Rhyticaryum novoguineense (Warb.) Sleumer

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 : 102

Rhyticaryum novoguineense (Warb.) Sleumer

Fig. 32.19–32.26

Material examined

Specimen used for endocarp and fruit description

PAPUA NEW GUINEA • 1968; A. Millar NGF 40764 ; L [ L.2293149 ] .

Description

FRUIT. Epicarp strigose, with yellow simple hairs with granular ornamentation; mesocarp 120–340 µm thick when dry. Length 17.0– 21.1 mm, width 13.2–15.0 mm, thickness 5.0– 9.2 mm.

ENDOCARP. Cream, length ca 19.8 mm, width 12.4–12.5 mm, thickness ca 8.7 mm. Keel surrounding the endocarp in the plane of symmetry, with a central channel. Apex slightly inflated and asymmetrical in lateral view; base rounded, symmetrical. Outer surface of the endocarp ridged, with 5–6 ridges longitudinally; the median ridge running from the base to the apex. Ridges rounded and thin, with a median channel, enclosing ca 22 polygonal areoles with small freely ending ridgelets. Endocarp possessing a symmetrical pair of pores positioned eccentrically and subapically on the median ridge. Primary vascular bundle positioned inside the channel on the keel. Endocarp wall 391–405 µm thick excluding ridges (624–654 µm thick including ridges). Endocarp wall structure unknown.

Remarks

The structure of the wall was crushed in the process of material preparation, rendering the anatomy unobservable (see Discussion for preservation issues).