Trymatococcus
Description
Trees, monoecious. Leaves alternate and distichous; stipules semi-amplexicaul, free; blade entire, pinnately veined. Inflorescences in the leaf axils, bisexual, pedunculate, receptacle cylindrical to turbinate, bracteate. Staminate flowers a few to many, superficial, on the upper part of the receptacle; perianth 3-lobed to 3-parted; stamens 3; pistillode present. Pistillate flower 1, central, embedded in the receptacle; ovary adnate to the perianth; stigmas 2, filiform. Fruit forming a drupaceous whole with the perianth and the enlarged, fleshy, yellowish receptacle; seed large, without endosperm, cotyledons thick, equal or unequal.
Wood
Vessels diffuse, solitary (50-70%) and in short radial multiples of 2-4, round to oval, 7-9 per sq. mm, diameter 95-110 μm. Vessel-member length: 370-465 μm. Perforations simple. Intervascular pits alternate, round to oval, 7-11 μm. Pits between vessels and procumbent ray cells comparable with the intervascular pits in size; pits between the vessels and the upright ray cells and the vessel-parenchyma pits irregular, round to elongate, tending towards a scalariform pattern, half-bordered. Thin- walled tyloses often present.
Rays uniseriate and 2-4-seriate, 8-10 per mm, up to 300-900 μm high. Heterogeneous, composed of procumbent cells with uniseriate margins of 1-4 rows of square and upright cells. Radial latex tubes present in all samples. Rhombic crystals occasionally present in the marginal cells.
Parenchyma, often unilateral, narrowly aliform with long wings, occasionally confluent-banded, in some samples terminal parenchyma present. Strands of 2-4 cells.
Fibres non-septate, lumen 5-13 μm, walls 2-3 μm. Pits simple, small, confined to the radial walls. Few gelatinous fibres. Length: 1000-1200 μm. F/V ratio: 2.6-2.8.
Rays uniseriate and 2-4-seriate, 8-10 per mm, up to 300-900 μm high. Heterogeneous, composed of procumbent cells with uniseriate margins of 1-4 rows of square and upright cells. Radial latex tubes present in all samples. Rhombic crystals occasionally present in the marginal cells.
Parenchyma, often unilateral, narrowly aliform with long wings, occasionally confluent-banded, in some samples terminal parenchyma present. Strands of 2-4 cells.
Fibres non-septate, lumen 5-13 μm, walls 2-3 μm. Pits simple, small, confined to the radial walls. Few gelatinous fibres. Length: 1000-1200 μm. F/V ratio: 2.6-2.8.