Pyrenacantha laetevirens Sleumer, 1940

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 : 83

Pyrenacantha laetevirens Sleumer

Fig. 27.1–27.9

Material examined

Specimen used for endocarp and fruit description

MADAGASCAR • s.d.; H. Grevé 234; P [ MNHN-P-P00440649 ].

Other material

MADAGASCAR • 1923; H. Perrier de la Bâthie 1985; P [ MNHN-P-P00440648 ].

Description

FRUIT. Elliptical, accrescent at the apex. Epicarp puberulent, with yellow simple hairs with granular ornamentation, slightly shriveled when dry. Mesocarp 313–566 µm thick when dry. Calyx persistent, occasionally separated from the fruit by an elongated gynophore. Length 19–40 mm, width 13–26 mm, thickness 7–20 mm.

ENDOCARP. Cream, elliptical in lateral view, lenticular in transverse section, length ca 18.9 mm, width ca 12.3 mm, thickness ca 8 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, 0.3–1.3 mm in length, randomly arranged with ca 10 pits longitudinally and 9–10 pits transversally (ca 108–115 pits per face). Pits associated with cylindrical tubercles protruding into the locule; tubercles ca 1979–2340 µm in length and 675–1085 µm in diameter at the base, more or less capitate at the apex, with 26 cells in width. Tubercle cells sclerotic, digitate and elongate. Ridges faintly rounded to rectangular and large, delimiting a dense reticulum enclosing all pits in an areole. Endocarp wall 370–400 µm thick excluding pits. Endocarp wall (without pits) with three cell layers: outermost layer with ca 7 rows of isodiametric to occasionally anticlinally oriented cells, cells 16.1– 33.4 µm in length, followed by a layer with ca 8 rows of periclinally oriented cells, cells 22.4–34.3 µm; innermost layer with one row of periclinally oriented cells, cells 5.0– 8.3 µm in width, lining the locule surface. Locule surface not lacunate.