Pyrenacantha anhydathoda (Villiers) 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 : 74-76

Pyrenacantha anhydathoda (Villiers) Byng & Utteridge

Fig. 24.10–24.17

Material examined

Specimen used for endocarp and fruit description

GABON • “ Gabonia ”; s.d.; R.P. Teilles 100; P [ MNHN-P-P04494750 ] .

Other material

GABON • 19 Feb. 1902; R. P. Klaine 1571; P [MNHN-P-P00418164] .

Description

FRUIT. Ovoid to globose, accrescent at the apex, red when mature. Epicarp puberulent, with red to yellow simple hairs with granular ornamentation, ridged when dry, revealing the underlying reticulum of endocarp ridges. Mesocarp ca 100 µm thick when dry. Calyx persistent. Length 34–35 mm, width 12–20 mm, thickness 7–8 mm.

ENDOCARP. Brown, ovoid to globose in lateral view, lenticular in transverse section, length ca 10.6 mm, width ca 11.4, thickness ca 5.5 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 elongated longitudinally, 0.3–0.9 mm in length, randomly arranged with ca 5 pits longitudinally and 8 pits transversally (ca 40–42 pits per face). Pits associated with an elongate-flattened tubercles protruding into the locule; tubercles ca 412–874 µm in length and 400–450 µm in diameter at the base. Ridges rounded and thin, with a median ridge running longitudinally from the point of the apex to the center of the endocarp length and then splitting into two parts, merging with two lateral ridges. Ridges delimiting a reticulate pattern with 12–14 areoles. Secondary ridges delimiting small areoles more or less enclosing each pit. Endocarp wall 276–326 µm thick excluding ridges (ca 460 µm thick including ridges). Endocarp wall (excluding pits) with three cell layers: outermost layer with 2–4 rows of anticlinally oriented cells, cells 15.4–27.4 µm in length, followed by a layer with 14–16 rows of periclinally oriented cells, cells 8.0– 14.2 µm in width; innermost layer with one row of periclinally oriented cells, cells 7.7–15.6 µm in width, lining the locule surface with regularly spaced and rounded to elongate papillae; papillae 10.9–18.3 µm (av. 14.8 µm) in diameter. Locule surface not lacunate.