Pyrenacantha gossweileri (Exell) Byng & Utteridge, 2014

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 : 78

Pyrenacantha gossweileri (Exell) Byng & Utteridge

Fig. 25.19–25.27

Material examined

Specimen used for endocarp and fruit description

REPUBLIC OF THE CONGO • Mayombe , Mount Bamba; 6 Jan. 1969; Y. Attims 42; P [MNHN- P-P04494730] .

Description

FRUIT. Ovoid, accrescent at the apex, with an inflated cap that covers half of the length of the fruit. Epicarp strigose, with yellow simple hairs with granular ornamentation. Mesocarp 130–140 µm thick when dry. Calyx not persistent. Length 16.0– 16.8 mm, width 11.3–16.0 mm, thickness 7.5–12.0 mm.

ENDOCARP. Brown, ovoid to globose in lateral view, lenticular in transverse section, length ca 10.7 mm, width ca 10.5 mm, thickness ca 7.1 mm. Sharp keel surrounding the endocarp in the plane of symmetry. Apex acute, asymmetrical in lateral view; base rounded, symmetrical. Outer surface of the endocarp pitted and ridged. Pits primarily elongate, 0.5–1.7 mm in length longitudinally, randomly arranged with ca 6 pits longitudinally and 6 pits transversally (ca 33–36 pits per face). Pits associated with elongateflattened tubercles protruding into the locule; tubercles ca 724 µm in length and 716 µm in diameter at the base, with ca 15 cells in width. Tubercle cells sclerotic, digitate and not elongate. Ridges rounded and thin, with three main ridges running longitudinally. Ridges delimiting a reticulate pattern with 14–15 areoles. Secondary ridges delimiting small areoles more or less enclosing each pit. Endocarp wall 423–498 µm thick excluding ridges (ca 700 µm thick including ridges). Endocarp wall (excluding pits) with three cell layers: outermost layer with 3–4 rows of isodiametric to anticlinally oriented cells, cells 10.4–43.2 µm in length, followed by a layer with 8–12 rows of periclinally oriented cells, cells 13.0– 15.9 µm in width; innermost layer with one row of periclinally oriented cells, cells 6.3–10.3 µm in width, lining the locule surface with regularly spaced and rounded to elongate papillae; papillae 14.9–18.8 µm (av. 16.1 µm) in diameter. Locule surface not lacunate.