Stachyanthus zenkeri Engl.

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 : 109

Stachyanthus zenkeri Engl.

Fig. 34.19–34.27

Material examined

Specimen used for endocarp and fruit description

EQUATORIAL GUINEA • Bioko ; 26 Sep. 1988; Carvalho 3626; P [MNHN-P-P05030978] .

Description

FRUIT. Acute at the apex. Epicarp strigose, with yellow uncinate hairs, ridged when dry, revealing the underlying endocarp ridges. Mesocarp 204–264 µm thick when dry. Length 24–30 mm, width 14– 18 mm, thickness 9–12 mm.

ENDOCARP. Brown, length ca 22.3 mm, width ca 13.8 mm, thickness ca 8.8 mm. Pits exclusively circular, 0.2–0.3 mm in diameter, more or less organized in longitudinal lines with 14–18 pits longitudinally and 9–10 pits transversally (ca 162–164 pits per face). Pits associated with bullate tubercles protruding into the locule; tubercles ca 320 µm in length and ca 701 µm in diameter at the base. Tubercle cells sclerotic, digitate and periclinal. Ridges sharp and thin, with three longitudinal ridges; the median ridge running from the base to the apex, the two lateral ridges running subbasally up to the top third of the endocarp length, where they merge with the median ridge. Endocarp wall 277–477 µm thick excluding ridges (800–960 µm thick including ridges). Endocarp wall with three cell layers: outermost layer with 3–4 rows of isodiametric to anticlinally (mesocarp?) oriented cells, cells 13.5–19.2 µm in width, followed by a layer with 11–12 rows of periclinally oriented cells, cells 18.0– 21.4 µm in width; innermost layer with one row of periclinally oriented cells, cells 6.3–10.0 µm in width, lining the locule surface.