Other common trees are Microphyllous garcinifolia , M . chrysophylloides , and Ocotea spathulata . The tabonuco forest type occupies the greatest land area in the Caribbean National Forest. Three tree strata are obvious a discontinuous upper strata, a second continuous strata at 20 meters and understory. The forest floor is only sparsely vegetated. Bromeliads, lianas, vines, and arborescent ferns are frequently observed.
Leaves are mesophyllous, and shade leaves, tend to be covered with epiphytic growth.
The R o Abajo Commonwealth Forest is found in the limestone hill region of northern Puerto Rico in the municipalities of Utuado and Arecibo. Here chupacallos is found in the semi-evergreen or evergreen seasonal forest of the subtropical moist forest life zone on limestone hills at elevations from 150 to 350 meters. Soils in these hills are shallow, well-drained, alkaline, and interspersed between outcrops of hard limestone. Mean annual precipitation varies from 150 to 200 centimeters. Two strata are present in this type of forest.