ca 11.7 mm, thickness ca 7.4 mm. Trace of keel present in the upper part. Apex with acute protuberance, asymmetrical in lateral view; base rounded, symmetrical. Outer surface of the endocarp pitted and ridged. Pits primarily elongate, 0.4–1.3 mm in diameter, more or less randomly arranged with 9–13 pits longitudinally and 10–12 pits transversally (ca 115–130 pits per face). Pits associated with spiny tubercles protruding into the locule; tubercles ca 2–3 mm in length and 548–628 µm in diameter at the base, more or less capitate at the apex, with 16–20 cells in width. Tubercle cells sclerotic, digitate and elongate. Ridges rounded and large, delimiting a dense reticulum enclosing all pits in an areole. Endocarp wall 480–566 µm thick (excluding pits). Endocarp wall (excluding pits) with three cell layers: outermost layer with 3–4 rows of isodiametric to anticlinally oriented cells, cells 8.3–12.8 µm in length, followed by a layer with ca 13–14 rows of periclinally oriented cells, cells 16.9–56.3 µm in width; innermost layer with one row of periclinally oriented cells, cells 9.2–11.9 µm in width, lining the locule surface with regularly spaced and rounded papillae; papillae 10.5–20.0 µm (av. 15.3 µm) in diameter. Locule surface not lacunate.