Icacina mannii Oliv., 2334

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 : 28

Icacina mannii Oliv.

Fig. 11.1–11.9

Material examined

Specimen used for endocarp and fruit description

REPUBLIC OF THE CONGO • Brazzaville; 1953; J. Koechlin 2334; P[ MNHN-P-P04495011 ].

Other material

GABON • 1897; R.P. Klaine 489; P[ MNHN-P-P04495007 ].

REPUBLIC OF THE CONGO • Brazzaville; 1950; J. Koechlin 633; P[ MNHN-P-P04495012 ].

Description

FRUIT. Elliptical with acute apex, laterally compressed, brown when mature. Epicarp puberulent with two types of hairs, simple hairs with granular ornamentation and small papillae-like hair expansions that line the fruit; faintly rugose when dry, revealing the underlying endocarp ridges. Mesocarp 200–400 µm thick when dry. Length 25–35 mm, width 16.5–26.0 mm, thickness 10–17 mm.

ENDOCARP. Elliptical in lateral view, lenticular in transverse section, length ca 25.6 mm, width ca 16.3 mm, thickness ca 12 mm. Keel running along the dorsal length of the endocarp, flanked by two channels, with the vascular bundle embedded within keel/ endocarp wall; a single channel runs along the ventral length of the endocarp. Apex acute, asymmetrical, forming a rectangular protuberance; base rounded-acute and slightly asymmetrical. Outer surface of the endocarp rugged with ca 90 mounds, more or less square-polygonal, with freely ending channels inside, more or less branched. Mounds organized in 9–12 longitudinal lines separated by 5–6 main longitudinal channels. The main channel on each face reaching the pore positioned subapically on the apical protuberance. Vasculature of the endocarp resting in the channels between mounds and along the channel branches inside the mounds. Endocarp wall 289–372 µm thick excluding mounds (460–544 µm including mounds). Endocarp wall with two cell layers: outermost layer with 8–9 rows of anticlinally oriented to isodiametric cells, cells 22–31 µm in length; innermost layer with 5–6 rows of periclinally oriented cells, cells 14–21 µm in width. Locule surface smooth, lacunate.