Pyrenacantha tropophila Labat, El-Achkar & R.Rabev., 1746

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 : 94

Pyrenacantha tropophila Labat, El-Achkar & R.Rabev.

Fig. 30.19–30.26

Material examined

Specimen used for endocarp and fruit description

MADAGASCAR • 1904; H. Perrier de la Bâthie 1746; P [ MNHN-P-P00441092 ].

Other material

MADAGASCAR • s.d.; H. Perrier de la Bâthie 1621; P [ MNHN-P-P00440610 ].

Description

FRUIT. Elliptical to globose, accrescent at the apex, brown-orange when mature. Epicarp puberulent with yellow long and thin hairs and yellow simple hairs with granular ornamentation, shriveled when dry. Length 25–32 mm, width 17–25 mm, thickness 16–18 mm.

ENDOCARP. Brown, elliptical to ovoid in lateral view, globose in transverse section, length ca 20 mm, width ca 14.1 mm, thickness ca 12 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. Pits circular, occasionally elongate longitudinally, 0.7–1.3 mm in length, randomly arranged with 9–12 pits longitudinally and 8–10 pits transversally (ca 80–93 on each face). Pits associated with spinycylindrical tubercles protruding into the locule; tubercles 2290–2702 µm in length and 992–1264 µm in diameter at the base, capitate at the apex, with ca 33 cells in width. Tubercle cells sclerotic, digitate and elongate. Endocarp wall 374–394 µm thick (excluding pits). Endocarp wall (excluding pits) with three cell layers: outermost layer with 2–5 rows of isodiametric to periclinally oriented cells, cells 7.5– 13.0 µm in width, followed by a layer with ca 18 rows of periclinally oriented cells, cells 10.8–21.0 µm in width; innermost layer with one row of periclinally oriented cells, cells 10.7–16.5 µm in width, lining the locule surface with regularly spaced and rounded papillae; papillae 11.8–27.0 µm (av. 16.9 µm) in diameter. Locule surface not lacunate.