Pyrenacantha staudtii (Engl.) Engl., 1737

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

Pyrenacantha staudtii (Engl.) Engl.

Fig. 29.19–29.27

Material examined

Specimen used for endocarp and fruit description

CENTRAL AFRICAN REPUBLIC • Boukoko ; 10 May 1950; R. P. Tisserant 1737; P [MNHN- P-P04472207] .

Other material

CAMEROON • 1982; J.N. Asonganyi 448; P [ MNHN-P-P05279462 ] • 1962; F.J. Breteler 2968; WAG [ WAG.1399253 ].

Description

FRUIT. Obovoid, slightly accrescent at the apex. Epicarp puberulent, with yellow simple hairs with granular ornamentation, shriveled when dry. Mesocarp 350–410 µm thick when dry. Calyx persistent. Length 12–20 mm, width 10–12 mm, thickness 7–9 mm.

ENDOCARP. Brown, elliptical to obovoid in lateral view, lenticular in transverse section, length ca 10.8 mm, width ca 9 mm, thickness ca 6.7 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, arranged in longitudinal lines with 5–7 pits longitudinally and 7–8 pits transversally (ca 38–43 pits per face). Pits associated with cylindrical tubercles protruding into the locule; tubercles ca 1.8 mm in length and 0.6 mm in diameter at the base, capitate at the apex, with ca 30 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 244–295 µm thick (excluding pits). Endocarp wall (excluding pits) with two cell layers: outermost layer with 12 rows of periclinally oriented cells, cells 14.7–21.8 µm in width; innermost layer with one row of periclinally oriented cells, cells 7.3–9.0 µm in width, lining the locule surface. Locule not lacunate.