Rhyticaryum longifolium K.Schum. & Lauterb.

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 : 99

Rhyticaryum longifolium K.Schum. & Lauterb.

Fig. 32.1–32.9

Material examined

Specimen used for endocarp and fruit description

PAPUA NEW GUINEA • 21 Nov. 1973; Jacobs 9671; L [ L.229211] • 1962; Bowers 84; L [ L.2292735] .

Other material

PAPUA NEW GUINEA • 1996; W. Takeuchi & J. Kulang 11657; P [ MNHN-P-P05279704 ].

Description

FRUIT. Epicarp strigose, with red simple hairs with granular ornamentation. Mesocarp 110–130 µm thick when dry. Length 18.2–25.0 mm, width 11.4–17.0 mm, thickness 7.6–10.0 mm.

ENDOCARP. Cream, length 16.8–17.0 mm, width 10.7–11.9 mm, thickness 7.6–8.1 mm. Keel surrounding the endocarp in the plane of symmetry. Apex truncate, slightly inflated and asymmetrical in lateral view; base rounded, symmetrical. Outer surface of the endocarp ridged, with ca five longitudinal ridges; the median ridge reaching the point of the base. Ridges sharp to slightly rounded and thin, with a median channel, enclosing 7–11 polygonal areoles with small freely ending ridgelets. Primary vascular bundle positioned outside the endocarp wall. Endocarp wall 312–445 µm thick excluding ridges (740–840 µm thick including ridges). Endocarp wall with three cell layers: outermost layer with 2–3 rows of anticlinally oriented cells, cells 14.1–20.5 µm in length, followed by a layer with ca13 rows of periclinally oriented cells, cells 15.6–40.3 µm in width; innermost layer with one row of periclinally oriented cells, cells 10.1–17.4 µm in width, lining the locule surface with regularly spaced and rounded papillae; papillae 9.5–18.8 µm (av. 12.7 µm) in diameter, 550 papillae per 0.25 mm 2.