Pyrenacantha puberula Boutique, 1959

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 : 87-88

Pyrenacantha puberula Boutique

Fig. 28.18–28.26

Material examined

Specimen used for endocarp and fruit description

DEMOCRATIC REPUBLIC OF THE CONGO • Botuge ; 25 Mar. 1955; C. Evrard 601; BR [ BR0000013148430 ] .

Description

FRUIT. Elliptical, acuminate and accrescent at the apex. Epicarp strigose, with yellow uncinate hairs, slightly shriveled when dry. Mesocarp 230–312 µm thick when dry. Calyx persistent, separated from the fruit by a short gynophore. Length ca 19.7 mm, width ca 11.4 mm, thickness ca 4.6 mm.

ENDOCARP. Brown, elliptical in lateral view, lenticular in transverse section, length ca 11 mm, width ca 7.2 mm, thickness ca 4.5 mm. Keel surrounding the endocarp in the plane of symmetry. Apex slightly asymmetrical and acute in lateral view; base rounded, symmetrical. Outer surface of the endocarp pitted and ridged. Pits circular, occasionally elongate, ca 0.2–0.4 mm in diameter, randomly arranged with 9–11 pits longitudinally and 8–10 pits transversally (ca 85–100 pits per face). Pits associated with spiny tubercles protruding into the locule; tubercles ca 977–1100 µm in length and 285–361 µm in diameter at the base, with ca 17 cells in width. Tubercle cells sclerotic, digitate and elongate. Ridges rounded and thin, more or less diffuse, faintly apparent, with a median ridge running longitudinally from the base to the apex. Endocarp wall 177–184 µm thick (excluding pits). Endocarp wall (excluding pits) with three cell layers: outermost layer with 1–3 rows of isodiametric to periclinally oriented cells, cells 7.5–14.6 µm in width; followed by a layer with ca 10 rows of periclinally oriented cells, cells 10.2–32.5 µm in width; innermost layer with one row of periclinally oriented cells, cells 4.1–10.0 µm, lining the locule surface with inflated to papillate cells, cells 11.2–21.8 µm (av. 17.3 µm) in diameter. Locule not lacunate.