The
type specimen were collected on
Mount Pangerango, Java.
Peperomia pangerangoana is a
glabrous plant growing on mossy tree trunks, with a stem rooting at the base, hard and black when dry, 2 mm thick, angular, branched above; branchlets ribbed, 1 mm thick. The
leaves are alternate with short
petioles 3 mm long; the upper blade is elliptic or elliptic-lanceolate, acute at the base, obtuse at the apex; subsequent leaves are obovate from a cuneate base; all leaves are rigid when dry, minutely red-punctulate beneath, up to 19 mm long and 9–14 mm wide,
3-nerved. The
peduncles are axillary and terminal, up to 10 mm long, slightly longer than the leaf blade. The
spikes are sublaxly flowered, up to 22 mm long and 0.75 mm thick, rigid when dry. The
bract has a sub-obovate-round pelt, shortly pedicellate at the center, 0.75 mm long and up to 0.5 mm wide. The
ovary is ovate, immersed in the
rachis at the base, sprinkled with glands, bearing a
stigma obliquely just below the apex; the stigma is fleshy. The
berry is ovate, somewhat roughened with glands, nearly 1 mm long. ==Taxonomy and naming==